Documents/API

This page describes an application programming interface (API) of OpenSCADA.

OpenSCADA is a project of the open SCADA-system based on the modular principle. The document contains exhaustive information of the internal architecture of the OpenSCADA objects. Additionally there is provided of information about the object's attributes and methods.

This document is intended for programmers wishing to understand the architecture of OpenSCADA and to develop extensions for it. The document is not intended mostly for users and integrators of OpenSCADA, although some things can be useful to them to understand the work.

For the possibility of understanding the document it is necessary for you to know the concept of Object Oriented Programming (OOP) and Universal Modelling Language (UML), and for the possibility of studying the source code of the project it is required the knowledge of the programming language C++. Additionally the document contains of mentioning of the following technologies: relational databases, XML.

1 Internal structure

For a visual and accessible understanding of the OpenSCADA architecture, Figure 1 shows a static diagram of the OpenSCADA classes in the Universal Modeling Language (UML).

It can be seen from the diagram that OpenSCADA contains modular subsystems: "Archives-History", "Databases", "Transports", "Transport protocols", "User Interfaces", "Data Acquisition" and "Special", as well as subsystems: "Security" and "Module's management". The diagram shows the relationships between modular subsystems and modules of the corresponding types.

Fig. 1. Static class diagram.

2 Overall structure of the program — modularity

The root, from which we construct the whole program, is the object #TSYS. The root contains subsystems #TSubSYS. The subsystems can be ordinary and modular. Difference the modular subsystems is clearly shown in Figure 1. Thus, modular subsystems necessarily contain a list of modular objects #TModule, for example, the archive-history subsystem #TArchiveS contains the modular objects #TTypeArchivator. Meanwhile, the normal subsystem does not contain such objects, for example, the security subsystem #TSecurity (Fig. 2).

Fig. 2. Hierarchical structure of OpenSCADA.

The root initialization process #TSYS defines a global variable "SYS" that can be used to directly access the root of the application from any of its nodes. The root initialisation is done once from the calling main function. After starting, control is captured by the root object of the program until it stops. The root object concentrates all the common functions of OpenSCADA.

The continuation of the root object #TSYS, which performs the functions of maintaining the flow of program messages, is the object #TMess, which is available through the global variable "Mess" initialised by the root of the program. The object contains functions of encoding, decoding and localisation of messages.

The subsystems #TSubSYS implement functions that are individual to each subsystem and with access common to all subsystems through the #TSubSYS object. The modular subsystem has the possibility of expanding functionality through modules, for which it provides access to modules of its type in the form of modular objects.

A module is a component of a modular subsystem. A module provides information about itself, its origin, and the functions it exports. A separate module implements functionality according to its own needs.

2.1 The root object system (TSYS)

Data:
Information variables of the program:

• PACKAGE_LICENSE — Distribution license of the program
• PACKAGE_DESCR — Brief description of the program
• PACKAGE_AUTHOR — Author of the program
• PACKAGE_SITE — Web site of the program support

Methods for coding of symbol sequences (enum — TSYS::Code):

• PathEl — element of the path (the characters: '/' and '%' to the form '%2f');
• HttpURL — address of the browser (http url);
• Html — special characters for use in html;
• JavaSc — end of line character for JavaScript;
• SQL — SQL-query value;
• Custom — selective coding of the specified characters;
• base64 — encoding in the standard Base64;
• FormatPrint — coding/masking of the formatting elements for functions like "printf";
• oscdID — coding of the nodes' identifiers;
• Bin — encoding of the binary data in text and vice versa;
• Reverse — invert the order of characters in the line;
• ToLower — convert to the lower case;
• ShieldSymb — shielding-encoding symbols with the slash symbol "\" and decoding their back to the real code;
• ShieldBin — shielding-encoding all binary symbols [\x0-\x8\xB-\xC\x0E-\x1F] with the slash symbol "\".

Types of representations of the integer in the function TSYS::int2str(), and TSYS::ll2str() (enum — TSYS::IntView):

• Dec — decimal;
• Oct — octal;
• Hex — hexadecimal.

Structure of redundant station (class — TSYS::SStat):

• int8_t lev; — station level;
• bool isLive; — flag "Station Alive";
• float cnt; — counter of requests to the remote station or timer of a re-connection try;
• ResMtx reqM; — the station requesting functional lock;
• SStat( int8_t ilev, bool iisLive = false, float icnt = 0 ) — station object constructor with level ilev, initiated as "Alive" iisLive and counter icnt;
• SStat( ) — constructor by default, initiated as as a missed and an inactive station;
• bool isActive( ) — station is active.

Structure of OpenSCADA task (class — TSYS::STask):

• STask( pthread_t ithr, char ipolicy, char iprior ); — constructor of the task's descriptor for thread ithr, it's scheduling policy ipolicy and priority iprior.
• float consumpt( ) const; — the task's last CPU time consumption, in seconds.
• float period( ); — the task's call instant periodicity, in seconds.
• string path; — path.
• pthread_t thr; — thread handler.
• uint8_t policy, phase; — scheduling policy and phase.
• int16_t prior; — scheduling priority.
• pid_t tid; — thread's identifier as a Linux process's ID.
• ResString cpuSet; — used processors/cores list.
• void *(*task) (void *); — pointer to the task.
• void *taskArg; — arguments of the task.
• unsigned flgs; — flags, "enum Flgs { Detached = 0x01, FinishTask = 0x02; }".
• int64_t tm_beg, tm_end, tm_per, tm_pnt, cycleLost, lagMax, consMax; — statistic variables of the task execution.

Templates/definitions:

• NSTR_BUF_LEN — Length of string buffers for numbers (50 symbols).
• CFG_A_LEN — Maximum attribute size of the configuration cell in XML (100 symbols).
• DAQ_APER_FRQ — Frequency of representing the aperiodic invokes, like to "f_start", of the periodic processes in Hz (1000000).
• RECURS_DET_HOPS — Hops/depth number of the recursion detection.
• ARCH_BUF — Name of requesting the messages buffer ("<buffer>").
• ARCH_ALRM — Name of requesting the actual alarms table ("<alarms>").
• ARCH_ALRM_CH — Name of requesting for records change of the the actual alarms table ("<alarmsChange>").
• ARCH_NOALRM — Name of requesting for the buffer and archivers and without the actual alarms table ("<noalarms>").
• DB_GEN — Code name of the Generic Storage ("<gen>").
• DB_CFG — Code name of the Configuration File ("<cfg>").
• DB_NULL — Mark of the DB NULL value ("<NULL>").
• __func__ — The full name of the calling function.
• vmin (a,b) — Determination of the minimum value.
• vmax (a,b) — Definition of the maximum value.

Public methods:

• TSYS( int argi, char **argb, char **env ); — The initialisation constructor.
• bool isRunning( ); — Sign of the station running state — executing the main threaded module or waiting the stop signal.
• bool isFinalKill( ); — Sign "The final killing of". It is used for forced disconnection of blocked objects on the the final stage of shutdown.
• int stopSignal( ); — The return code in the case of system shutdown. Can be used as a sign of "System shutdown" of the various subsystems.
• void unload( ); — Unload subsystems.
• int start( ); — Start of the system. The function is finished only with the finishing of the system. The return code is returned.
• void stop( int sig = SIGUSR1 ); — Stop program by the signal sig, by default it is SIGUSR1 and SIGUSR2 reserved for projects manager.
• string id( ) const; — station ID.
• string name( ) const; — Localized name of the station.
• void setName( const string &vl ); — Setting the localized name of the station.
• string ico( string *tp = NULL, bool retPath = false ); — Obtaining file data or path, for retPath, of the station common icon with placing the file type to tp.
• string user( ) const; — The system user on behalf of which the system is running.
• string host( ); — Host name for the station run.
• void list( vector<string> &list ) const; — A list of registered subsystems in the system.
• bool present( const string &name ) const; — Check the availability of the subsystem.
• void add( TSubSYS *sub ); — Add/registration of the subsystem.
• void del( const string &name ); — Removing the subsystem.
• AutoHD<TSubSYS> at( const string &name ) const; — Connection to the specified subsystem.
• AutoHD<TUIS> ui( ); — Direct access to the subsystem "User interfaces".
• AutoHD<TArchiveS> archive( ); — Direct access to the subsystem "Archives".
• AutoHD<TBDS> db( ); — Direct access to the subsystem "Databases".
• AutoHD<TControllerS> daq( ); — Direct access to the subsystem "Data acquisition".
• AutoHD<TProtocolS> protocol( ); — Direct access to the subsystem "Protocols".
• AutoHD<TTransportS> transport( ); — Direct access to the subsystem "Transports".
• AutoHD<TSpecialS> special( ); — Direct access to the subsystem "Special".
• AutoHD<TModSchedul> modSchedul( ); — Direct access to the subsystem "Module".
• AutoHD<TSesurity> sesurity( ); — Direct access to the subsystem "Security".
• string workDir( ); — Working directory of the station.
• string modDir( ); — Directories with the modules of OpenSCADA, separated by ';', they can include a files' template into the end (/my/modules/path/lib*.so).
• string icoDir( ); — Directory of the icons of OpenSCADA.
• string docDir( ); — Directory of the documents of OpenSCADA.
• void setWorkDir( const string &wdir, bool init = false ); — Setting the working directory of the station.
• void setModDir( const string &mdir, bool init = false ); — Specifying the directories of the modules of OpenSCADA.
• void setIcoDir( const string &idir ); — Specifying of the directory of icons of OpenSCADA.
• void setDocDir( const string &idir ); — Specifying of the directory of documents of OpenSCADA.
• string cfgFile( ); — Name of configuration file of the system.
• XMLNode &cfgRoot( ); — Parsed structure of the configuration file.
• XMLNode *cfgNode( const string &path, bool create = false ); — Node of configuration getting by it path path. Elements of the path creation by it miss create.
• void modifCfg( bool chkPossibleWR = false ); — Configuration mark to modification or write possibility chkPossibleWR, for next saving to file.
• ResRW &cfgRes( ); — Lock of the access to the config file tree.
• string workDB( ); — The full name of the working database.
• string mainCPUs( ); — Used processors list.
• bool clockRT( ); — The Real-time clock selection for the tasks planning, else used the monotonic one (by defaults).
• int taskInvPhs( ); — Number of the tasks invoking phases.
• bool saveAtExit( ); — Sign - "Save configuration on exit".
• int savePeriod( ); — Frequency of the automatically saving the station in the database (seconds).
• bool modifCalc( ); — Set modification for the calculated objects.
• void setSelDB( const string &vl ); — Installation of the selected database for the specified boot.
• void setMainCPUs( const string &vl ); — Setting of used processors list.
• void setClockRT( bool vl ); — Setting of the Real-time clock selection for the tasks planning.
• void setTaskInvPhs( int vl ); — Setting number of the tasks invoking phases.
• void setSaveAtExit( bool vl ); — Setting of the sign - "Save configuration on exit".
• void setSavePeriod( int vl ); — Set the frequency of the automatically saving of the station to the database (seconds).
• void setModifCalc( bool vl ); — Set of setting the modification for the calculated objects.
• string selDB( ); — Chosen DB. Used for selective loading from the specified database in the subsystem "DB".
• void setWorkDB( const string &wdb ); — Setting of the full name of the working database.
• bool chkSelDB( const string &wDB ); — The function of checking for compliance of the specified database wDB with the selected "selDB()".
• XMLNode *cfgCtx( bool last = false ); — The global configuration context of the interstation copying or the last setting link, for the access lock used cfgLoadSaveM().
• void setCfgCtx( XMLNode *vl, bool last = false ); — Set the global configuration context of the interstation copying or the last setting link, for the access lock used cfgLoadSaveM(). At any operation with the global configuration context the last setting link is cleared.
• ResMtx &cfgLoadSaveM( ); — Lock of the loading and saving configuration.
• static void sighandler( int signal ); — Function of the default handler of the signals of the system as a whole.
• float sysClk( ); void setSysClk( float vl ); — System clock-frequency in MHz and its setting from outside for information on the root page.
• void taskCreate( const string &path, int priority, void *(*start_routine)(void *), void *arg, int wtm = 5, pthread_attr_t *pAttr = NULL, bool *startSt = NULL ); — Create task (thread) with id path, priority (-1...99), task's function start_routine and it argument arg, and also wait for user's code start by flag startSt.
• void taskDestroy( const string &path, bool *endrunCntr = NULL, int wtm = 5, bool noSignal = false ); — Destroy task with id path, start control flag startCntr. Use noSignal for exclude signal SIGALRM send to the task.
• void taskSendSIGALRM( const string &path ); — Sending the termination signal "ALARM" to a task with id path.
• double taskUtilizTm( const string &path, bool max = false ); — Utilization of CPU time, in seconds, for task path or it's maximum max.
• static bool taskEndRun( ); — Check for the task endrun by signal SIGUSR1.
• static const STask& taskDescr( ); — Get reference to the task's descriptor.
• static int sysSleep( float tm ); — System sleep in seconds up to nanoseconds (1e-9).
• time_t sysTm( ); time_t sysTmJmp( bool *hasJump = NULL, time_t last = 0 ); — System time fast access from updating cell and with a function of detection time jumps hasJump from last used time.
• static int64_t curTime( clockid_t clc = CLOCK_REALTIME ); — The clock clc time in microseconds from the beginning of the era (01.01.1970).
• static uint64_t curTimeN( clockid_t clc = CLOCK_REALTIME ); — The clock clc time in nanoseconds from the beginning of the era (01.01.1970).
• string prjUserDir( ); — Directory of the user projects.
• bool prjCustMode( ); — Custom mode of projects.
• void setPrjCustMode( bool vl ); — Set for custom mode of projects.
• string prjNm( ); — Project name of the configuration.
• void setPrjNm( const string &vl ); — Set project name of the configuration.
• bool prjSwitch( const string &prj, bool toCreate = false ); — Switch to project prj.
• int prjLockUpdPer( ); — Get project lock updating period, zero for the lock disable.
• bool prjLock( const char *cmd ); — Project lock process for the command cmd ("hold", "free", "update").
• static void taskSleep( int64_t per, const string &cron = "", int64_t *lag = NULL ); — The function of the flow sleep by the grid of absolute time with the period per in the nanosecond or for the scheduled time cron. If set lag then to it will return different value from real and planed wake up time (lost cycles).
• static time_t cron( const string &vl, time_t base=0 ); — Planning the execution time on the format of the standard Cron vl beginning at the basic time base or at the current time if the base is not specified.
• static bool eventWait( bool &m_mess_r_stat, bool exempl, const string &loc, time_t time=0 ); — Function of the event waiting exempl for the variable m_mess_r_stat within a specified time interval time for the source loc.
• bool cntrEmpty( ); — Debug counters checking to empty.
• double cntrGet( const string &id ); — Debug counter id getting.
• void cntrSet( const string &id, double vl ); — Debug counter id setting to value vl.
• void cntrIter( const string &id, double vl ); — Debug counter id iteration to value vl.
• bool rdEnable( ); — Redundancy enabled, at least one redundancy station presented.
• bool rdActive( ); — Redundancy active, at least one active station presented.
• void rdStList( vector<string> &ls ); — List of ls stations into the redundancy.
• SStat rdSt( const string &id ); — Get copy of state structure of the redundancy station id.
• map<string, SStat> rdSts( ); — Get copy of list of state structures of redundancy stations.
• int rdStLevel( ); — Current station level into the redundancy system.
• void setRdStLevel( int vl ); — Set current station level into the redundancy system.
• float rdTaskPer( ); — Period of execution of the redundancy processing task.
• void setRdTaskPer( float vl ); — Set period of execution of the redundancy processing task.
• int rdRestConnTm( ); — Time of the retry attempts to reconnect to the backup station after its loss in seconds.
• void setRdRestConnTm( int vl ); — Set time of the retry attempts to reconnect to the backup station after its loss in seconds.
• string rdStRequest( XMLNode &req, const string &st = "" ); — Common request req to pointed redundancy station st.
• static string int2str( int val, IntView view=Dec ); — Transformation of a signed integer to the string of the type of view view.
• static string uint2str( unsigned val, IntView view=Dec ); — Transformation of unsigned integer to the string type of view view.
• static string ll2str( long long val, IntView view=Dec ); — Transformation of a long integer (64bit) to the string type of view view.
• static string real2str( double val, int prec=15, char tp='g'); — Real transformation with an accuracy prec signs and type tp to the string.
• static double realRound( double val, int dig=0, bool toint=false ); — Rounding the real number to the specified digit dig after the decimal point with the possibility of transformation to integer after rounding toint.
• static string atime2str( time_t tm, const string &format = "", bool gmt = false, const string &user_lang = "" ); — Astronomic UNIX time tm conversion to string in the format of the POSIX-function "strftime()" or "gmtime()" for gmt, also can be localised for the user and language user_lang or from the messages translation context.
• static string time2str( double tm ); — Convert time interval, in seconds, to string like "1hour 23min 10sec".
• static string cpct2str( double cnt ); — Traffic counter cnt (bytes) convert to string like "12.5KiB".
• static double str2real( const string &val ); — String transformation to the real.
• static time_t str2atime( const string &val, const string &format = "", bool gmt = false ) — String time val conversion to an astronomic UNIX time, in the format of the POSIX-function "strptime()", and by the function "mktime()" or "timegm()", for gmt.
• static string addr2str( void *addr ); — Convert addresses into string.
• static void *str2addr( const string &str ); — Convert string into the address.
• static string strTrim( const string &val, const string &cfg = " \n\t\r" ); — Deletes from the original string val pointed into cfg (mostly empty) characters at the beginning and end of it.
• static string strSepParse( const string &path, int level, char sep, int *off = NULL ); — Parsing of the string path into the components separated by the dividing symbol sep, beginning with the offset off and controlling the offset of the element end in itself.
• static string {strParse,strParseEnd}( const string &str, int level, const string &sep, int *off = NULL, bool mergeSepSymb = false ); — Parse function's "strSepParse()" expanded version which allow using multi-symbols separators and one symbol merging. strParseEnd does the same but from the end.
• static string strLine( const string &str, int level, int *off = NULL ); — Parsing text lines for different ways to the end of a line (CR, LF and CR/LF).
• static string pathLev( const string &path, int level, bool decode = true, int *offCmtbl = NULL, int *off = NULL ); — Obtaining of the element/token level of the path with the ability of their decode, starting with the offset off (stopping on the next token begin) or offCmtbl (stopping on next symbol of the current token end — for compatibility).
• static string pathLevEnd( const string &path, int level, bool decode = true, int *off = NULL ); — Obtaining of the element/token level of the path from the end with the ability of their decode, starting with the offset off (stopping on the next token end).
• static string path2sepstr( const string &path, char sep = '.' ); — Transformation the path into string with the separator sep of the elements.
• static string sepstr2path( const string &str, char sep = '.' ); — Transformation of the string with the separator sep of the elements into the path.
• static string strEncode( const string &in, Code tp, const string &opt = "" ); — Encoding of the string by the specified rule tp and the option opt (symbols by "Custom").
• static string strDecode( const string &in, Code tp = Custom, const string &opt = "" ); — Decoding of the string in by the specified rule tp and the option opt (separator or "<text>" for "Bin").
• static string strMess( const char *fmt, ... ); — Formation of the string by the template fmt and arguments. It is implemented on the basis of "printf".
• static string strLabEnum( const string &base, bool onlyDec = true ); — Individual string labels from base forming by increment at end. Supported numbering into decimal, hexadecimal (prefix "0x") or octal (prefix "0") notation and onlyDec for simple enumerating one digit, found the first from the string end.
• string strCompr( const string &in, int lev=-1); — Compression of the string in with the compression level lev.
• string strUncompr( const string &in ); — Decompression of the string in.
• static inline uint16_t getUnalign16( const void *p ); static inline uint32_t getUnalign32( const void *p ); static inline uint64_t getUnalign64( const void *p ); — Unaligned read for unsigned
• static inline int getUnalignInt( const void *p ); — Unaligned read for integer from buffer by offset.
• static inline float getUnalignFloat( const void *p ); — Unaligned read by real "float" from buffer by offset.
• static inline double getUnalignDbl( const void *p ); — Unaligned read by real "double" from buffer by offset.
• static uint16_t i16_LE( uint16_t in ); static uint32_t i32_LE( uint32_t in ); static uint64_t i64_LE( uint64_t in ); — Byte order conversion for integer in from Little-Endian (LE) to internal represent.
• static uint16_t i16_BE( uint16_t in ); static uint32_t i32_BE( uint32_t in ); static uint64_t i64_BE( uint64_t in ); —Byte order conversion for integer in from Big-Endian (BE) to internal represent.
• static float floatLE( float in ); static double doubleLE( double in ); — Real number in conversion from internal to format IEEE754 Little-Endian (LE).
• static float floatLErev( float in ); static double doubleLErev( double in ); — Real number in conversion from format IEEE754 Little-Endian (LE) to internal.
• static float floatBE( float in ); static double doubleBE( double in ); — Real number in conversion from internal to format IEEE754 Big-Endian (BE).
• static float floatBErev( float in ); static double doubleBErev( double in ); — Real number in conversion from format IEEE754 Big-Endian (BE) to internal.
• string optDescr( ); — Full localized help on the options of the command line and parameters of the configuration file.
• string getCmdOpt( int &curPos, string *argVal = NULL ); static string getCmdOpt_( int &curPos, string *argVal, int argc, char **argv ); — Command line parameters parsing by cursor scanning curPos. Return argument name and it's possible value into argVal. Implement formats for short keys: "-v", "-v val", "-abcv", "-abcv val"; and long keys: "--var", "--var=val", "--var val".
• bool cmdOptPresent( const string &opt ); — Check the command-line option opt for presence.
• string cmdOpt( const string &opt, const string &setVl = "" ); — Get command-line option opt. Set it at setVl if pointing.
• int permCrtFiles( bool exec = false ); — get permission for files created OpenSCADA in form 0777 (RWXRWXRWX), where exec is not mask the bit 01.
• ResMtx *commonLock( const string &nm ); — creates and gets a lock for the name nm — for non multithread system functions, typically.
• static void ctrListFS( XMLNode *nd, const string &fsBase, const string &fileExt = "" ); — Browsing list for file system's items from base fsBase, for the files with extensions fileExt in list "png;jpeg;gif;".

Public attributes:

• AutoHD<TModule> mainThr; — Connection to a module executing in the main thread.
• unsigned f_useEnv :1; — Use environment variable OSCADA_{cmd} for default commadline options and generic parameters, sets itself by OSCADA_CMD_EN.

Short calls for global functions into "OSCADA" namespace:

• template <class fVal> fVal fmin( fVal a, fVal b ); template <class fVal> fVal fmax( fVal a, fVal b ); — functional templates for obtain of two values minimum and maximum.
• inline string i2s( int val, TSYS::IntView view = TSYS::Dec ) —> TSYS::int2str(val, view);
• inline string u2s( unsigned val, TSYS::IntView view = TSYS::Dec ) —> TSYS::uint2str(val, view);
• inline string ll2s( long long val, TSYS::IntView view = TSYS::Dec ) —> TSYS::ll2str(val, view);
• inline string r2s( double val, int prec = 15, char tp = 'g' ) —> TSYS::real2str(val, prec, tp);
• inline double rRnd( double val, int dig = 0, bool toint = false ) —> TSYS::realRound(val, dig, toint);
• inline string atm2s( time_t tm, const string &format = "", bool gmt = false ) —> TSYS::atime2str(tm, format, gmt);
• inline string tm2s( double tm ) —> TSYS::time2str(tm);
• inline int s2i( const string &val ) —> atoi(val.c_str());
• inline long s2l( const string &val, int base = 10 ) —> strtol(val.c_str(), NULL, base);
• inline unsigned long s2u( const string &val, int base = 10 ) —> strtoul(val.c_str(), NULL, base);
• inline long long s2ll( const string &val ) —> atoll(val.c_str());
• inline double s2r( const string &val ) — TSYS::str2real(val);
• inline string sTrm( const string &val, const string &cfg = " \n\t\r") —> TSYS::strTrim(val, cfg);

2.2 Object of the messages system (TMess)

Data:
Types (levels) of messages (enum — TMess::Type):

• Debug (0) — debug;
• Info (1) — information;
• Notice (2) — the notification;
• Warning (3) — warning;
• Error (4) — error;
• Crit (5) — critical situation;
• Alert (6) — alert;
• Emerg (7) — emergency;
• MaxLev (79) — maximum message level, where [0...7] are the generic named levels and the second digit is them sub-levels.

Direction for the messages (enum — TMess::Direct):

• DIR_SYSLOG (0x1) — to SYSLOG;
• DIR_STDOUT (0x2) — to standard output;
• DIR_STDERR (0x4) — to standard errors output;
• DIR_ARCHIVE (0x8) — to messages archive.

The structure of the message (class — TMess::SRec):

• SRec( ); SRec( time_t itm, int iutime = 0, const string &icat = "", int8_t ilev = 0, const string &imess = "" ); — the class constructors;
• bool operator==( SRec &vl ); — the object comparing;
• time_t time; — time of the message;
• int utime; — microsecond of the message time;
• string categ; — category of messages (usually the way inside the system);
• int8_t level; — the level of the message;
• string mess; — message.

Templates:

• _(mess); trS(mess) — Wrappers over the translation of the messages function for the provision of the accepted by the most of the programs translation of the messages. trS() also provides the prestoring, when the base message stored together the catalogue, that is "{base}\000{cat}" and what is translated really in second call inward the translation context or _().
• trD(base) — Wrapper over the text variables dynamic translation using the translation context to the function translGet().
• trD_L(base,lng); trD_U(base,usr); trD_LU(base,lng,usr) — Wrappers over the text variables dynamic translation functions by language and user.
• trDSet(base,mess) — Wrapper over the text variables dynamic translation set using the translation context to the function translSet().
• trDSet_L(base,lng,mess); trDSet_U(base,usr,mess); trDSet_LU(base,lng,usr,mess) — Wrapper over the text variables dynamic translation set functions by language and user.
• FTM(rec); FTM2(tm, utm) — Get a full time of the message, in microseconds, using the two fields of time of the message structure.
• mess_lev() — The system's messages level. Often used for debug mode check (=Debug).
• message( cat, lev, fmt, args ... ) — Formation of the the full message.
• mess_debug( cat, fmt, args ... ) — Formation of the debug message.
• mess_info( cat, fmt, args ... ) — Formation of the information message.
• mess_note( cat, fmt, args ... ) — Formations of the message - notification.
• mess_warning( cat, fmt, args ... ) — Formation of the warning message.
• mess_err( cat, fmt, args ... ) — Formation of the error message.
• mess_crit( cat, fmt, args ... ) — Formation of the critical condition message.
• mess_alert( cat, fmt, args ... ) — Formation of the alarm message.
• mess_emerg( cat, fmt, args ... ) — Formation of the emergency message.
• message_( cat, lev, fmt, args ... ) — Formation of the the full message (selected level and debug categories are ignored).
• mess_debug_( cat, fmt, args ... ) — Formation of the debug message (selected level and debug categories are ignored).
• mess_info_( cat, fmt, args ... ) — Formation of the information message (selected level is ignored).
• mess_note_( cat, fmt, args ... ) — Formations of the message - notification (selected level is ignored).
• mess_warning_( cat, fmt, args ... ) — Formation of the warning message (selected level is ignored).
• mess_err_( cat, fmt, args ... ) — Formation of the error message (selected level is ignored).
• mess_crit_( cat, fmt, args ... ) — Formation of the critical condition message (selected level is ignored).
• mess_alert_( cat, fmt, args ... ) — Formation of the alarm message (selected level is ignored).
• mess_emerg_( cat, fmt, args ... ) — Formation of the emergency message (selected level is ignored).

Public methods:

• void load( ); — Download.
• void save( ); — Saving.
• string codeConv( const string &fromCH, const string &toCH, const string &mess); — Conversion of the codepage of the messages.
• string codeConvIn( const string &fromCH, const string &mess); — Conversion the codepage of the messages into the internal system codepage.
• string codeConvOut ( const string &toCH, const string &mess); — Conversion of the message from the internal system codepage.
• string I18N( const string &mess, const char *mLang = NULL, const char *d_name = NULL ); — Getting the message mess in the language mLang for the system translation from the directory d_name, NULL for the OpenSCADA core.
• string lang( ); — Language of the system, as en_US.UTF-8.
• string langCode( const string &user = "", bool onlyUser = false ); — Language code of the system. Specify user for obtaining its language and onlyUser for only that.
• string &charset( ); — The system codepage.
• int logDirect( ); — Receivers to whom the system messages (stdout, stderr, syslog, archive) are sent.
• int messLevel( ); — The level below which the messages are ignored.
• static bool messLevelTest( int8_t condLev, int8_t messLev ); — The message level testing for messLev >= condLev counting the message sub-levels — the second digit, where condLev is ±[0...7] and messLev is ±[0...79].
• string selDebCats( ); — Selected debug categories (by separated ';' list).
• bool isUTF8( ); — Internal codepage is UTF-8.
• void setLang( const string &lang ); — Setting of the system language (localization).
• void setLogDirect( int dir ); — Setting receivers to which the system messages are sent. For dir the bit mask is used. Where:

1 — to syslog;

2 — to stdout;

4 — to stderr;

8 — to the archive.

• void setMessLevel( int level ); — Setting a minimum level of processed messages.
• void setSelDebCats( const string &vl ); — Debug categories set (by separated ';' list).
• void put( const char *categ, int8_t level, const char *fmt, ... ); — The message forming for the current time with the category categ, the level, the formatted message fmt and the followed arguments.
• void put_( const char *categ, int8_t level, const char *fmt, ... ); void putArg( const char *categ, int8_t level, const char *fmt, va_list ap ); — The message forming for the current time (selected level and debug categories are ignored) with the category categ, the level, the formatted message fmt and the followed arguments.
• void get( time_t b_tm, time_t e_tm, vector<TMess::SRec> &recs, const string &category = "", int8_t level = Debug ); — Get the message from the archive for the period of time b_tm — e_tm under the category template category and minimum level level.
• string langCodeBase( ); — The language of basic variables of the text messages.
• string langBase( ); — The language-locale of basic variables and the locales list used in the project translation, separated by ';'.
• string langToLocale( const string &lang ); — Getting the complete locale from langBase() at the language lang.
• bool translCfg( ); — The configuration translation sign, combined as "langCodeBase().size() && langCode() != langCodeBase()".
• bool translDyn( bool plan = false ); — Mode "Dynamic translation" or the plan to next start.
• bool translEnMan( ); — The sign "Enabled translations manager", for activation of the built translation messages index and the translation manager.
• string translLangs( ); — List of translation languages, into the manager.
• string translFld( const string &lng, const string &fld, bool isCfg = false ); — Representing the translated field name by the field name fld and language lng for configuration isCfg or DB.
• bool isMessTranslable( const string &vl ); — Checking the message vl for availability of it translation, has no only space, digit and punctuation symbols.
• void setLangBase( const string &vl ); — Setting the language-locale of basic variables and the locales list used in the project translation.
• void setTranslDyn( bool val, bool plan = true ); — Setting the mode "Dynamic translation" or the plan to value val for next start.
• void setTranslEnMan( bool vl, bool passive = false ); — Setting "Enabled translation manager" to value vl and passive mode passive.
• void setTranslLangs( const string &vl ); — Setting a list of translation languages.
• string translGet( const string &base ); — Getting translation for base text variable using the translation context.
• string translGet( const string &base, const string &lang, const string &src = "" ); string translGetU( const string &base, const string &user, const string &src = "" ); string translGetLU( const string &base, const string &lang, const string &user, const string &src = "" ); — Getting translation for base text variable for language lang or user and optional source src.
• string translSet( const string &base, const string &mess ); — Setting translation for base text variable to value mess using the translation context.
• string translSet( const string &base, const string &lang, const string &mess, bool *needReload = NULL ); string translSetU( const string &base, const string &user, const string &mess, bool *needReload = NULL ); string translSetLU( const string &base, const string &lang, const string &user, const string &mess, bool *needReload = NULL ); — Setting translation for base text variable for language lang or user and optional source src to value mess.
• void translReg( const string &mess, const string &src, const string &prms = "" ); — Registering the translated message mess with source src and appended parameters prms into the translations index.
• string translCacheGet( const string &key, bool *ok = NULL ); — Getting the translation message at the key in the form "{lang}#{base}[\000{cat}]" from the translation cache. Where cat' can be: EMPTY — for dynamic messages, "sys" — for system messages and "user" — for the users used in the dynamic language obtaining. You can pass ok for detection the message really placing in the cache.
• void translCacheSet( const string &key, const string &val ); — Setting the translation message val at the key to the translation cache.
• void translCacheLimits( time_t tmLim = 0, const char *clrCat = NULL ); — Processing the translation cache limits at the size trMessCache and the nonzero time tmLim. Also that can clear the messages in the category clrCat.
• void translIdxCacheUpd( const string &base, const string &lang, const string &mess, const string &src ); — Updating the operative translation messages' index and cache in the MULTILANGUAGE-DYNAMIC mode.
• bool translItSplit( const string &base, const string &srcFltr = "" ); — Splitting the BASE message base per it sources and only for matched ones to srcFltr.
• bool translItRemTrs( const string &base, const string &srcFltr = "" ); — Removing the BASE message base from the individual messages table "Trs" and only for matched sources to srcFltr.
• string trCtx( const string &user_lang = mess_TrModifMark, bool *hold = NULL ); — Getting (by default) and registering(no empty)/clearing(empty) the translation context user_lang bound to the call pthread. hold can be pointed to detect the context already registered and do not clear that.
• static string labStorFromCode( const string &code ); static string labStor( ); static string labStorRem( const string &cnt ); static string labSecCRON( ); static string labSecCRONsel( ); static string labTaskPrior( ); static string labMessCat( ); static string labStdOutTrs( ); — Common help labels.
• int getUTF8( const string &str, int off = 0, int32_t *symb = NULL ); — Get and parse a UTF-8 symbol.
• static string setUTF8( int32_t symb ); — Set, form and return a UTF-8 symbol from their code symb.

2.3 Object subsystem (TSubSYS)

Public methods:

• TSubSYS( const string &id, bool mod = false ); — Initialize the constructor. Sign mod indicates that subsystem is module one.
• string subId( ) const; — ID of the subsystem.
• virtual string subName( ); — Localized name of the subsystem.
• bool subStartStat( ); — Sign of the subsystem execution.
• bool subModule( ) const; — Sign of the modularity of the subsystem.
• virtual int subVer( ) const; — Version of the subsystems.
• virtual void subStart( ); — Start of the the subsystem.
• virtual void subStop( ); — Stop of the subsystem.
• void modList( vector <string> &list ); — List list of the modules of the modular subsystem.
• bool modPresent( const string &name ); — Check for the availability of the module name.
• void modAdd( TModule *modul ); — Add/registration of the module modul.
• void modDel( const string &name ); — Deleting of the module name.
• AutoHD <TModule> modAt( const string &name ) const; — Connection to the module name.
• virtual void perSYSCall( unsigned int cnt ); — Periodic call from system thread, with period 10 seconds and seconds counter cnt.
• virtual bool rdProcess( XMLNode *reqSt = NULL ); — Processing of redundancy of the subsystem, calls from the system's task of redundancy. reqSt pass a result of a state request to the redundancy station for this subsystem.
• virtual string optDescr( ); — Localized help on the options of the command line and parameters of the configuration file for the whole subsystem, includes its modules.
• TSYS &owner( ) const; — The system - the owner of the subsystem.

2.4 Object Module (TModule)

Data:
The data structure which identifies the module (class — TModule::SAt):

• SAt( const string &iid, const string &itype = "", int itver = 0 ); — initialize the constructor;
• bool operator ==(const TModule::SAt &amst ) const; — comparison function identifiers modules;
• string id; — the identifier of the module;
• string type; — the type of module (subsystem);
• int tVer; — version of the type of module (subsystem) to which the module is designed.

The structure of exported functions (class — TModule::ExpFunc):

• string prot; — a prototype of the function;
• string dscr; — localized description of the function;
• void (TModule::*ptr) (); — relative address of the function (with respect to the object module).

Public methods:

• TModule( const string &id ); — Initialize the constructor of module id.
• string modId( ); — ID of the module.
• string modName( ); — Localized name of the module.
• virtual void modStart( ); — Start of the module.
• virtual void modStop( ); — Stop of the module.
• virtual void modInfo( vector<string> &list ); — A list of information items list of the module.
• virtual string modInfo (const string &name ); — Getting the contents of the specified information item name. For get the item on different language, at [../ProgrammManual#h932-1 dynamic messages translation], you can set the name in way "{Name}:{lang}".
• virtual void perSYSCall( unsigned int cnt ); — Periodic call from system thread, with period 10 seconds and seconds counter cnt.
• void modFuncList( vector<string> &list ); — The list of exported functions list of the module.
• bool modFuncPresent( const string &prot ); — Check the availability of the specified function by its prototype prot.
• ExpFunc &modFunc (const string & prot); — Get the information about exported function of the module prot.
• bool modFunc( const string &prot, void (TModule::**offptr)(), bool noex = false ); — Getting the relative address offptr of the exported function prot. Returns TRUE for successful and the non-exceptional mode noex.
• string I18N( const string &mess, const char *mLang = NULL ); — Localisation of modular message mess in accordance with the current locale and user language mLang in the MULTILANGUAGE modes.
• virtual string optDescr( ); — Localized help on the options of the command line and parameters of the configuration file for the module.
• TSubSYS &owner( ) const; — Subsystem - the owner of the module.

Protected Attributes:

• string mModName; — Name of the module.
• string mModDescr; — Description of the module.
• string mModType; — Type of module.
• string mModVers; — Version of the module.
• string mModAutor; — Author of the module.
• string mModLicense; — License of the module.
• string mModSource; — Source/origin of the module.

Protected methods are:

• void modInfoMainSet( const string &name, const string &type, const string &vers, const string &author, const string &descr, const string &license, const string &source ); — Main module information set.
• void modFuncReg (ExpFunc * func); — Registration of the exported by module functions.

3 Subsystem "DB"

Subsystem "Databases" is represented by the object TBDS, which contains a modular objects of the following types of DB TTypeBD. Each type of database contains objects of individual databases of that type TBD. Each database in its turn, contains the objects of their tables TTable (Fig. 3).

Fig. 3. Hierarchical structure of the subsystem "DB".

The subsystem provides the basic functions to access the type of database, as well as generalized functions for the manipulation of the databases and tables. For example, to hide the source of data, which may be a configuration file, the functions of an abstract access to the data source are provided. For the storage system-wide data the system table and the function of the abstract to access it are provided. Consequently, system-wide data can be stored in the configuration file and in the database table. More about the data organisation conception you can read in the Data in OpenSCADA and their storage section.

Being a modular object, the type of database (TTypeBD) provides access to the implementation of the mechanism of one or another database. Access is made through a public databases of the module of a given type of database. Open/registered database is described in the table of databases to be opened or in the configuration file. There is, the so-called, the working database, which is always opens and is shown in the configuration file. DB which support the SQL-queries can grant access based on direct SQL-queries.

While working, the components of OpenSCADA open tables (TTable) available in the database and work with them.

3.1 Object of subsystem "Database" (TBDS)

Data:
Flags of the function dbList() (enum – TDBS::DBLsFlg):

• LsNoFlg (0) — no list flag;
• LsCheckSel (0x01) — points to the necessity of verifying the fact of boot from the selected database and to insert to the db list the only selected one;
• LsInclGenFirst (0x02) — include the Generic Storage ("<gen>") in the first.

Flags of the queries to the storage (enum – TDBS::ReqGenFlg):

• NoFlg (0) — no query flag;
• NoException (0x01) — do not generate the exceptions, return error result;
• OnlyCfg (0x02) — force request to the configuration file, in genPrmGet(), genPrmSet() and dataSet() only;

Specific flags

• UseTranslation (0x04) — use the translation of the text variable, in genPrmGet() and genPrmSet() only;
• UseCache (0x04) — use the cache, in dataSeek() only, defines the seek cache using — preloading the result in whole and significant acceleration, as the unique cacheKey this function uses the cfg address.
• UseAllKeys (0x04) — use all keys, in dataDel() only, is used to indicate the necessity of the all keys set fro their using while deleting with the restoration of the original state of the keys selection when the function is finished. If this flag is not set, the early selected keys are used to perform the operation.

Public generic static methods:

• static string fullDBSYS( ); — The full name of the system table.
• static string fullDB( ); — The full name of the table with a description of the registered databases.
• static string realDBName( const string &bdn, bool back = false ); — Conversion of the full template name of the database or table (of view "<gen>.myTbl") in the real name. Use back for the backward conversion.
• static string dbPart( const string &bdn, bool tbl = false ); — Getting the generic storage address part or the table at tbl from the common storage name bdn.
• static void dbList( vector<string> &ls, char flags = LsNoFlg ); — List of available databases with the DBLsFlg flags.
• static AutoHD<TTable> tblOpen( const string &bdn, bool create = false ); — Opening the table bdn of the storage by it full path with the creation create at absence.
• static void tblClose( const string &bdn, bool del = false ); — Closing the table bdn of the storage by it full path with deleting at del.
• static bool dataSeek( const string &bdn, const string &path, int lev, TConfig &cfg, char flags = NoFlg, XMLNode *localCfgCtx = NULL ); — Complete scanning of the records on the storage according to the ReqGenFlg flags. If the DB name bdn or path path to the Configuration File are not pointed, their processing is skipped. More about conditions of using the Configuration File and the Data Bases read in the Data storing conception. localCfgCtx is used for loading from the local configuration context, prepared in dataSet(), and it missing causes for checking and using, at presence, the global configuration context SYS->cfgCtx().
• static bool dataGet( const string &bdn, const string &path, TConfig &cfg, char flags = NoFlg, XMLNode *localCfgCtx = NULL ); — Getting the record from the storage according to the ReqGenFlg flags. If the DB name bdn or path path to the configuration file are not pointed, their processing is skipped. More about conditions of using the Configuration File and the Data Bases read in the Data storing conception. localCfgCtx is used for loading from the local configuration context, prepared in dataSet(), and it missing causes for checking and using, at presence, the global configuration context SYS->cfgCtx().
• static bool dataSet( const string &bdn, const string &path, TConfig &cfg, char flags = NoFlg, XMLNode *localCfgCtx = NULL ); — Setting/Saving the record to the storage according to the ReqGenFlg flags. If the DB name bdn or path path to the configuration file are not pointed, their processing is skipped. More about conditions of using the Configuration File and the Data Bases read in the Data storing conception. localCfgCtx is used for saving to the local configuration context, is prepared for dataSeek() and dataGet(), and it missing causes for checking and using, at presence, the global configuration context SYS->cfgCtx().
• static bool dataDel( const string &bdn, const string &path, TConfig &cfg, char flags = NoFlg ); — Deleting the record in the storage according to the ReqGenFlg flags. If the DB name bdn or path path to the configuration file are not pointed, their processing is skipped. More about conditions of using the Configuration File and the Data Bases read in the Data storing conception.
• static bool dataDelTbl( const string &bdn, const string &path = "", char flags = NoFlg ); — The data container table common removing from the storage bbn and the configuration file path, according to the ReqGenFlg flags.
• static string genPrmGet( const string &path, const string &oval = "", const string &user = "root", char flags = NoFlg ); — Getting the generic parameter path from the Generic Storage ("<gen>.SYS") on behalf of the user and according to the ReqGenFlg flags. If the data are not available the value oval is returned. On the Configuration File there are used the object parameters by the tags "prm" and on the Data Base there is used the table "SYS".
• static void genPrmSet( const string &path, const string &val, const string &user = "root", char flags = NoFlg ); — Setting/Saving the generic parameter path to the Generic Storage ("<gen>.SYS") of the user and according to the ReqGenFlg flags.

Public methods:

• int subVer( ); — Subsystem version.
• int tblLifeTime( ); — Lifetime of the inactive tables closing, in seconds.
• void setTblLifeTime( int vl ); — Sets lifetime of the inactive tables closing in vl seconds.
• TElem &openDB_E( ) — The structure of the table of registered databases.
• AutoHD<TTypeBD> at( const string &iid ) — Referencing to the DB module(DB type).

3.2 Modular object of types of databases (TTypeBD)

Public methods:

• virtual string features( ); — Keyword list of features supported by the DB.
• virtual int lsPr( ) — The DB priority base [0...9] in the generic storages list.
• bool fullDeleteDB( ); — Sign of the complete removal of the database.
• void list( vector<string> &list ) const; — The list of registered (opened) databases.
• bool openStat( const string &idb ) const; — Check the availability of the specified opened database.
• string open( const string &id ); — Opening of the database. Returns the end created identifier.
• void close( const string &id, bool erase = false ); — Closing the database. If the sign erase is set, the database will be completely removed.
• AutoHD<TBD> at( const string &id ) const; — Connection to the opened database.
• TBDS &owner( ) const; — Subsystem - the owner of the module.

3.3 The object of the database (TBD)

Public methods:

• TBD( const string &iid, TElem *cf_el ); — Initializing constructor.
• string id( ); — DB identifier.
• string fullDBName( ); — Full name a storage-DB.
• string name( ); — DB name.
• string dscr( ); — DB description.
• string addr( ) const; — Address of the database. The form of recording is different for each type of database.
• string codePage( ); — Codepage in which the data of the database are stored.
• int lsPr( ); — The DB priority in the generic storages list, in the range [0...99].
• double trTm_ClsOnOpen( ); — Transaction closing: after opening, seconds.
• double trTm_ClsOnReq( ); — Transaction closing: after request, seconds.
• int trPr_ClsTask( ); — Transaction closing: separate task priority.
• bool enableStat( ) const; — The state of the database: "Enabled".
• bool toEnable( ); — Sign of the DB: "To Enable".
• bool disabledByUser( ); — Sign of the node disabling by user, to prevent its enabling restore.
• void setName( const string &inm ); — Setting the DB name.
• void setDscr( const string &idscr ); — Setting the DB description.
• void setAddr( const string &iaddr ); — Setting the DB address.
• void setCodePage( const string &icp ); — Setting of the codepage for the storage of the DB data.
• void setLsPr( int vl ); — Setting the DB priority in the generic storages list, in the range [0...99].
• void setToEnable( bool ivl ); — Setting of the sign: "To Enable".
• virtual void enable( ); — Enabling of the DB.
• virtual void disable( ); — Disabling of the DB.
• virtual void allowList( vector<string> &list ) const; — The list of the tables in this DB.
• void list( vector<string> &list ) const; — The list of opened tables.
• bool openStat( const string &table ) const; — The sign that indicates of the fact that the requested table is opened.
• virtual void open( const string &table, bool create ); — Opening of the table. If the sign create is set, in the case of absence the table will be created.
• virtual void close( const string &table, bool del = false, long tm = -1 ); — Closing of the table. If the sign del is set, the table will be completely removed.
• AutoHD<TTable> at( const string &name ) const; — Connection to the table.
• virtual void sqlReq( const string &req, vector< vector<string> > *tbl = NULL, char intoTrans = EVAL_BOOL ); — Sending the SQL-request req to the DB and receiving the result in tabular form tbl. If set intoTrans to true then will open transaction for the request, else if set to false then transaction will close.
• virtual void transCloseCheck( ) — The function call periodic for opened transaction check to close for old transaction or overloaded.
• TTypeBD &owner( ) const; — DB type – the owner of the DB.

Protected attributes:

• ResMtx resTbls, connRes; — locks of the table and connection resources.

Protected methods:

• virtual TTable *openTable( const string &table, bool create ); — The modular method for opening the table.

3.4 The object of the table (TTable)

Data:
Flags of the SQL requests (enum – TTable::SQLFeqFlag):

• SQLNoFlg (0) — no list flag;
• SQLOrderForSeek (0x01) — sort-order the records at all requested fields, needed for PostgreSQL in the limiting SEEK requests;
• SQLFirstSkipForSeek (0x02) — use the FIRST and SKIP SELECT operators, needed for FireBird in the limiting SEEK requests.

Item of the table structure (class — TTable::TStrIt):

• string nm, tp, def; — field name, type and the default value;
• int key; — field key;
• TStrIt( ) — constructor by default;
• TStrIt( const string &inm, const string itp, int ikey, const string &idef = "" ) — the main parametric constructor.

Public methods:

• TTable( const string &name ); — Initializing constructor.
• string name( ); — Table name.
• string fullDBName( ); — Full name a storage-table into DB.
• virtual void fieldStruct( TConfig &cfg ); — Getting the structure of the table.
• virtual bool fieldSeek( int row, TConfig &cfg, const string &cacheKey = "" ); — Scanning the records cfg of the table by row, where cacheKey defines the seek cache using — preloading the result in whole and significant acceleration.
• virtual void fieldGet( TConfig &cfg ); — Request the specified record. The requested record is determined by the values of key cells of the original record cfg.
• virtual void fieldSet( TConfig &cfg ); — Setting the values of the specified record. In the case of absence the record will be removed.
• virtual void fieldDel( TConfig &cfg ); — Deleting of the specified record.
• virtual void fieldFix( TConfig &cfg, const string &langLs = "" ); — Internal request declaration of fixing fields, for the SQL request mostly. Use langLs for the languages list separated by ';' to create the corresponded translation columns.
• TBD &owner( ) const; — DB – the owner of the table.
• virtual string getSQLVal( TCfg &cf, uint8_t RqFlg = 0 ); — Get the SQL encoded value from cf for placing to the SQL request.
• virtual void setSQLVal( TCfg &cf, const string &vl, bool tr = false ); — Set the SQL encoded value to cf from the SQL response table.
• bool fieldSQLSeek( int row, TConfig &cfg, const string &cacheKey, int flags = SQLNoFlg ); — Unified-ANSI SQL variant of the fieldSeek() request with the TTable::SQLFeqFlag flags, which implements also the OpenSCADA multilaguage translation (the "TR" feature).
• void fieldSQLGet( TConfig &cfg ); — Unified-ANSI SQL variant of the fieldGet() request, which implements also the OpenSCADA multilaguage translation (the "TR" feature).
• void fieldSQLSet( TConfig &cfg ); — Unified-ANSI SQL variant of the fieldSet() request, which implements also the OpenSCADA multilaguage translation (the "TR" feature).
• void fieldSQLDel( TConfig &cfg ); — Unified-ANSI SQL variant of the fieldDel() request.

Protected attributes:

• time_t mLstUse; — time of the last usage;
• vector<TStrIt> tblStrct; — table structure, list of the table items;
• map<string, vector< vector<string> > > — container of the SEEK sessions in the PRELOAD mode;

4 Subsystem "Data acquisition"

The subsystem "Data acquisition" is represented by the TDAQS object which contains modular objects of the data sources' types TTypeDAQ and the objects of the libraries of parameters' templates of subsystem "Data acquisition" TPrmTmplLib. Object of the data sources types contains objects of the controllers TController and objects of the parameters' types TTypeParam. Parameters' types objects are provided by the controller module and contain the DB structure of the separate parameters' types (analog, digital ...). Controllers' objects contain parameters' objects TParamContr. Each parameter is associated with only one type of the parameter. For the attribute storage parameter is inherited from the values object TValue, which contains the attributes' values TVal. The library of the parameters' templates of this subsystem contains templates' objects TPrmTmpl. An example of the described hierarchical structure is shown in Fig. 4.

Fig. 4. Hierarchical structure of the subsystem "Data acquisition".

Subsystem contains the types of data sources. The source may be virtually any substance providing any data. Type of source can be divided into individual sources (controllers) within the limits of the particular type. For example, if we take the data from the operating system (OS), then the single source can be the separate operating system of the separate PC.

Data source (controller) is further divided (contains) into the parameters. The parameter is the part of the data source. In the case of the OS it will be, for example,: used RAM, the processor's frequency and many other parts.

Parameter, in its turn, contains the attributes, which provide the data. In addition to the basic data attributes can provide the related or detailing data. In the case of the same operating system and the memory usage, the attributes may not only provide the used memory, and also how much it all, how much in the swap, etc.

Some of the implementation of the data sources may provide the possibility of setting the structure of the parameter based on previously developed parameters' templates. For this purpose subsystem contains templates' libraries, which, in their turn, provide the parameters' templates . The example shows a library of templates "base" with the templates "digAlrm" and "smplBrd".

At the level of the subsystem the redundancy mechanism for data sources is provided. Redundancy means the possibility of coordinated work of several OpenSCADA stations to perform common task of data acquisition from the same data sources.

4.1 Object of subsystem "Data acquisition" (TDAQS)

Public methods:

• int subVer( ); — Version of the subsystem.
• void subStart( ); — Start the subsystem.
• void subStop( ); — Stop the subsystem.
• AutoHD<TTypeDAQ> at( const string &name ) const; — Connection to the type of data source.
• AutoHD<TCntrNode> daqAt( const string &path, char sep = 0, bool noex = false, bool waitForAttr = false, TCntrNode *ndBase = NULL ) const; — Generic connection to the DAQ node by path or separated by sep string, and from the base ndBase in the relative addressing. Set waitForAttr at the DAQ node waiting is an attribute. Do not throw an exceptions if set noex.
• AutoHD<TValue> prmAt( const string &path, char sep = 0, bool noex = false, TCntrNode *ndBase = NULL ) const; — Connection to the parameter by path or separated by sep string, and from the base ndBase in the relative addressing. Do not throw an exceptions if set noex.
• AutoHD<TVal> attrAt( const string &path, char sep = 0, bool noex = false, TCntrNode *ndBase = NULL ) const; — Connection to the parameter's attribute by path or separated by sep string, and from the base ndBase in the relative addressing. Do not throw an exceptions if set noex.
• void ctrListPrmAttr( XMLNode *nd, const string &addrBase, bool toPrm = false, char sep = 0, const string &pref = "", TCntrNode *ndBase = NULL ); — Browsing list for items of attributes of parameters or only the parameters DAQ by toPrm with prefix pref from path or separated by sep string from base address addrBase, and from the base ndBase in the relative addressing.
• string tmplLibTable( ); — Name of table to store the parameters' templates of the subsystem "Data acquisition".
• void tmplLibList( vector<string> &list ) const; — The list of available parameters' templates.
• bool tmplLibPresent( const string &id ) const; — Check the availability of the parameter's template id.
• void tmplLibReg( TPrmTmplLib *lib ); — Registration of the parameter's template lib.
• void tmplLibUnreg( const string &id, int flags = NodeNoFlg ); — Deleting/removing of the registration of the parameter's template id, according to the flags.
• AutoHD<TPrmTmplLib> tmplLibAt( const string &id ) const; — Connection to the parameter's template id.
• double rdRestDtTm( ); — Maximum depth of the archive data recovery when starting in hours.
• void setRdRestDtTm( double vl ); — Set of the maximum depth of the archive data recovery when starting in hours.
• void rdActCntrList( vector<string> &ls, bool isRun = false ); — The list of active controllers working in the redundancy scheme. When we indicate isRun there will be in the list only running controllers in this station.
• string rdStRequest( const string &cntr, XMLNode &req, const string &prevSt = "", bool toRun = true ); — Request req to the redundant station on behalf of the controller cntr. The station for the request is selected after specified in prevSt for the running remote controller when indicating toRun.
• TElem &elLib( ); — The structure of the table of the libraries if parameters' templates.
• TElem &elTmpl( ); — The structure of the table of parameters' templates.
• TElem &elTmplIO( ); — The structure of the attributes of parameters' templates.
• TElem &elErr( ); — The structure of the attribute(s) of parameters' errors.

4.2 Modular object of the controller's type (TTypeDAQ)

Public methods:

• string DAQPath( ); — Getting for DAQ-address of the element.
• void modStart( ); — Start of the module.
• void modStop( ); — Stop of the module.
• void list( vector<string> &list ) const; — The list of the controllers.
• bool present( const string &id ) const; — Check for the availability of the specified controller object.
• string add( const string &id, const string &daq_db = DB_GEN ); — Add the controller object. Returns the end created identifier.
• void del( const string &id ); — Delete the controller object.
• AutoHD<TController> at( const string &id, const string &who = "" ) const; — Connect to the controller object.
• bool tpPrmPresent( const string &name_t ); — Check for the availability of the specified controller type.
• unsigned tpPrmToId( const string &name_t ); — Getting of the index of the parameters' types by their names.
• int tpParmAdd( const char *id, const char *n_db, const char *name ); — Addition/registration of the parameters' types.
• unsigned tpPrmSize( ); — Quantity of the parameters' types.
• TTypeParam &tpPrmAt( unsigned id ); — Get the object of the parameters' type.
• virtual bool compileFuncLangs( vector<string> *ls = NULL ); — Request of the list of languages for which it is realised the possibility of formation of user procedures in this module, and check for fact of that support.
• virtual void compileFuncSnthHgl( const string &lang, XMLNode &shgl ); — Request the rules of the syntax highlight shgl for the specified language lang.
• virtual string compileFunc( const string &lang, TFunction &fnc_cfg, const string &prog_text, const string &usings = "", int maxCalcTm = 0 ); — compiling-registering of the user function on the supported programming language lang and on the source code of procedure prog_text, based on the procedure parameters fnc_cfg. Returns address of the compiled function's object, ready for execution.
• virtual bool redntAllow( ); — State of support the redundancy mechanisms by the module. Should be overridden and return TRUE if supported, otherwise FALSE.

Protected methods:

• virtual TController *ContrAttach( const string &name, const string &daq_db ); — Connecting of the controller. It must be obligatory overridden in the descendant of the module.

4.3 Controller's object (TController)

Data:
Redundancy modes (enum TController::Redundant):

• Off (0) — Turned off;
• Asymmetric (1) — asymmetric;
• OnlyAlarms (2) — only alarms, suppressing on the reserve.

Command specific

• Any (0) — any mode.

Public methods:

• TController( const string &name_c, const string &daq_db, TElem *cfgelem ); — Initializing constructor of the controller.
• string DAQPath( ); — Getting for DAQ-address of the element.
• string id( ) const; — Controller ID.
• string workId( ); — Work ID of the controller, including the ID of the module.
• string name( ); — Controller's name.
• string descr( ); — Controller's description.
• int64_t timeStamp( ); — Timestamp of the object changing as maximum of timestamps of the included parameter objects.
• virtual string getStatus( ); — Request function of the controller status.
• string DB( bool qTop = false ) const; — Storage name of the controller's instance, qTop for the storage queue top.
• string tbl( ) const; — Name of the table of DB of the controller's instance.
• virtual string tbl( const TTypeParam &tP ) const; — Name of the table of DB of the parameter's instance for the parameter type tP.
• string fullDB( bool qTop = false ) const; — The full name of the table of storage of the controller's instance, qTop for the storage queue top.
• void setName( const string &nm ); — Set the controller's name.
• void setDescr( const string &dscr ); — Set the controller's description.
• void setDB( const string &vl, bool qTop = false ); — Setting of the storage name of the controller's instance, qTop for the storage queue top.
• bool toEnable( ); — Sign "To enable the controller".
• bool toStart( ); — Sign "To start the controller".
• bool enableStat( ) const; — Status "Enable".
• bool startStat( ); — Status "Run".
• int messLev( ); — Messages level of diagnostic information.
• void start( ); — Controller's start.
• void stop( ); — Controller's stop.
• void enable( ); — Controller's enabling.
• void disable( ); — Controller's stopping.
• void list( vector<string> &list ) const; — Parameter's list in the controller.
• bool present( const string &id ) const; — Check for the availability of the parameter id.
• string add( const string &id, unsigned type ); — Addition the parameter id of the type type. Returns the end created identifier.
• void del( const string &id, int flags = NodeNoFlg ); — Deleting the parameter id, according the {TCntrNode,TParamContr}::EnDisFlag flags.
• AutoHD<TParamContr> at( const string &id, const string &who = "th_contr" ) const; — Connection to the controller's parameter id.
• bool redntUse( Redundant md = Asymmetric ); — Redundancy state for mode md.
• void setRedntUse( bool vl ); — Changing of the getting the data from the backup station mode.
• Redundant redntMode( ); — Redundancy mode ("<high>", "<low>", "<optimal>", {ForceStation}), enabling.
• void setRedntMode( Redundant vl ); — Setting of the redundancy mode, enabling.
• string redntRun( ); — Configuration of the preferred execution.
• void setRedntRun( const string &vl ); — Setting the configuration of the preferred execution.
• virtual void redntDataUpdate( ); — Operation of the data receiving from the backup station, called automatically by the service procedure of the redundancy scheme of the subsystem.
• virtual string catsPat( ); — List of the regular expression rules, separated by '|', for matching by category the messages generated by the object.
• virtual void messSet( const string &mess, int lev, const string &type2Code = "OP", const string &prm = "", const string &cat = "" ); — Formation of the DAQ-sourced messages for the parameter object prm ({PrmId}), or the controller object in whole if the parameter object is not specified, for the message mess, level lev and for the type code type2Code. This function generates the messages with the unified DAQ-transparency category {type2Code}{ModId}:{CntrId}[.{prm}][:{cat}].
• void alarmSet( const string &mess, int lev = -TMess::Crit, const string &prm = "", bool force = false ); — Formation of alarms (a violation) for the parameter object prm ({PrmId}\n{PrmNm}), or the controller object in whole if the object is not specified, the message mess and level lev. The negative value of the level lev is used to set and positive for removal of the violation. This function generates the violation and message with the category al{ModId}:{CntrId}[.{prm}] and the text {CntrNm} > {PrmNm}: {MessText}. The alarms clearance, as the setting also, works in the toggling mode, so means of passing the clearance messages to the message buffer, and the same clearance, only at the according violations presence, what may be disabled setting force.
• TTypeDAQ &owner( ) const; — The type of the data source (module) - the owner of the controller.

Protected attributes:

• bool enSt; — The sign "Enable".
• bool runSt; — The sign "Running".

Protected methods:

• virtual void enable_( ); — Enabling of the controller object. Usually at this stage the initialisation of the parameters' objects and their interfaces in the form of attributes is made, the attributes can sometimes be requested from the associated remote source.
• virtual void disable_( ); — Disabling the controller object.
• virtual void start_( ); — Starting the controller object. Usually at this stage the task of periodic or scheduled polling is created and started.
• virtual void stop_( ); — Stopping the controller object.
• virtual TParamContr *ParamAttach( const string &id, int type ); — Modular method of the creation/opening of the new parameter.

4.4 Parameters' type object (TTypeParam)

Public methods:

• TTypeParam( const char *iid, const char *iname, const char *idb = "", bool i_isPrmCntr = false ); — Initializing constructor.
• virtual void create( TParamContr *prm ); — Create or set the parameter prm type.
• virtual void destroy( TParamContr *prm ); — Remove or clean the parameter prm type.
• virtual string DB( const TController *cntr ) const; — Get table name of the parameters of the controller cntr.

Will be removed in v1.0, use TController::tbl() instead.

• void setDB( TController *cntr, const string &vl ); — Set the table name of the parameters of the controller cntr.

Will be removed in v1.0.

• virtual void enable( TParamContr *prm ); — To enable the parameter prm.
• virtual void disable( TParamContr *prm ); — To disable the parameter prm.
• virtual bool cfgChange( TParamContr *prm, TCfg &cfg ); — The configuration filed cfg of the parameter prm change.
• virtual void vlGet( TParamContr *prm, TVal &vo ); — Predicting function of the value getting, through the parameter prm. It is used for direct (synchronous) reading.
• virtual void vlSet( TParamContr *prm, TVal &vo, const TVariant &vl, const TVariant &pvl ); — Predicting function of the value setting, through the parameter prm. It is used for direct (synchronous) writing vl with the previous value into pvl.
• bool vlSetRednt( TVal &vo, const TVariant &vl, const TVariant &pvl ); — Processing of the values setting, mostly in the predicting function, under the redundancy. Returns true at processing the setting in the redundancy.
• virtual void vlArchMake( TParamContr *prm, TVal &val ); — Notifying function of the creation of the archive for the val attribute, through parameter prm. It is used to configure the created archive in accordance with the peculiarities of the data source.
• virtual void getVals( TParamContr *prm ); — Asynchronous mode internal realization, called into the controller object cycle for parameter prm.
• virtual bool cntrCmdProc( TParamContr *prm, XMLNode *opt ); — Function of requests' processing of the control interface, from parameter prm.

Public attributes:

• string name; — Parameter's type name.
• string descr; — Parameter's type description.
• string db; — DB of the parameter's type.

4.5 Object of the physical level parameter (TParamContr)

Data:
Flags of the enabling/disabling modes of the node (enum TParamContr::EnDisFlag):

• TParamContr::NodeRemove_NoArch (TCntrNode::NodeSpecific) — do not remove archives at the DAQ-Parameter node removing.

Public methods:

• TParamContr( const string &name, TTypeParam *tpprm ); — Initializing constructor.
• string DAQPath( ); — Getting for DAQ-address of the element.
• string ownerPath( bool inclSelf = false ); — The parameter-owner path, include inclSelf the parameter.
• bool operator==( TParamContr & PrmCntr ); — Parameter's comparison.
• string id( ); — Parameter's ID (key).
• string name( ); — Parameter's name.
• string descr( ); — Parameter's description.
• bool toEnable( ); — Sign "To enable parameter".
• int64_t timeStamp( ); — Timestamp of the object changing accounting the included parameter objects.
• bool enableStat( ) const; — Status "Enable".
• void setName( const string &inm ); — Setting of the parameter's name.
• void setDescr( const string &idsc ); — Setting of the parameter's description.
• void setToEnable( bool vl ); — Setting of the sign "To enable the parameter".
• void list( vector<string> &list ) const; — Parameter's list in the parameter.
• bool present( const string &id ) const; — Check for the availability of the parameter id.
• string add( const string &id, unsigned type = 0 ); — Addition of the parameter id of the type type. Returns the end created identifier.
• void del( const string &id, int flags = NodeNoFlg ); — Deleting the parameter id, according the {TCntrNode,TParamContr}::EnDisFlag flags.
• AutoHD<TParamContr> at( const string &id, const string &who = "th_prm" ) const; — Connection to the controller's parameter id.
• TTypeParam &type( ) const; — Parameter's type.
• virtual TElem *dynElCntr( ); — Container of the dynamic elements of the DAQ attributes.
• virtual void enable( ); — Enable the parameter object, the formation of the attributes set and filling them with the value of unreliability is made.
• virtual void disable( ); — Disable the parameter object.
• TController &owner( ) const; — Controller – the parameter's owner.

Protected methods:

• virtual void setType( const string &tpId ); — called to change the parameter type to tpId and can be processed in the module object to change own data.

4.6 Object of the value (TValue)

Public methods:

• bool dataActive( ); — Activity (updatable) flag of data.
• virtual string DAQPath( ); — Getting for DAQ-address of the element.
• void vlList( vector<string> &list ) const; — Getting the attributes' list.
• bool vlPresent( const string &name ) const; — Check for the availability of the specified attribute.
• AutoHD<TVal> vlAt( const string &name ) const; — Connection to the attribute.

Protected methods:

• TConfig *vlCfg( ) — Getting of the associated configuration object. If NULL is returned then there is no associated configuration object.
• void setVlCfg( TConfig *cfg ); — Setting of the associated configuration object cfg.
• bool vlElemPresent( TElem *ValEl ); — Check for the availability if the attributes' elements ValEl.
• void vlElemAtt( TElem *ValEl ); — Attach of the data structure ValEl.
• void vlElemDet( TElem *ValEl ); — Detach of the data structure ValEl.
• TElem &vlElem( const string &name ); — Get the data structure by its name name.
• virtual TVal* vlNew( ); — Called at the stage of a new attribute creation. It can be overridden to implement the particular behaviour within its own, inherited from the TVal, class during the access of the attribute.
• virtual void vlGet( TVal &vo ); — Called for an attribute with the direct reading mode TVal::DirRead (synchronous mode, or reading from an internal buffer of the object) when reading the value in order to directly read the value from the physical source or the object buffer.
• virtual void vlSet( TVal &vo, const TVariant &vl, const TVariant &pvl ); — Called for the attribute vo with the direct recording mode TVal::DirWrite (synchronous or writing to an internal buffer of the object) when set to immediate record the value vl to the physical source or buffer object, with the previous value pvl.
• virtual void vlArchMake( TVal &val ); — Called at the stage of creation the value archive with the val attribute as the source in the order to initialise the qualitative characteristics of the archive buffer according to the characteristics of the data source and polling.

4.7 Attribute's object (TVal)

Data:
Additional flags to the object #TFld (enum TVal::AttrFlag):

• TVal::DirRead(0x100) — Flag for the direct reading of the value;
• TVal::DirWrite(0x200) — Flag for the direct writing of the value;
• TVal::Dynamic(0x400) — Flag of the dynamic attribute, creates in typical from user procedures.
• TVal::NoSave(0x800) — Flag of the attribute can be changed but cannot be saved, that is do not mark its modified

Public methods:

• TVal( ); — Default constructor.
• TVal( TFld &fld ); — Initialization as the repository of dynamic data.
• TVal( TCfg &cfg ); — Initialization as the reflection of static data (DB).
• string DAQPath( ); — Getting for DAQ-address of the element.
• void setFld( TFld &fld ); — Initialization as the repository of dynamic data.
• void setCfg( TCfg &cfg ); — Initialization as the reflection of static data (DB).
• string name( ); — Attribute's name.
• int64_t time( ); — Timestamp of the the last/current value (10^-6s).
• void setTime( int64_t vl ); — Setting the timestamp outside the value setting.
• bool isCfg( ); — Sign of the value object created in base of a configuration element.
• bool dataActive( ); — Activity (updatable) flag of data.
• TVariant get( long long *tm = NULL, bool sys = false ); — Request of the value for the specified time tm. If NULL then it will be returned the last value.
• string getS( long long *tm = NULL, bool sys = false ); — Request of the string type value for the specified time tm. If NULL then it will be returned the last value.
• double getR( long long *tm = NULL, bool sys = false ); — Request of the real type value for the specified time tm. If NULL then it will be returned the last value.
• int64_t getI( long long *tm = NULL, bool sys = false ); — Request of the integer type value for the specified time tm. If NULL then it will be returned the last value.
• char getB( long long *tm = NULL, bool sys = false ); — Request of the boolean type value for the specified time tm. If NULL then it will be returned the last value.
• AutoHD<TVarObj> getO( int64_t *tm = NULL, bool sys = false ); — Request of the object type value.
• void set( const TVariant &value, long long tm = 0, bool sys = false ); — Setting of the value value.
• void setS( const string &value, long long tm = 0, bool sys = false ); — Setting of the string type value value.
• void setR( double value, long long tm = 0, bool sys = false ); — Setting of the real type value value.
• void setI( int64_t value, long long tm = 0, bool sys = false ); — Setting of the integer type value value.
• void setB( char value, long long tm = 0, bool sys = false ); — Setting of the boolean type value value.
• void setO( AutoHD<TVarObj> value, int64_t tm = 0, bool sys = false ); — Setting of the object type value value.
• AutoHD<TVArchive> arch( ); — Getting the associated with the value archive.
• void setArch( const AutoHD<TVArchive> &vl ); — Setting the associated with the value archive.
• string setArch( const string &nm = "" ); — Setting/creation new archive with proposed name nm or automatic, if name empty.
• bool reqFlg( ); bool resB1( ); bool resB2( ) — Get some realisation-specific flags.
• void setReqFlg( bool vl ); void setResB1( bool vl ); void setResB2( bool vl ) — Set some realization-specific flags.
• TFld &fld( ); — Descriptor of the attribute's structure.

4.8 Object of the templates library of parameters of the "DAQ" subsystem (TPrmTmplLib)

Public methods:

• TPrmTmplLib( const char *id, const char *name, const string &lib_db ); — Initializing constructor.
• string id( ); — Library ID.
• string name( ); — Library name.
• string descr( ); — Library description.
• string DB( bool qTop = false ) const; — DB of the library instance, qTop for the storage queue top.
• string tbl( ) const; — DB table of the library instance.
• string fullDB( bool qTop = false ) const; — Full address of the DB table of the library instance, qTop for the storage queue top.
• bool startStat( ); — Sign "Library started".
• void start( bool val ); — Satart/stop of the library.
• void setName( const string &vl ); — Setting of the library name.
• void setDescr( const string &vl ); — Setting of the library description.
• void setDB( const string &vl, bool qTop = false ); — Setting of the storage name of the library, qTop for the storage queue top.
• void setFullDB( const string &vl ); — Setting of the full address of the DB table of the library instance.
• void list( vector<string> &ls ) const; — Templates list in the library.
• bool present( const string &id ) const; — Check for the presence of the template id in the library.
• AutoHD<TPrmTempl> at( const string &id ) const; — Connection to the template id.
• void add( const char *id, const char *name = "" ); — Addition of the template id.name into the library.
• void del( const char *id, bool full_del = false ); — Deleting of the template id from the library.
• TDAQS &owner( ) const; — Object subsystem "DAQ", owner of the library.

4.9 The object of the parameter's template of the "DAQ" subsystem (TPrmTempl)

Data:
Additional flags to the attribute's object of the function IO (enum TPrmTempl::IOTmplFlgs):

• TPrmTempl::AttrRead (0x10) — Read only attribute;
• TPrmTempl::AttrFull (0x20) — Full access attribute;
• TPrmTempl::CfgPublConst (0x40) — Public constant;
• TPrmTempl::CfgLink (0x80) — External link;
• TPrmTempl::LockAttr (0x100) — Blocked attribute.
• reserves up to 0x800 and 0x1000 is already used by TFunction::IO

Public methods:

• TPrmTempl( const char *id, const char *name = "" ); — Initializing constructor of the template.
• string id( ); — Parameter's template ID.
• string name( ); — Parameter's template name.
• string descr( ); — Parameter's template description.
• int maxCalcTm( ); — The limit on the maximum time calculation of procedure template.
• string progLang( ); — Parameter's template programming language.
• bool progTr( ); — Parameter's template program transaltion.
• string prog( ); — Parameter's template program.
• int64_t timeStamp( ); — Timestamp for the object changes into DB.
• void setName( const string &inm ); — Setting the name of the parameter's template.
• void setDescr( const string &idsc ); — Setting the description of the parameter's template.
• void setMaxCalcTm( int vl ); — Setting the limit on the maximum time calculation of procedure template.
• void setProgLang( const string &ilng ); — Setting the programming language of the parameter's template.
• void setProgTr( bool vl ); — Setting the program of the parameter's template translation.
• void setProg( const string &iprg ); — Setting the program of the parameter's template.
• void setStart( bool val ); — Start/stop of the parameter's template.
• AutoHD<TFunction> func( ); — Connection to the function formed by the template.
• TPrmTmplLib &owner( ) const; — Object of the templates' library - the owner of the template.

4.9.1 The object of the implementation of the template's parameters of the "DAQ" subsystem (TPrmTempl::Impl)

Data:
Structure of template links (class — TPrmTempl::Impl::SLnk):

• int objOff; — offset of an Object part to direct accessing by it;
• string addr, addrSpec; — original and special (like to ModBus final address) link address;
• AutoHD<TVal> con; — connection to the destination, DAQ attribute;
• SLnk( const string &iaddr = "" ) — structure constructor.

Public methods:

• Impl( TCntrNode *iobj, const string &iname = "", bool blked = true ); — Constructs for the template implementation with the control node iobj and the name iname.
• int lnkId( const string &nm ); — Returns the link nm (function's IO) identifier/number.
• bool lnkPresent( int num ); — Checks the link number num to presence, returns TRUE for accessibility the link.
• void lnkList( vector<int> &ls ) const — Gets for list of the linked attributes ID.
• virtual void lnkAdd( int num, const SLnk &l ); — Adds a link with the number num and the "SLnk" structure l.
• string lnkAddr( int num, bool spec = false ) const; — Returns the link address for the number num and the special link address for spec.
• void lnkAddrSet( int num, const string &vl, bool spec = false ); — Sets the link address to vl for number num and the special link address for spec.
• virtual bool lnkInit( int num, bool toRecnt = false ); — Inits/connects the link for the number num, which means reading "addr" and forming "con" or "addrSpec". Set toRecnt to force the re-linking. Returns TRUE at the need for the initialization/activation repeating.
• virtual bool lnkActive( int num ); — Checks the link number num initialization/activation state.
• virtual TVariant lnkInput( int num ); — Returns a value by the link number num.
• virtual bool lnkOutput( int num, const TVariant &vl ); — Sets the value vl by the link number num. Returns TRUE at correct setting.
• void addLinksAttrs( TElem *attrsCntr = NULL ); — Adds links and DAQ parameter's attributes, at attrsCntr presence.
• bool initLnks( bool toRecnt = false ); — Inits/connects all the links. Set toRecnt to force the re-linking. Returns TRUE at presence at last one not initiated link — needs for the initialization/activation repeating.
• virtual void cleanLnks( bool andFunc = false ); — Cleans all the links and the function, for andFunc.
• void inputLinks( ); — Gets for values of all the links.
• void outputLinks( ); — Sets for values of all the links.
• void archAttrs( TValue *vl ); — Updating the attribute values in vl from the Logical Level context and with writing them to the archive for the archivating attributes.
• virtual bool cntrCmdProc( XMLNode *opt, const string &pref = "/cfg" ); — Calls for control interface of the links with the prefix "pref".

Protected attributes:

• map<int,SLnk> lnks; — links contatiner;
• TCntrNode *obj; — associated control node;

Protected methods:

• virtual string lnkHelp( ); — Returns help for the links address' syntax.

5 Subsystem "Archives-History"

Subsystem "Archives" is represented by an object TArchiveS, which contains at the subsystem level the modular objects of the archivers types TTypeArchivator. Each object of the archiver type contains objects of the messages' archivers TMArchivator and values' archivers TVArchivator. In addition, the subsystem object contains the methods of the messages archive and objects of the values' archives TVArchive. The object of the values' archive TVArchive contains the buffer of values through the inheritance of the buffer object TValBuf. To connect the archive of values with the archivers the object of the value element TVArchEl is provided. This object is contained in the archiver and it is referenced by the archive. Structure of the subsystem "Archives" is presented in Fig. 5.

Fig. 5. Hierarchical structure of the subsystem "Archives".

Subsystem "Archives" contains the mechanisms for archiving of messages and values. It directly contains the messages' archive together with its buffer. Contains methods for accessing the archives of the values and for the archivers of values and messages. Besides it performs the actively data acquisition from sources of values for the archives of values, as well as archiving the archive of messages by the archivers.

Archive of values (TVArchive) contains the buffer (TValBuf) for intermediate values' accumulation before archiving. It is connected with the source of values in the person of OpenSCADA parameters in active or passive mode, as well as with other sources in the passive mode. To archive to the physical storage it is connected with the values' archivers of various types.

Object of the buffer TValBuf contains an array of values of the main types of OpenSCADA: string, integer, real and boolean. It is supported the storage of values in the modes of hard, soft grid and in the free access mode. It is also provided the mode of high-resolution time (microseconds). It is used for direct storage of large arrays of values, and for the exchange of large arrays by the frame-accurate method of access.

Root object of the module of subsystem "Archives" (TTypeArchivator) contains information about the specific type of module. Within the individual modules it can implement their own module-wide functions. In general, for modules of this type it contains methods to access the repositories of values and messages.

Object of the messages' archiver (TMArchivator) contains the specific implementation of the message storage. In general, for messages' archivers the interface of access to the implementation of an archiving mechanism in modules is provided.

Object of the values' archiver (TVArchivator) contains the specific implementation of the repository of values. In general, for the values' archivers the access interface to implementation of the archiving mechanism and the appointment of archives of values for service by archiver are provided.

Object of the archive element TVArchEl links the archive objects with the archivers. It is used to access the archiver from the archive, as well as to archives from the archiver, ie for cross-calls.

5.1 The object of the subsystem "Archives" (TArchiveS)

Modes of forming ID of the automatic created archives:

• BothPrmAttrId — combining the parameter and the attribute ID.
• OnlyPrmId — only the parameter ID.
• OnlyAttrId — only the attribute ID.
• AllCntrPrmAttrId — all controller, parameter and attribute ID.

Public methods:

• int subVer( ); — Subsystem's version.
• int messPeriod( ); — Period of archiving of messages from the buffer (seconds).
• int valPeriod( ); — Acquisition of values period for the active archivers (milliseconds).
• int valPrior( ); — Priority of the tasks of the values acquisition for the active archivers.
• bool valForceCurTm( ); — Points to force of current time as the time-stamp of the getting values.
• AutoIdMode autoIdMode( ); — Gets the mode of forming ID of the automatic created archives.
• void setMessPeriod( int ivl ); — Setting the period of the archiving of messages from the buffer (seconds).
• void setValPeriod( int ivl ); — Setting the values' acquisition period for active archivers (milliseconds).
• void setValPrior( int ivl ); — Setting the priority of the values' acquisition task for the active archivers.
• void setValForceCurTm( bool vl ); — Force of current time as the time-stamp of the getting values.
• void setAutoIdMode( AutoIdMode vl ); — Sets the mode vl of forming ID of the automatic created archives.
• void setToUpdate( ); — Planing update flag set.
• void subStart( ); — Start of the subsystem.
• void subStop( ); — Stop of the system.
• void valList( vector<string> &list ) const; — The list of the values'archives in the subsystem.
• bool valPresent( const string &id ) const; — Check for the availability of the values' archive id.
• string valAdd( const string &id, const string &idb = DB_GEN ); — Addition of the new values' archive id. Returns the end created identifier.
• void valDel( const string &id, bool db = false ); — Deleting of the values' archive id.
• AutoHD<TVArchive> valAt( const string &id ) const; — Connection/addressing to the values' archive id.
• void setActMess( TMArchivator *a, bool val ); — Setting of the messages archivator a into the active status val. Active archivator will be provided by the subsystem with the flow of messages.
• void setActVal( TVArchive *a, bool val ); — Setting of the value archive a into the active status val. Active archive will be provided by the subsystem with the periodic flow of values (is determined by the periodicity of the archive).
• AutoHD<TTypeArchivator> at( const string &name ); — Connection/addressing to the archiver's type (module) name.
• void messPut( time_t tm, int utm, const string &categ, int8_t level, const string &mess, const string &arch = "" ); void messPut( const TMess::SRec &rec, const string &arch = "" ); — Location of the message mess with the level of the category categ and time tm+utm, or the complete TMess::SRec structure rec, into the buffer, and then into the messages' archive or direct to the pointed archivators arch (separated by symbol ';').
• void messPut( const vector<TMess::SRec> &recs, const string &arch = "" ); — Location of the group of values recs into the buffer, and then into the messages' archive or direct to the pointed archivators arch (separated by symbol ';').
• time_t messGet( time_t bTm, time_t eTm, vector<TMess::SRec> &recs, const string &category = "", int8_t level = TMess::Debug, const string &arch = "", time_t upTo = 0 ); — Values' request reqs for the specified period of time bTm, eTm for the specified category (by the template) category and level level from the archivators arch (separated by symbol ';'). Return time of the request stop, useful for continue from the point.
• time_t messBeg( const string &arch = "" ); — Beginning of the messages' archive as a whole or for the specified archiver arch.
• time_t messEnd( const string &arch = "" ); — End of the messages' archive as a whole or for the specified archiver arch.
• time_t rdTm( ); — Time of the last redundancy operation, maximum for message archivers in the active redundancy.
• double rdRestDtOverTm( ); — Overtime of the reserve history reload at start in days.
• void setRdRestDtOverTm( double vl ); — Setting of overtime of the reserve history reload at start in days.
• void rdActArchMList( vector<string> &ls, bool isRun = false ); — The list of active message archivators working in the redundancy scheme. When we indicate isRun there will be in the list only running message archvators in this station.
• string rdStRequest( const string &arch, XMLNode &req, const string &prevSt = "", bool toRun = true ); — Request req to the redundant station on behalf of the message archivator arch. The station for the request is selected after specified in prevSt for the running remotely message archivators when indicating toRun.
• TElem &messE( ); — DB structure of the messages' archivers.
• TElem &valE( ); — DB structure of the values' archivers.
• TElem &aValE( ); — DB structure of the values' archives.

Public methods:

• bool SubStarting; — The subsystem starting flag.

5.2 The object of the values' archive (TVArchive)

Data:
The data acquisition mode/source (enumeration — TVArchive::SrcMode):

• SaveCur (-1) — save current mode in the commands;
• Passive (0) — passive mode of the data acquisition, the source puts the data into the archive itself;
• DAQAttr (1) — the data acquisition from the DAQ attribute when the DAQ attribute puts the data into the archive itself;
• ActiveAttr (2) [DEPRECATED] — active mode of the data acquisition from the DAQ attribute when the DAQ attribute is periodically polled by the subsystem "Archives";

The data combination mode (enumeration — TVArchive::CombMode):

• MovAver (0) — moving average;
• LastVal (1) — last-previous value;
• MinVal (2) — minimum value;
• MaxVal (3) — maximum value.

Data modes of the service request "Requesting for values of the specified value archive" (enumeration — TVArchive::ServReqDtMode):

• DMSimple (0) — simple record, one item per line;
• DMPack (1) — packed record, one adjacent equal (rounded) value per line;
• DMBin (2) — array of unpacked binary values encoded by Base64.

Public methods:

• TVArchive( const string &id, const string &db, TElem *cf_el ); — Initializing constructor of the archive, where id — archive ID, db — DB for storage and cf_el — DB structure of the values' archives.
• string id( ); — Archive's ID.
• string name( ); — Archive's name.
• string dscr( ); — Archive's description.
• SrcMode srcMode( ); — Linkage mode with the data source.
• AutoHD<TVal> srcPAttr( bool force = false, const string &ipath = "" ); — Connect to associated attribute of parameter of data source.
• string srcData( ); — Parameters of the data source, in the case of access mode to the parameter this is the address of the parameter.
• bool toStart( ); — Sign: "Start the archive when starting the system".
• bool startStat( ); — Status: "Archive started".
• string DB( bool qTop = false ) const; — Storage address of the values' archive, qTop for the storage queue top.
• string tbl( ); — DB table of the values' archive.
• string fullDB( bool qTop = false ); — Full name of the storage table of the values' archive, qTop for the storage queue top.
• int64_t end( const string &arch = ARCH_BUF ); — End of the archive time at whole (arch="") or the specified archiver, buffer (arch="<bufer>").
• int64_t begin( const string &arch = ARCH_BUF ); — Start of the archive time at whole (arch="") or the specified archiver, buffer (arch="<bufer>").
• int64_t period( const string &arch = ARCH_BUF ); — Periodicity of the archive buffer or the specified archiver (microseconds).
• TFld::Type valType( bool full = false ); — Type of the archived value. full — request full type, else only generic.
• bool hardGrid( ); — Using of the hard grid in the archive buffer.
• bool highResTm( ); — Using of the high-resolution time in the archive buffer (microseconds).
• bool fillLast( ); — Fill pass points to a last value. Mostly the pass values fill by EVAL but sometime the source's data periodicity greater to the archive's one and it is normal.
• int size( ); — Archive buffer size (units).
• void setName( const string &inm ); — Setting the name of the archive.
• void setDscr( const string &idscr ); — Setting the description of the archive.
• void setSrcMode( SrcMode vl = SaveCur, const string &isrc = "<*>", bool noex = false ); — Setting the linkage mode with the data source.
• void setToStart( bool vl ); — Setting the sign: "Start the archive when starting the system".
• void setDB( const string &vl, bool qTop = false ); — Setting the storage address of the values' archive, qTop for the storage queue top.
• void setValType( TFld::Type vl ); — Setting the type of the archived value.
• void setHardGrid( bool vl ); — Setting the using of the hard grid in the archive buffer.
• void setHighResTm( bool vl ); — Setting of using of the high-resolution time in the archive buffer (microseconds).
• void setFillLast( bool vl ); — Set to fill pass points to a last value.
• void setSize( int vl ); — Setting of the archive buffer size (units).
• void setPeriod( int64_t vl ); — Setting the periodicity of the archive buffer.
• void start( ); — Start of the archive.
• void stop( bool full_del = false ); — Stop of the archive with it's completely deleting full_del.
• TVariant getVal( int64_t *tm = NULL, bool up_ord = false, const string &arch = "", bool onlyLocal = false ); — Request of the single value for the time tm and with the sign of the moving to the top up_ord from the specified archiver arch, buffer (arch = "<bufer>") or from all archivers in the course of falling quality (arch =""). To process the request only by the local station onlyLocal is set.
• void getVals( TValBuf &buf, int64_t beg = 0, int64_t end = 0, const string &arch = "", int limit = 100000, bool onlyLocal = false ); — Request of the values' frame buf for the time from beg to end from the specified archiver arch, buffer (arch = "<bufer>") or from the all archivers in the course of falling quality (arch =""), limiting the size of the request limit of the record. To request only the local archives, without compensation gaps in the archives from the backup stations, set onlyLocal.
• void setVals( TValBuf &buf, int64_t beg, int64_t end, const string &arch ); — Set of the values' frame buf for the time from beg to end to the specified archiver arch, buffer (arch = "<bufer">) or to all archivers (arch ="").
• void getActiveData( const int64_t &tm = 0 ); — To interrogate the data source with forcing time-stamp to tm (not zero). Is used for periodic data acquisition by the active archives in the subsystem.
• void archivatorList( vector<string> &ls ); — List of archivers which serves the archive.
• bool archivatorPresent( const string &arch ); — Check the archiver for it's servicing of the given archive.
• void archivatorAttach( const string &arch ); — Connecting the archive to be served by the specified archiver.
• void archivatorDetach( const string &arch, bool full = false ); — Disabling this archive from the servicing of the specified archiver.
• void archivatorSort( ); — Sort of the serving archivers in the order of decreasing quality.
• string makeTrendImg( int64_t beg, int64_t end, const string &arch, int hsz = 650, int vsz = 230 ); — Building of the (pdf) image of the trend for the specified amount of time beg, end and for this archiver arch.
• TArchiveS &owner( ) const; — Subsystem "Archives" - the owner of the archive of values.

5.3 Object of the values' buffer (TValBuf)

Public methods:

• TValBuf( ); — Buffer initializer with default settings.
• TValBuf( TFld::Type vtp, int isz, int64_t ipr, bool ihgrd = false, bool ihres = false ); — Buffer initializer with the specified parameters.
• TValBuf( const TValBuf &src ); — Copying constructor.
• TValBuf &operator=( const TValBuf &src ); — Object copying.
• void clear( ); — Cleaning the buffer.
• TFld::Type valType( bool full = false ); — Type of the value stored in the buffer. full — request full type, else only generic.
• bool hardGrid( ); — Hard grid working mode.
• bool highResTm( ); — High resolution (microseconds) working mode of the buffer.
• bool fillLast( ); — Fill pass points to a last value. Mostly the pass values fill by EVAL but sometime the source's data periodicity greater to the archive's one and it is normal.
• int size( ); — Maximum buffer size (units).
• int realSize( ); — Real buffer size (units).
• int64_t period( ); — Frequency of values in the buffer (microseconds). If the frequency is zero the buffer operates in the mode of free access.
• int64_t begin( ); — Start time of the buffer (microseconds).
• int64_t end( ); — End time of the buffer (microseconds).
• bool vOK( int64_t ibeg, int64_t iend ); — Checking for values in the buffer for the specified period of time from ibeg to iend.
• void setValType( TFld::Type vl ); — Setting of the value type stored by the buffer.
• void setHardGrid( bool vl ); — Setting the hard grid mode.
• void setHighResTm( bool vl ); — High resolution (microseconds) working mode setting.
• void setFillLast( bool vl ); — Set to fill pass points to a last value.
• void setSize( int vl ); — Buffer size (units) setting.
• void setPeriod( int64_t vl ); — Frequency of values in the buffer (microseconds) setting.
• virtual void getVals( TValBuf &buf, int64_t beg = 0, int64_t end = 0 ); — Request of the values' frame buf for the time from beg to end.
• TVariant get( int64_t *tm = NULL, bool up_ord = false ); — Request value for the time tm and with the sign of moving to the top up_ord.
• virtual string getS( int64_t *tm = NULL, bool up_ord = false ); — Request of the string type value for the time tm and with the sign of moving to the top up_ord.
• virtual double getR( int64_t *tm = NULL, bool up_ord = false ); — Request of the real type value for the time tm and with the sign of moving to the top up_ord.
• virtual int64_t getI( int64_t *tm = NULL, bool up_ord = false ); — Request of the integer type value for the time tm and with the sign of moving to the top up_ord.
• virtual char getB( int64_t *tm = NULL, bool up_ord = false ); — Request of the boolean type value for the time tm and with the sign of moving to the top up_ord.
• virtual void setVals( TValBuf &buf, int64_t beg = 0, int64_t end = 0 ); — Setting the values' frame from buf fro the time from beg to end.
• void set( const TVariant &value, int64_t tm = 0 ); — Setting value with the time tm.
• virtual void setS( const string &value, int64_t tm = 0 ); — Setting the string type value with the time tm.
• virtual void setR( double value, int64_t tm = 0 ); — Setting the real type value with the time tm.
• virtual void setI( int64_t value, int64_t tm = 0 ); — Setting the integer type value with the time tm.
• virtual void setB( char value, int64_t tm = 0 ); — Setting the boolean type value with the time tm.

Protected methods:

• void makeBuf( TFld::Type v_tp, int isz, int64_t ipr, bool hd_grd, bool hg_res ); — Rebuilding the buffer for the specified parameters.

5.4 The modular object of the archiver's type (TTypeArchivator)

Public methods:

• void messList( vector<string> &list ) const; — The list of the messages' archivers.
• bool messPresent( const string &id ) const; — Check for the presence of the specified messages' archiver.
• string messAdd( const string &id, const string &idb = DB_GEN ); — Adding of the messages' archiver. Returns the end created identifier.
• void messDel( const string &id, bool full = false ); — Deleting of the messages' archiver.
• AutoHD<TMArchivator> messAt( const string &id ) const; — Connection to the messages' archiver.
• void valList( vector<string> &list ) const; — The list of the values' archivers.
• bool valPresent( const string &id ) const; — Check for the presence of the specified values' archiver.
• string valAdd( const string &id, const string &idb = DB_GEN ); — Adding of the values' archiver. Returns the end created identifier.
• void valDel( const string &id, bool full = false ); — Deleting of the values' archiver.
• AutoHD<TVArchivator> valAt( const string &id ) const; — Connection to the values' archiver.
• TArchiveS &owner( ) const; — Subsystem "Archives" - the owner of the archiver's type.

Protected methods:

• virtual TMArchivator *AMess( const string &id, const string &stor ); — Called when a new object of the message archiver is opened or created by this module with the identifier id and in the storage stor.
• virtual TVArchivator *AVal( const string &id, const string &stor ); — Called when a new object of the value archiver is opened or created by this module with the identifier id and in the storage stor.

5.5 The object of the messages' archiver (TMArchivator)

Public methods:

• TMArchivator( const string &id, const string &db, TElem *cf_el ); — Initializing constructor of the messages' archiver with the ID id, for the storage in the database db with the structure <cf_el>.
• string id( ); — Archiver's ID.
• string workId( ); — Working identifier, it includes the name of the module.
• string name( ); — Archiver's name.
• string dscr( ); — Archiver's description.
• bool toStart( ); — The sign "To start the archiver".
• bool startStat( ); — Archivers' status "Run".
• string &addr( ) const; — Address of the archiver's storage.
• int &level( ); — The level of messages, serviced by the archiver.
• void categ( vector<string> &list ); — Categories (templates) of messages, serviced by the archiver.
• string DB( bool qTop = false ) const; — Storage address of the archiver, qTop for the storage queue top.
• string tbl( ); — Table address of the archiver's DB.
• string fullDB( bool qTop = false ); — The full table address of the archiver's storage, qTop for the storage queue top.
• void setName( const string &vl ); — Setting the archiver's name.
• void setDscr( const string &vl ); — Setting the archiver's description.
• void setToStart( bool vl ); — Setting the sign "To start the archiver".
• void setAddr( const string &vl ); — Setting the address of the archiver's storage.
• void setLevel( int lev ); — Setting the level of messages, serviced by the archiver.
• void setDB( const string &vl, bool qTop = false ); — Setting the storage address of the archiver, qTop for the storage queue top.
• time_t redntTm( ); — Time of the last redundancy operation.
• bool redntUse( ); — Getting the data from the backup station mode.
• void setRedntUse( bool vl ); — Changing of the getting the data from the backup station mode.
• Redundant redntMode( ); — Redundancy mode ("<high>", "<low>", "<optimal>", {ForceStation}), enabling.
• void setRedntMode( Redundant vl ); — Setting of the redundancy mode, enabling.
• string redntRun( ); — Configuration of the preferred execution.
• void setRedntRun( const string &vl ); — Setting the configuration of the preferred execution.
• virtual void redntDataUpdate( ); — Operation of the data receiving from the backup station, called automatically by the service procedure of the redundancy scheme of the subsystem.
• virtual void start( ); — Starting the archiver object, the archiver starts for receiving messages and placing them into the storage.
• virtual void stop( ); — Stopping the archiver object.
• virtual time_t begin( ); — Begin time of the archiver data accordingly with the current state of the storage.
• virtual time_t end( ); — End time of the archiver data accordingly with the current state of the storage.
• virtual bool put( vector<TMess::SRec> &mess, bool force = false ); — Placing the message group mess to the archiver. Returns TRUE on the successful operation. Set force for direct writing to the archiver omit the redundancy.
• virtual time_t get( time_t bTm, time_t eTm, vector<TMess::SRec> &mess, const string &category = "", char level = 0, time_t upTo = 0 ); — Getting the messages to mess from the archiver for the specified filter parameters. Returns time of the request stop, useful for proceeding from this position as the end time, i.e. iteratively digging into the story. The filter specified by the time range [bTm...eTm], category rules, level and limited up to the time upTo. In the absence of a direct definition of the limiting time upTo, this limitation is set to prmInterf_TM — 7 seconds.
• TTypeArchivator &owner( ) const; — Archiver's type – the owner of the messages' archiver.

Protected attributes:

• bool runSt; — The sign "Running".
• int messHead; — The pointer to last read message of the messages buffer.

Protected methods:

• bool chkMessOK( const string &icateg, int8_t ilvl ); — Check the message to the filter conditions.

5.6 The object of the values' archiver (TVArchivator)

Public methods:

• TVArchivator( const string &id, const string &db, TElem *cf_el ); — Initializing constructor of the values' archiver with the ID id, for the storage in the database db with the structure cf_el.
• string id( ); — Archiver's ID.
• string workId( ); — Working identifier, it includes the name of the module.
• string name( ); — Archiver's name.
• string dscr( ); — Archiver's description.
• string addr( ) const; — Address of the archiver's storage.
• double valPeriod( ); — Frequency of values of the archiver (microseconds).
• int archPeriod( ); — Frequency of the values' archiving by the archiver. Time after which the archiver makes archiving of the frame of values from the archive's buffer.
• int selPrior( ); — Selection priority for mode "All" archivers.
• bool toStart( ); — The sign "To start the archiver".
• bool startStat( ); — Archivers' status "Run".
• string DB( bool qTop = false ) const; — Storage address of the archiver, qTop for the storage queue top.
• string tbl( ); — Table address of the archiver's DB.
• string fullDB( bool qTop = false ); — The full table address of the archiver's storage, qTop for the storage queue top.
• void setName( const string &inm ); — Setting the archiver's name.
• void setDscr( const string &idscr ); — Setting the archiver's description.
• void setAddr( const string &vl ); — Setting the address of the archiver's storage.
• void setValPeriod( double iper ); — Setting the frequency of values of the archiver (microseconds).
• void setArchPeriod( int iper ); — Setting the frequency of the values' archiving by the archiver. Time after which the archiver makes archiving of the frame of values from the archive's buffer.
• void setSelPrior( int vl ); — Set selection priority for mode "All" archivers.
• void setToStart( bool vl ); — Setting the sign "To start the archiver".
• void setDB( const string &vl, bool qTop = false ); — Setting the storage address of the archiver, qTop for the storage queue top.
• virtual void start( ); — starting the archiver object, the archiver starts for receiving values and placing them into the storage.
• virtual void stop( bool full_del = false ); — stopping the archiver object with the ability to completely remove its data from the storage at full_del.
• void archiveList( vector<string> &ls ); — The archive's list, serviced by the archiver.
• bool archivePresent( const string &iid ); — Check for the servicing of the specified archive by the specified archiver.
• TTypeArchivator &owner( ) const; — Archiver's type – the owner of the values' archiver.

Protected methods:

• TVArchEl *archivePlace( TVArchive &item ); — Add the archive item to the processing by the archiver.
• void archiveRemove( const string &id, bool full = false ); — Remove the archive id from the processing by the archiver, with the possibility of its full deleting full.
• virtual TVArchEl *getArchEl( TVArchive &arch ); — Getting the element object of the value archive for the specified archive arch.
• virtual void pushAccumVals( ); — Pushing the accumulated values by the archivation task, for the accumulative archivers.

Protected attributes:

• ResRW archRes; — Resource locker of the archiving process.
• bool runSt; — The sign "Archiver is run".
• bool endrunReq; — The sign "End run request to the archiver task".
• vector<TVArchEl *> archEl; — Array of elements of archives in the archiver.

5.7 The object of the archive's element in the archiver (TVArchEl)

Public methods:

• TVArchEl( TVArchive &iarchive, TVArchivator &iarchivator ); — Initializing constructor fro the connection the archive iarchive with the archiver iarchivator.
• virtual void fullErase( ); — Called to complete removal of the archive part in the archiver.
• virtual int64_t end( ); — End time in microseconds of the available values in the archive of the archiver.
• virtual int64_t begin( ); — Begin time in microseconds of the available values in the archive of the archiver.
• int64_t lastGet( ); — Time of last transfer of the data from the buffer to the storage.
• TVariant getVal( int64_t *tm, bool up_ord, bool onlyLocal = false ); — Request of the value for the time tm and with the sign of moving to the top up_ord, with the specifying of the request of only local archive in onlyLocal.
• void getVals( TValBuf &buf, int64_t beg = 0, int64_t end = 0, bool onlyLocal = false ); — Request of the values' frame buf for the time from beg to end, with the specifying of the request of only local archive in onlyLocal.
• void setVals( TValBuf &buf, int64_t beg = 0, int64_t end = 0, bool toAccum = false ); — Setting the values' frame from the buf for the time from beg to end, through the accumulation toAccum.
• TVArchive &archive( ); — Elements' archive.
• TVArchivator &archivator( ); — Elements' archiver.

Public methods:

• int64_t prev_tm; — The previous value time. It is used for averaging.
• string prev_val; — The previous value time. It is used for averaging.

Protected methods:

• virtual TVariant getValProc( int64_t *tm, bool up_ord ); — Requesting of one value from the archive for the time tm and fine-tuning to the upper value in the sampling grid up_ord.
• virtual void getValsProc( TValBuf &buf, int64_t beg, int64_t end ); — Requesting of a value group to buf from the archive and for the time range [beg...end].
• virtual void setValsProc( TValBuf &buf, int64_t beg, int64_t end, bool toAccum ); — Setting of the value group buf to the archive, for the time range [beg...end] and through the accumulation toAccum.

6 Subsystem "Transports"

"Transports" subsystem is represented by the TTransportS object, which contains modular objects of the transports' types TTypeTransport on the subsystem-level. Each type of transport contains objects TTransportIn of the input and TTransportOut of the output transports. The overall structure of the subsystem is shown in Fig. 6.

Fig. 6. Hierarchical structure of the subsystem "Transports".

The root object of the "Transports" subsystem's module provides information about the specific type of module and about the external OpenSCADA hosts/stations. As part of the single module it can be implemented the own general-module functionality. In general, for all modules, the access methods for both: inbound and outbound transports of the specific module are contained.

The object of the input transport TTransportIn provides an interface to the implementation of the modular method of input transport.

The object of the output transport TTransportOut provides an interface to the implementation of the modular method of output transport.

6.1 The object of the "Transports" subsystem (TTransportS)

Data:
Definitions of space the Transport subsystem (definition):

• STR_VER — Modules version (26);
• STR_ID — Identifier the subsystem ("Transport");
• STR_IN_PREF — Prefix of the input transports ("in_");
• STR_OUT_PREF — Prefix of the output transports ("out_");
• STR_A_PRM — Root XML-tag of the additional parameters ("prms");
• STR_A_PRM_CFGP — Prefix of the configuration parameters of the connection time ("CFG:").

External hosts mode (enum — TTransportS::ExtHost::Mode):

• User (0) — User.
• System (1) — System.
• UserSystem (2) — User and System.

The structure of the external OpenSCADA hosts/stations (class TTransportS::ExtHost):

• ExtHost( const string &iUserOpen, const string &iid, const string &iname = "", const string &itransp = "", const string &iaddr = "", const string &iuser = "", const string &ipass = "", uint8_t iUpRiseLev = 0 ); — Constructor of the structure initialization.
• string userOpen; — User who created the record about the external host/station.
• string id; — Id of the external host/station.
• string name; — Name of an external host/station.
• string transp; — Transport which is used to access an external host/station.
• string addr; — Address for the transport, which is used to access an external host/station.
• string user; — Users of the external host/station.
• string pass; — Password of the external host/station user.
• uint8_t upRiseLev; — External hosts uprising level/depth of this host/station.
• int8_t mode; — Host mode.
• time_t mdf; — Modification time.

Data types of the IO logs (enum — TTransportS::LogType):

• LTP_BinaryText (0) — Binary & Text.
• LTP_Binary (1) — Binary.
• LTP_Text (2) — Text.

Public methods:

• int subVer( ); — Subsystem's version.
• void inTrList( vector<string> &ls ); — Full list of input transports.
• void outTrList( vector<string> &ls ); — Full list of output transports.
• AutoHD<TTransportOut> outAt( const string &addr ); — Unified function of the output transport generic obtaining at that address addr in the form:

"{TrModule}.[out_]{TrID}[:{TrAddr}]" — typical output with automatic creation TrID at it missing and allowing TrAddr;

"{TrModule}.in_{TrID}:{RemConId}" — initiative input with the connection identifier in RemConId.

• string extHostsDB( ); — Database for the storing the list of external hosts.
• void extHostList( const string &user, vector<ExtHost> &list, bool andSYS = false, int upRiseLev = -1, const string &lang = "" ); — The list of external hosts for user, include system andSYS, the uprising level upRiseLev (-1 - starting from the host's entry level) and for the language lang.
• ExtHost extHostGet( const string &user, const string &id, bool andSYS = false ); — Getting the information object from the external host id on behalf of the user user, include system andSYS ( "*" — for the system hosts).
• ExtHost extHostSeek( const string &id, int lev ); — Direct hosts scanning at the station id and the level lev. The scanning starts at lev in 0 and stops at return empty host ID.
• AutoHD<TTransportOut> extHost( TTransportS::ExtHost host, const string &pref = "" ); — Creation - request of the output transport to service the external host host with the prefix of the identification of the system node pref.
• void extHostSet( const ExtHost &host, bool andSYS = false ); — Setting of the external host/station host, include system andSYS.
• void extHostDel( const string &user, const string &id, bool andSYS = false ); — Deleting of the external host/station id on behalf of the user user, include system andSYS ( "*" — for the system hosts).
• int cntrIfCmd( XMLNode &node, const string &senderPref, const string &user = "" ); — Transfer of the control area request of the OpenSCADA node to the remote station.
• void subStart( ); — Start of the subsystem.
• void subStop( ); — Stop of the subsystem.
• TElem &inEl( ); — DB structure of the input transports.
• TElem &outEl( ); — DB structure of the output transports.
• AutoHD<TTypeTransport> at( const string &id ) const; — Addressing/connection to the type of transport id.
• static TVariant prm( string &cnt, const string &id, const TVariant &val = TVariant(), bool toWr = false ); — Getting for value the addition parameter id with default one val, or setting to the value val at toWr. The additional parameters can store the connection time parameters at pointing id in the form "{id}\n{SRC}[\n{NAME}[\n{HELP}]]". The additional parameters stored in the XML-container cnt and this function used from TTransportIn::prm() and TTransportOut::prm() for the configuration field "A_PRMS" as a container.
• static string cntrCmdPrm( XMLNode *opt, const string &path, const string &cnt ); — Providing the OpenSCADA Control Interface in opt and path for the addition parameters in the input container. Changed container content is returned.

6.2 The modular object of the transports' type (TTypeTransport)

Public methods:

• virtual bool isNetwork( ); — The sign of network implementation by this module.
• void inList( vector<string> &list ) const; — The list of the input transports.
• bool inPresent( const string &id ) const; — Check for an input transport presence.
• string inAdd( const string &id, const string &db = DB_GEN ); — Addition of the input transport. Returns the end created identifier.
• void inDel( const string &id, bool complete = false ); — Deleting of the input transport. It is possible to completely delete with the database included, by setting the complete sign.
• AutoHD<TTransportIn> inAt( const string &id ) const; — Connection to the input transport.
• void outList( vector<string> &list ) const; — The list of the output transports.
• bool outPresent( const string &id ) const; — Check for an output transport presence.
• string outAdd( const string &id, const string &db = DB_GEN ); — Addition of the output transport. Returns the end created identifier.
• void outDel( const string &id, bool complete = false ); — Deleting of the output transport. It is possible to completely delete with the database included, by setting the complete sign.
• AutoHD<TTransportOut> outAt( const string &id ) const; — Connection to the output transport.
• virtual string outAddrHelp( ); — Address format help of the output transports.
• int outLifeTime( ); — Output transport lifetime, 0 for disable.
• void setOutKeepAliveTm( int vl ); — Set the output transport lifetime, 0 for disable.
• TTransportS &owner( ) const; — "Transports" subsystem - the owner of the transport's type.

Protected methods:

• virtual TTransportIn *In( const string &id, const string &stor ); — The modular method of the creating/opening of the new "input" transport.
• virtual TTransportOut *Out( const string &name, const string &stor ); — The modular method of the creating/opening of the new "output" transport.

6.3 The object of the input transports (TTransportIn)

Data:
Stages of the new Associated Output Transports processing (enum — TTransportIn::AssociateTrStage):

• ATrStg_Common (0) — common stage of default call stages ATrStg_Create, ATrStg_Proc; you can call stage ATrStg_Create, specific init the output transport and next call stage ATrStg_Proc to finish, and under the lock associateTrRes;
• ATrStg_Create (1) — creating and registering the representative output transport with addr is the transport address;
• ATrStg_Proc (2) — starting-connecting, reading the Initiate Connection ID, processing all presented associated transports.

Public methods:

• TTransportIn( const string &id, const string &db, TElem *el ); — Initializing constructor.
• string id( ); — Transport's Id.
• string workId( ); — Full ID including the ID of the module.
• string name( ); — Transport's name.
• string dscr( ); — Transport's description.
• string addr( ) const; — Address.
• string protocols( ); — Linked transport protocols.
• virtual unsigned keepAliveReqs( ); — Maximum Keep Alive requests.
• virtual unsigned keepAliveTm( ); — Keep Alive time.
• TVariant prm( const string &id, const TVariant &val = TVariant(), bool toWr = false ); — Getting for value the addition parameter id with default one val, or setting to the value val at toWr. The additional parameters can store the connection time parameters at pointing id in the form "{id}\n{SRC}[\n{NAME}[\n{HELP}]]". The additional parameters stored in XML of the configuration field "A_PRMS".
• TVariant conPrm( const string &id, const TVariant &val = TVariant(), const string &cfg = "" ); — Getting for value the connection time parameter id and setting the parameter at specifying the value val. If the connection time parameter also is a configuration from an external source, you specify the argument cfg in the form "{SRC}[\n{NAME}[\n{HELP}]]". Configuration of the external sources is read only by this function with setting the value val and configuration cfg once at initialisation, all changes for value the configuration performed by user from control interface of the transport.
• virtual string getStatus( ); — Getting the status of the input transport.
• bool toStart( ); — The sign "To start".
• bool startStat( ); — The status "Running".
• string DB( bool qTop = false ) const; — Transport's storage address, qTop for the storage queue top.
• string tbl( ) const; — Transport's DB table.
• string fullDB( bool qTop = false ) const; — Full name of the transport's storage table, qTop for the storage queue top.
• void setName( const string &inm ); — Setting the name of transport in inm.
• void setDscr( const string &idscr ); — Setting the description of transport in idscr.
• void setAddr( const string &addr ); — Setting the address of transport in addr.
• void setProtocols( const string &prt ); — Setting of the linked transport protocols.
• void clearConPrm( const string &id = "" ); — Clearing the connection time parameter id at non empty, all ones at empty and the external source configuration at "CFG:".
• void setToStart( bool val ); — Setting of the sign "To start".
• void setDB( const string &vl, bool qTop = false ); — Setting of the transport's storage address, qTop for the storage queue top.
• virtual void start( ); — Start of the transport.
• virtual void stop( ); — Stop of the transport.
• virtual int writeTo( const string &sender, const string &data ); — Sending data backward to the sender. Deprecated mostly and replaced by the polling mode of the input transport protocol, Initially implemented in transports with support of the initiative sending, not only at a request.
• vector<AutoHD<TTransportOut> > associateTrs( bool checkForCleanDisabled = false ); — The associated output transports massive, created by the input transport for typical requests to the connection initiator. Set checkForCleanDisabled for prior checking and clean up disabled ones.
• AutoHD<TTransportOut> associateTr( const string &id ); — Getting the associated output transport at that connection ID.
• TTypeTransport &owner( ) const; — Transport's type – the owner of the input transport.

Protected methods:

• string associateTrO( const string &addr, char stage = ATrStg_Common ); — The associated output transport creation with the address addr on the stage as an enumeration AssociateTrStage.
• int logLen( ); — length of the IO log.
• void setLogLen( int vl ); — set length of the IO log.
• void pushLogMess( const string &vl, const string &data = "", int dataDir = 0 ); — push the message vl with the data in the direction dataDir to the log in the format "{vl}\n{data}".

Protected attributes:

• bool runSt; — The sign "Running".
• ResMtx associateTrRes; — Resources lock of the associateTrO() stages AssociateTrStage.

6.4 The object of the output transports (TTransportOut)

Public methods:

• TTransportOut( const string &id, const string &db, TElem *el ); — Initializing constructor.
• bool isNetwork( ); — The sign — "The transport is network one", what is specified by the timeouts in seconds.
• bool isFromInput( ); — The sign of the output transport created by the input transport for the initiative connection.
• string id( ); — Transport's Id.
• string workId( ); — Full ID including the ID of the module.
• string name( ); — Transport name.
• string dscr( ); — Transport description.
• string addr( ) const; — Transport address.
• virtual string timings( ); — Transport timeouts.
• virtual unsigned short attempts( ); — Connection attempts.
• TVariant prm( const string &id, const TVariant &val = TVariant(), bool toWr = false ); — Getting for value the addition parameter id with default one val, or setting to the value val at toWr. The additional parameters can store the connection time parameters at pointing id in the form "{id}\n{SRC}[\n{NAME}[\n{HELP}]]". The additional parameters stored in XML of the configuration field "A_PRMS".
• TVariant conPrm( const string &id, const TVariant &val = TVariant(), const string &cfg = "" ); — Getting for value the connection time parameter id and setting the parameter at specifying the value val. If the connection time parameter also is a configuration from an external source, you specify the argument cfg in the form "{SRC}[\n{NAME}[\n{HELP}]]". Configuration of the external sources is read only by this function with setting the value val and configuration cfg once at initialisation, all changes for value the configuration performed by user from control interface of the transport.
• bool startStat( ); — Status "Running".
• time_t startTm( ); — Status "Time of starting/connection".
• int64_t lstReqTm( ); — Status "Last request time".
• virtual string getStatus( ); — Getting the status of the transport.
• string DB( bool qTop = false ) const; — Transport's storage address, qTop for the storage queue top.
• string tbl( ) const; — Transport's DB table.
• string fullDB( bool qTop = false ) const; — Full name of the transport's DB table, qTop for the storage queue top.
• void setName( const string &inm ); — Setting the name of transport.
• void setDscr( const string &idscr ); — Setting the description of transport.
• void setAddr( const string &addr ); — Setting the address of transport.
• virtual void setTimings( const string &vl, bool isDef = false ); — Setting the transport timeouts, as default one for isDef.
• virtual void setAttempts( unsigned short vl ); — Setting the connection attempts.
• void clearConPrm( const string &id = "" ); — Clearing the connection time parameter id at non empty, all ones at empty and the external source configuration at "CFG:".
• void setDB( const string &vl, bool qTop = false ); — Setting of the transport's storage address, qTop for the storage queue top.
• virtual void start( int time = 0 ); — Starting the transport with the connection timeout time. When you start the output transport the actual connection to the remote station is established for the interfaces that works by the connection. At this time the errors can occur if the connection is impossible and the transport should return to the stopped state.
• virtual void stop( ); — Stopping the transport.
• virtual int messIO( const char *obuf, int len_ob, char *ibuf = NULL, int len_ib = 0, int time = 0 ); — Sending of the data over the transport. The waiting timeout time of the connection in milliseconds. The time in negative disables the transport's request/respond mode and allows for the independently reading/writing to a buffer IO, with the reading timeout time in absolute.
• void messProtIO( XMLNode &io, const string &prot ); — Sending of the data in the XML tree in over the transport using the transport protocol prot.
• TTypeTransport &owner( ) const; — Type of transport - the owner of output transport.
• ResMtx &reqRes( ); — The requesting resource, needs to global lock into protocols with fragments receiving.

Protected methods:

• int logLen( ); — length of the IO log.
• void setLogLen( int vl ); — set length of the IO log.
• void pushLogMess( const string &vl, const string &data = "", int dataDir = 0 ); — push the message vl with the data in the direction dataDir to the log in the format "{vl}\n{data}".

Protected attributes:

• bool runSt; — The sign "Running".
• int64_t mLstReqTm; — The last request time.

7 Subsystem "Transport protocols"

Subsystem "Communication interfaces' protocols" is presented by the TProtocolS object, which contains modular objects of the separate protocols TProtocol on the a subsystem's level. Each protocol contains objects of the opened sessions of the input protocols TProtocolIn.

TProtocolS object provides an access to the both: the input and the output protocols of the individual types of transport protocols. The inner side of output protocol based on the steaming principle with the individual structure of the stream for each implementation of the protocol.

7.1 The object of the "Communication interfaces' protocols" subsystem (TProtocolS)

Public methods:

• int subVer( ); — Subsystem's version.
• AutoHD<TProtocol> at( const string &id ) const; — Connection to the protocol's id module.

7.2 The modular object of the protocol (TProtocol)

Public methods:

• virtual void itemListIn( vector<string> &ls, const string &curIt = "" ); — the list ls of the input protocol sub-elements from the current item curIt, if the protocol provides them. It is used when selecting an object in the input transport configuration.
• void list( vector<string> &list ) const; — The list of open input sessions.
• bool openStat( const string &name ) const; — Check for the openness of the input session with the specified name.
• void open( const string &name, TTransportIn *tr = NULL, const string &sender = "" ); — Opening of the session on behalf of the input transport tr.
• void close( const string &name ); — Closing of the input session.
• AutoHD<TProtocolIn> at( const string &name ) const; — Connecting to the open input sessions.
• virtual void outMess( XMLNode &io, TTransportOut &tro ); — The data transfer by the objects of the OpenSCADA core in the XML tree io to the remote system via the tro transport and the current output protocol. Presenting the data in the XML tree is non-standardized and specific to the logical structure of the protocol. This data are serialized — converted in a sequence of bytes according to the protocol, and are sent via the specified tro output transport by the messIO() function.

7.3 The object of the input protocol's session (TProtocolIn)

Public methods:

• TProtocolIn( const string &name ); — Initializing constructor.
• string name( ); — The name of the input session.
• AutoHD<TTransportIn> &srcTr( ) — The transport-source of the opening of the session of the input protocol.
• const string &srcAddr( ) — The sender address; second line contains service part of the address for backward messages.
• virtual unsigned waitReqTm( ); — The request waiting time on the input transport in milliseconds, call after what to the protocol with the empty message — the polling mode. Setting it to zero disable the polling mode.
• virtual void setSrcTr( TTransportIn *vl ) — Setting of the transport-source of the opening of the session of the input protocol.
• virtual void setSrcAddr( const string &vl ); — Setting of the sender address.
• int writeTo( const string &data ); — Sending the messages data backward to the sender, into srcAddr().
• virtual bool mess( const string &request, string &answer ); — transfer of the request data sequence to the protocol object for it parsing accordingly to the protocol implementation. The protocol function should process the request, generate the response in answer and return FALSE in the case of the completeness of the request. If the request is not complete, it is necessary to return TRUE for the transport to indicate the "expectation of the completion", the previous parts of the request should be saved in the context of the protocol object.
• TProtocol &owner( ) const; — The protocol, the owner of input sessions.

8 Subsystem "User interfaces"

The subsystem "User Interfaces" is presented by the TUIS object, which contains modular objects of the TUI user interfaces' on the subsystem's level.

8.1 The object of the "User interfaces" subsystem (TUIS)

Data:
Requests parameters (enum — GetOpts):

• GetPathURL (1) — Path get.
• GetContent (2) — Open document command get.

Public methods:

• int subVer( ); — Subsystem's version.
• void subStart( ); — Start of the subsystem.
• void subStop( ); — Stop of the subsystem.
• AutoHD<TUI> at( const string &name ) const; — Connects to the user's interface module.
• string fontSnthHglCode( ); — Getting the font name used in the syntax highlight for code.
• void setFontSnthHglCode( const string &val ) — Setting the font name used in the syntax highlight for code.
• static string icoGet( const string &inm, string *tp = NULL, bool retPath = false ); — Downloads image of the icon inm from standard directories or return path, on retPath, to allowed icon. Detecting icons for file extensions "png", "gif", "jpg", "jpeg", which return into tp.
• static string docGet( const string &inm, string *tp = NULL, unsigned opt = 0 ); — Downloads document inm from standard directories or return path, on retPath, to allowed document. Detecting documents for file extensions "pdf", "html", "odt", which return into tp.
• static string docKeyGet( const string &itxt ); — Gets the inline documentation key from the text itxt of a configuration field, often it is the node description and the key "DOC" in it.
• static string mimeGet( const string &inm, const string &fDt, const string &orig = "" ); — Gets file's mime type in view {group}/{type} for the file name inm, its content fDt and the original hint orig.

8.2 The modular object of the user interface (TUI)

Protected attributes:

• bool runSt; — The sign "Running".

9 Subsystem "Specials"

The subsystem "Specials" is presented by TSpecialS object, which contains modular objects of TSpecial special on the subsystem's level.

9.1 The object of the "Specials" subsystem (TSpecialS)

Public methods:

• int subVer( ); — Subsystem's version.

9.2 The modular object of the specials (TSpecial)

Protected attributes:

• bool runSt; — The sign "Running".

10 Subsystem "Security"

Security subsystem is presented by an object TSesurity, which contains group objects of TGroup and users TUser.

User object TUser contains user information and checks the authenticity of the user in accordance with the specified password.

TGroup user object contains information about the group of users and checks the user's belonging to the group.

10.1 The object of the "Security" subsystem (TSecurity)

Data (definition):

• SEC_HASH_MAGIC — String-pointer (prefix) of the passwords in the hash.

Public methods:

• bool access( const string &user, char mode, int owner, int groups, int access ); — Check the access of the user in the mode to the resource with the owner, groups (separated ',') and permition access.
• void usrList( vector<string> &list ) const; — The list of the users list.
• void usrGrpList( const string &name, vector<string> &list ); — The list of the users' groups list, in which the user name is included.
• bool usrPresent( const string &name ) const; — Check fro the presence of the specified user name.
• string usrAdd( const string &name, const string &db = DB_GEN ); — Addition of the user name with the saving to the DB db. Returns the end created name of the user.
• void usrDel( const string &name, bool complete = false ); — Deleting of the user name with the possibility of the completely deleting complete.
• AutoHD<TUser> usrAt( const string &name ) const; — Attaching of the user name.
• void grpList( vector<string> &list ) const; — The list of the users' groups list.
• bool grpPresent( const string &name ) const; — Check fro the presence of the specified users' group name.
• string grpAdd( const string &name, const string &db = DB_GEN ); — Addition of the users' group name with the saving to the DB db. Returns the end created name of the user group.
• void grpDel( const string &name, bool complete = false ); — Deleting of the users' group name with the possibility of the completely deleting complete.
• AutoHD<TGroup> grpAt( const string &name ) const; — Connection to the users' group name.

10.2 The user's object (TUser)

Public methods:

• TUser( const string &name, const string &db, TElem *el ); — Initialising constructor.
• string name( ); — User name.
• string descr( ); — User description.
• string longDescr( ); — User long description.
• string picture( ); — User image.
• string lang( ); — User language, only into the dynamic translation text variables mode.
• bool sysItem( ); — Sign of the system user.
• bool auth( const string &pass, string *hash = NULL ); — Check the authenticity of the user by the password pass. The password hash, if it is supports, placing into the hash.
• int permitCmpr( const string &user ); — Comparing the user permition with the user object. Returns -1 for lesser, 1 for greater and 0 for even permition.
• string DB( bool qTop = false ) const; — User storage address, qTop for the storage queue top.
• string tbl( ) const; — Address of the table of user's storage.
• string fullDB( bool qTop = false ) const; — Full name of the table of user's storage, qTop for the storage queue top.
• void setDescr( const string &vl ); — Setting user's description to vl.
• void setLongDescr( const string &vl ); — Setting user's long description to vl.
• void setPicture( const string &pct ); — Setting user's image to pct.
• void setLang( const string &vl ); — Setting user's language to vl.
• void setPass( const string &pass ); — Setting user's password to pass.
• void setSysItem( bool vl ); — Setting the sign of system user to vl.
• void setDB( const string &vl, bool qTop = false ); — Setting the user's storage address, qTop for the storage queue top.
• TSecurity &owner( ) const; — "Security" subsystem - the owner of the user.

10.3 The users' group object (TGroup)

Public methods:

• TGroup( const string &name, const string &db, TElem *el ); — Initializing constructor.
• string name( ); — Users group name.
• string descr( ); — Users group description.
• string longDescr( ); — Users group long description.
• bool sysItem( ); — The sign of the system user.
• string DB( bool qTop = false ) const; — Users' group storage address, qTop for the storage queue top.
• string tbl( ) const; — Address of the table of the users' group DB.
• string fullDB( bool qTop = false ) const; — Full name of the table of the users' group storage, qTop for the storage queue top.
• void setDescr( const string &vl ); — Setting users group description to vl.
• void setLongDescr( const string &vl ); — Setting users group long description to vl.
• void setDB( const string &vl, bool qTop = false ); — Setting the users' group storage address, qTop for the storage queue top.
• bool user( const string &name ); — Check for the user's belonging to the group name.
• void userAdd( const string &name ); — Addition of the user name to the group.
• void userDel( const string &name ); — Deleting of the user name from the group.
• TSecurity &owner( ) const; — "Security" subsystem - the owner of the users' group.

11 Subsystem "Modules scheduler"

Subsystem “Modules' sheduling” is presented by the object TModSchedul.

The subsystem contains the control mechanism for modules contained in shared libraries.

11.1 The object of the subsystem "Modules' sheduling" (TModSchedul)

Data:
The structure of information about the shared library (struct – TModSchedul::SHD):

• void *hd; — the title of the shared library (if NULL, the library is present, but not connected);
• vector<string> use; — list of connected modules;
• time_t tm; — modification time of the library;
• string name; — full name/path of the shared library.

Public methods:

• string allowList( ) const; — The list of permitted shared libraries (modules).
• string denyList( ); — The list of prohibited shared libraries (modules).
• int chkPer( ); — The verification period of the directory with the modules (s).
• void setAllowList( const string &vl ); — Setting of the list of permitted shared libraries (modules).
• void setDenyList( const string &vl ); — Setting of the list of prohibited shared libraries (modules).
• void setChkPer( int per ); — Setting the verification period of the directory with the modules (s). If the frequency is equal to zero, the check will be disabled.
• void subStart( ); — Subsystem's start.
• void subStop( ); — Subsystem's stop.
• int loadLibS( ); — Loading the shared libraries and initialization of the modules. Return numbers loaded modules.
• SHD &lib( const string &name ); — Getting the shared library object name.
• void libList( vector<string> &list ); — The list of shared libraries list.
• int libLoad( const string &path, bool full ); — Loading the shared libraries from the specified path path. Return numbers loaded modules.
• void libAtt( const string &name, bool full = false); — Attaching of the specified shared library name.
• void libDet( const string &name ); — Detaching of the specified shared library name.

12 Components of the object model of OpenSCADA

Object model of OpenSCADA is based on the function object TFunction, on the parameters of the function IO and on the values' frame of the function TValFunc. Later the function's objects are included in the object tree, forming an object model of the system. Using the functions of the object model is made by linking the frame of values TValFunc with function.

The idea in general is shown in Fig. 7.

Fig. 7. Basis of the programming area of OpenSCADA.

Object of the function (TFunction) provides an interface for the formation of function parameters and algorithm of the computing in the object which inherits it.

Object of the function's parameter (IO) contains the configuration of the single parameter.

Object of the values' frame (TValFunc) contains values in accordance with the structure of the linked function. While the execution of the algorithm by the associated function the values of this object are used.

12.1 The function object (TFunction)

Public methods:

• TFunction( const string &id, const char *grp = "root", const string &istor = "" ); — Initializing constructor of the function with the identifier id, users group grp and storage stor.
• TFunction( const TFunction &src ); — Copying constructor.
• TFunction &operator=( const TFunction &func ); — Copying of functions.
• string id( ) const; — Function ID.
• virtual string name( ); — Localized name of the function.
• virtual string descr( ); — Description of the function.
• virtual string prog( ); — Program's text of the function, for no static ones.
• virtual string stor( ); — Storage DB, for table "Trs" mostly.
• bool startStat( ) const; — Status - "Running".
• int use( ); — Counter of the function's using.
• ResRW &fRes( ); — Link to the resource of the function.
• void setId( const string &vl ); — Set the function identifier.
• virtual void setProg( const string &prg ); — Set program's text of the function, for no static ones.
• void setStor( const string &istor ); — Set storage DB to stor.
• virtual void setStart( bool val ); — Start/stop val of the function.
• void ioList( vector<string> &list ); — The list of the function's parameters list.
• int ioId( const string &id ) const; — Getting the index of the function's parameter id.
• int ioSize( ) const; — The quantity of the function's parameters.
• IO *io( int id ) const; — Getting the function's parameter by the index id.
• int ioAdd( IO *io ); — Addition of the function's parameter io. Returns the actual position of the new IO.
• int ioIns( IO *io, int pos ); — Insert of the function's parameter io into the position pos. Returns the actual position of the new IO.
• void ioDel( int pos ); — Deleting the function's parameter in the position pos.
• void ioMove( int pos, int to ); — Moving the function's parameter from the position pos to the position to.
• virtual void calc( TValFunc *val ); — The calculation of the function's algorithm of the specified values val.
• virtual void valAtt( TValFunc *vfnc ); — Is called by the object of the values' frame vfnc in the case of attaching with the function.
• virtual void valDet( TValFunc *vfnc ); — Is called by the object of the values' frame vfnc in the case of detaching from the function.
• virtual void preIOCfgChange( ); — Is called before the changing of the configuration of the function.
• virtual void postIOCfgChange( ); — Is called after the changing of the configuration of the function.

Protected attributes:

• string mId; — Function ID.
• bool runSt; — Sign - "Running".
• bool beStart; — Sign - "Start".
• TValFunc *mTVal; — Reference to the values' object, used for testing the function. May be absent.

12.2 The object of the function's parameter (IO)

Data:
Parameter's type (enum — IO::Type):

• IO::String (0) — string/text;
• IO::Integer (1) — integer;
• IO::Real (2) — real;
• IO::Boolean (3) — boolean;
• IO::Object (4) — object.

Parameter's flags (enum — IO::IOFlgs):

• IO::Default (0x00) — default mode (input);
• IO::Output (0x01) — output;
• IO::Return (0x02) — return;
• IO::FullText (0x04) — full-text string;
• IO::Selectable (0x08) — selectable;
• IO::TransltText (0x1000) — being translated string, TPrmTempl reserves the flags range [0x10...0x0800].

Public methods:

• IO( const char *id, const char *name, IO::Type type, unsigned flgs, const char *def = "", bool hide = false, const char *rez = "" ); — Initializing constructor.
• IO( const IO &src ); — Copying constructor.
• IO &operator=( const IO &iio ); — Copying of the function parameters.
• const string &id( ) const; — ID of the function's parameter.
• string name( ) const; — The localized name of the function's parameter.
• const Type &type( ) const; — The type of the function's parameter.
• unsigned flg( ) const; — The flags of the function's parameter.
• const string &def( ) const; — Default value.
• bool hide( ) const; — Sign - "Hide".
• const string &rez( ) const; — The reserve property of the function's parameter.
• void setId( const string &val ); — Set the identifier to val.
• void setName( const string &val ); — Set the name to val.
• void setType( Type val ); — Set the type to val.
• void setFlg( unsigned val ); — Set the flags to val.
• void setDef( const string &val ); — Set the default value to val.
• void setHide( bool val ); — Set/unset the sign - "Hide".
• void setRez( const string &val ); — Set the reserve property to val.

12.3 The object of the function's value (TValFunc)

Public methods:

• TValFunc( const string &iname = "", TFunction *ifunc = NULL, bool iblk = true ); — Initializing constructor.
• bool blk( ); — The sign — "Blocking of the parameters' changes of the function".
• bool mdfChk( ); — The sign — "To check attributes to modify".
• bool isChangedProg( bool clear = false ); — The sign — "The program changing" with it clearing by clear.
• bool isCalc( ); — The sign — "The function calculation".
• string user( ); — User on whose behalf the function is executed.
• string lang( ); — Language on whose the function is executed.
• const string &vfName( ); — Name of the values' object.
• void setUser( const string &vl ); — Set the user on whose behalf the function will be executed.
• void setLang( const string &vl ); — Set the language on whose the function will be executed.
• void setVfName( const string &nm ); — Set the name of the values' object to nm.
• void setMdfChk( bool set ); — Set/unset set of the sign - "To check attributes to modify".
• void ioList( vector<string> &list ); — The list of the function's parameters list.
• int ioId( const string &id ); — Getting the parameter's index id.
• int ioSize( ) const; — The whole quantity of the parameters.
• IO::Type ioType( unsigned id ); — Parameter's type id.
• unsigned ioFlg( unsigned id ) const; — Parameter's flags id.
• bool ioHide( unsigned id ); — Parameter's sign id - "Hide".
• bool ioMdf( unsigned id ); — Parameter's sign id - "Modified".
• TVariant get( unsigned id ); — Get the value of the parameter id.
• string getS( unsigned id ); — Get the value (string) of the parameter id.
• int64_t getI( unsigned id ); — Get the value (integer) of the parameter id.
• double getR( unsigned id ); — Get the value (real) of the parameter id.
• bool getB( unsigned id ); — Get the value (boolean) of the parameter id.
• AutoHD<TVarObj> getO( unsigned id ); — Get the value of the parameter's object id.
• void set( unsigned id, const TVariant &val ); — Set the value val of the parameter id.
• void setS( unsigned id, const string &val ); — Set the value val (string) of the parameter id.
• void setI( unsigned id, int64_t val ); — Set the value val (integer) of the parameter id.
• void setR( unsigned id, double val ); — Set the value val (real) of the parameter id.
• void setB( unsigned id, bool val ); — Set the value val (boolean) of the parameter id.
• void setO( unsigned id, AutoHD<TVarObj> val ); — Set the value val of the parameter's object id.
• virtual void calc( const string &user = "" ); — To calculate on behalf of the user user or user, specified earlier.
• double calcTm( ); — Computation time.
• void setCalcTm( double vl ); — Initializing of the time of value's calculation vl.
• TFunction *func( ); — Attached function.
• void setFunc( TFunction *func, bool att_det = true ); — To attach with the specified function func.
• virtual void preIOCfgChange( ); — Is called before the configuration changes.
• virtual void postIOCfgChange( ); — Is called after the configuration changes.
• virtual void progChange( ); — Is called at the program changing.
• TValFunc *ctxGet( int key ); — Get context for key key.
• void ctxSet( int key, TValFunc *val ); — Set context for key key.
• void ctxClear( ); — External functions call context clear.

Public attributes:

• void *exCtx; — The function execution context.

13 Data in OpenSCADA and their storage

Storing data in the program is based on the objects TConfig and TElem. These objects store the structure and field values of the storage, allowing for direct loading and saving the configuration via the "DB" subsystem. For the specialised different types of the data storage the TVariant object is provided.

The TElem object contains the structure of database record. Structure of the record contains extensive information about the elements, their types, sizes and other parameters. Information in that structure is enough to create, control and manage the real structure of the database. Elementary unit of the record is the cell TFld.

The TConfig object is the heir of TElem and contains the actual values of elements. TConfig is used as the parameter in the functions of the manipulating with the table records in the "DB" subsystem. Elementary unit of the record is the cell TCfg.

To provide an opportunity to inform the data storehouse about the changes in the structure it is provides an object TValElem, from which it is inherited the storehouse TConfig and the list of which is contained in the TElem structure.

13.1 Data storing conception

OpenSCADA commonly defines and uses as the storage only the Configuration File and the Data Bases of different types of the "DB" subsystem. Where the Configuration File has the highest priority as an obligatory and always present storage.

The Generic Storage is a common system configuration field of selection a storage for common program data and as default storage value of OpenSCADA nodes to store. As the Generic Storage there can be selected whether the Configuration File "<cfg>" or a DB "{DB module}.{DB name}", and the same is pointed as "<gen>" for enabling the implicit data accessing method in OpenSCADA nodes.

There are provided two variants of the data accessing:

1. directly and exclusively at the specified storage name;
2. implicitly at specifying the Generic Storage name "<gen>", what commonly means of accessing to the Configuration File firstly and the Generic Storage DB secondary, at the data missing in the Configuration File.

The "DB" subsystem (the class TBDS) provides the functions dataSeek(), dataGet(), dataSet(), dataDel() of accessing the data which perform the data accessing variants in such ways:

• dataSeek() — the data seeking function:

1. seeking data only the directly specified storage;
2. throughout seeking the Configuration File and the Generic Storage DB.

• dataGet() — the data getting function:

1. getting data only the directly specified storage;
2. getting the present data in the Configuration File, next the Generic Storage DB data at missing in the Configuration File.

• dataSet() — the data setting function:

1. setting data only to the directly specified storage;
2. setting the present data in the Configuration File, next the Generic Storage DB data at missing in the Configuration File; provides the flag TBDS::OnlyCfg support to force the new data creation in the Configuration File.

• dataDel() — the data deleting function:

1. deleting data only in the directly specified storage;
2. deleting the data both in the Configuration File and the Generic Storage DB.

The testing scenarios of the data accessing:

• creating and loading to/from the work Data Base of the Generic Storage: DB, Security.{User,Group}, Transport.{Input,Output}, ExtTansp, DAQ.{Controller,TemplateLib}, Archives.{VArchive,VArchiver,MArchiver}, DAQ.JavaLikeCalc.Lib, Protocol.{ModBus,OPC_UA,UserProtocol}.*, UI.WebUser.Page, UI.VCAEngine.{WdgLib,Proj}.
• saving and loading to/from the Configuration File of the Generic Storage (with presence in the work Data Base): DB, Security.{User,Group}, Transport.{Input,Output}, ExtTansp, DAQ.{Controller,TemplateLib}, Archives.{VArchive,VArchiver,MArchiver}, DAQ.JavaLikeCalc.Lib, Protocol.{ModBus,OPC_UA,UserProtocol}.*, UI.WebUser.Page, UI.VCAEngine.{WdgLib,Proj}.
• complete removing from the Generic Storage (both the Configuration File and the work Data Base): DB, Security.{User,Group}, Transport.{Input,Output}, ExtTansp, DAQ.{Controller,TemplateLib}, Archives.{VArchive,VArchiver,MArchiver}, DAQ.JavaLikeCalc.Lib, Protocol.{ModBus,OPC_UA,UserProtocol}.*, UI.WebUser.Page, UI.VCAEngine.{WdgLib,Proj}.
• creating and loading directly to/from the library Data Base: Security.{User,Group}, Transport.{Input,Output}, DAQ.{Controller,TemplateLib}, Archives.{VArchive,VArchiver,MArchiver}, DAQ.JavaLikeCalc.Lib, Protocol.{ModBus,OPC_UA,UserProtocol}.*, UI.WebUser.Page, UI.VCAEngine.{WdgLib,Proj}.
• saving directly to the Configuration File, removing from the library Data Base and loading from the Configuration File: Security.{User,Group}, Transport.{Input,Output}, DAQ.{Controller,TemplateLib}, Archives.{VArchive,VArchiver,MArchiver}, DAQ.JavaLikeCalc.Lib, Protocol.{ModBus,OPC_UA,UserProtocol}.*, UI.WebUser.Page, UI.VCAEngine.{WdgLib,Proj}.
• removing from the Configuration File as a main part of the Generic Storage: Security.{User,Group}, Transport.{Input,Output}, DAQ.{Controller,TemplateLib}, Archives.{VArchive,VArchiver,MArchiver}, DAQ.JavaLikeCalc.Lib, Protocol.{ModBus,OPC_UA,UserProtocol}.*, UI.WebUser.Page, UI.VCAEngine.{WdgLib,Proj}.

13.2 Data object (TConfig)

Public methods:

• TConfig( TElem *Elements = NULL ); — Initializing constructor.
• TConfig( const TConfig &src ); — Copying constructor.
• TConfig &operator=( const TConfig &cfg ); TConfig &exclCopy( const TConfig &cfg, const string &passCpLs = "", bool cpElsToSingle = false ); — Copying from cfg, passing fields into passCpLs and creating same this fields cpElsToSingle for combined configurations.
• void cfgList( vector<string> &list ) const; — Elements' list list.
• bool cfgPresent( const string &n_val ) const; — Check for the element's presence n_val.
• TCfg &cfg( const string &n_val ) const; — Getting of th element n_val.
• TCfg *at( const string &n_val, bool noExpt = false ) const; — Getting of the element's pointer n_val. If the element is absent an exception is generated or the null pointer is returned when setting noExpt.
• void cfgViewAll( bool val = true ); — Set/unset the sign of the visibility for all the elements.
• void cfgKeyUseAll( bool val ); — Set/unset the sign of the using the key for all the elements.
• void cfgToDefault( ); — Setting all not key and view fields to the default value.
• TElem &elem( ); — The using structure.
• void setElem( TElem *Elements, bool first = false ); — Setting the structure in Elements.
• void cntrCmdMake( XMLNode *fld, const string &path, int pos, const string &user = "root", const string &grp = "root", int perm = 0664 ); — Formation of the information description of elements of the configuration for the management interface of OpenSCADA.
• void cntrCmdProc( XMLNode *fld, const string &elem, const string &user = "root", const string &grp = "root", int perm = 0664 ); — Requests' of the OpenSCADA management interface to the elements of the configuration processing.
• bool incomplTblStruct( ); — The DB struct incomplete flag.
• void setIncmplTblStrct( bool vl ); — Setting the DB struct incomplete flag to vl.
• bool reqKeys( ); — The sign "Requests key", mark for using the request keys by the group items.
• bool trcSet( ) const; — The setting elements tracing.
• void setTrcSet( bool vl ); — Setting the setting elements tracing, at setting TRUE all marks of the items setting are cleared.
• bool noTransl( ) const; — The sign "No translation" is provided to disable the translation of all text variables of the record by default.
• void setNoTransl( bool vl ); — Setting of the sign "No translation".
• TVariant objFunc( const string &id, vector<TVariant> &prms, const string &user_lang, int perm, const string &owner ); — User API object functions of accessing to the configuration with the permition control.

Protected methods:

• virtual bool cfgChange( TCfg &co, const TVariant &pc ); — Is called in the case of changing the contents of the configuration element.

13.3 Data cell (TCfg)

Data:
Additional flags to #TFld (enum — TCfg::AttrFlg):

• TCfg::NoVal(0x100) — Do not reflect an element on the value of the TValue object.
• TCfg::Key(0x200) — key field.
• TCfg::Hide(0x400) — attribute is hidden.

Requests flags (enum — ReqFlg):

• TFld::ForceUse(0x01) — Forcing the setting of the flag of the element's using during the setting of its value.
• TFld::ExtValOne (0x02) — One/first (and default) value: set value for key.
• TFld::ExtValTwo (0x04) — Two/second value: base value for the key request or set.
• TFld::ExtValThree (0x08) — Three value: source address for translations.

Public methods:

• TCfg( TFld &fld, TConfig &owner ); — Initializing constructor.
• TCfg( const TCfg &cfg ); — Copy constructor.
• const string &name( ); — Cell name.
• bool operator==( TCfg &cfg ); — Comparison of the cells.
• TCfg &operator=( const TCfg &cfg ); — Copying of the cells.
• bool view( ) const; — The sign - "Cell is visible".
• bool keyUse( ) const; — The sign - "Use the key" for the dataSeek() and dataDel() requests.
• bool noTransl( ) const; — The sign "No translation" is provided to disable the translation of text variables for the record.
• bool reqKey( ) const; — The sign "Requests key", for group operations produce by the field as key.
• bool isKey( ) const; — Common sign of the field as key, depends from mode "Requests key" for the group.
• bool extVal( ) const; — The sign "Extended value", for mark the field to misc role for search and update the key value and translation.
• bool isSet( ) const; — The setting element sign.
• void setView( bool vw ); — Setting of the sign "The cell is visible" в vw.
• void setKeyUse( bool vl ); — Setting of the sign "Use the key" in vl.
• void setNoTransl( bool vl ); — Setting of the sign "No translation".
• void setReqKey( bool vl, bool treatDep = true ); — Setting of the sign "Requests key", treating the dependencies by treatDep.
• void setExtVal( bool vw ); — Setting of the sign "Extended value".
• void setIsSet( bool vl ); — Setting the setting element sign.
• void toDefault( bool notSetType = false ); — Setting the field value to the default one, and without setting the field type at notSetType.
• TFld &fld( ) const; — Configuration of the cell.
• string getS( ) const; string getS( uint8_t RqFlg ); — Get the value of the string type with the request flags RqFlg.
• const char *getSd( ); — Get the direct access to the string type value.
• double &getRd( ); — Get the direct access to the real type value.
• int64_t &getId( ); — Get the direct access to the integer type value.
• char &getBd( ); — Get the direct access to the boolean type value.
• void setS( const string &val ); TCfg &operator=( const string &vl ); TCfg &operator=( const char *vl ); void setS( const string &val, uint8_t RqFlg ); — Set the value of the string type to the val with the request flags RqFlg.
• void setR( double val ); TCfg &operator=( double vl ); void setR( double val, uint8_t RqFlg ); — Set the value of the real type to the val with the request flags RqFlg.
• void setI( int64_t val ); TCfg &operator=( int64_t vl ); void setI( int64_t val, uint8_t RqFlg ); — Set the value of the integer type to the val with the request flags RqFlg.
• void setB( char val ); TCfg &operator=( bool vl ); void setB( char val, uint8_t RqFlg ); — Set the value of the boolean type to the val with the request flags RqFlg.
• TConfig &owner( ) const; — The object of container-owner.

13.4 Data structure object (TElem)

Public methods:

• TElem( const string &name = "" ); — Initialization of the structure with the specified name name.
• TElem( const TElem &src ); — Copying constructor.
• TElem &operator=( const TElem &src ); — Copying from src.
• string &elName( ); — The name if the structure.
• void fldList( vector<string> &list ) const; — The cell's list in the structure list.
• unsigned fldSize( ) const; — The number of cells in the structure.
• unsigned fldId( const string &name, bool noex = false ); — Getting the index of the cell from its identifier name. Set noex on no the cell present caused return overall cells number, without exception generation.
• bool fldPresent( const string &name ); — Check for the presence of the specified cell name.
• int fldAdd( TFld *fld, int id = -1 ); — Addition/insert of the cell fld to the position id (-1 — insert to the end).
• void fldDel( unsigned int id ); — Deleting of the cell id.
• TFld &fldAt( unsigned int id ) const; — Getting of the cell id.
• void fldClear( ); — Removing all cells.
• void valAtt( TValElem *cnt ); — Is called automatically when the structure is attached to the data storage cnt.
• void valDet( TValElem *cnt ); — Is called automatically when the structure is detached from the data storage cnt.
• ResMtx &resEl( ); — Mutex for access to containers of the fields.
• unsigned contN( ); — Counter of the connected containers.

13.5 Data structure cell (TFld)

Data:
Cell's type (enum – TFld::Type):

• TFld::Boolean(0) — boolean type;
• TFld::Integer(1) — integer type;
• TFld::Real(4) — real type;
• TFld::String(5) — string type;
• TFld::Object(6) — object type.
• TFld::GenMask(0x0F) — generic types mask;
• TFld::Int16(0x11) — signed integer 16 bits;
• TFld::Int32(0x01) — signed integer 32 bits;
• TFld::Int64(0x21) — signed integer 64 bits;
• TFld::Float(0x14) — float (4 bytes);
• TFld::Double(0x04) — double (8 bytes).

Cell's flags (enum — TFld::AttrFlg):

• TFld::NoFlag(0x00) — No flags;
• TFld::Selectable(0x01) — selection mode from the available values, the selectable type;
• TFld::SelfFld(0x02) — To create the own copy of this cell;
• TFld::NoWrite(0x04) — unwritable;
• TFld::HexDec(0x08) — integer type: hexadecimal notation;
• TFld::OctDec(0x10) — integer type: octal notation;
• TFld::DateTimeDec(0x20) — integer type: содержит дату в UTC;
• TFld::FullText(0x08) — Full-text, multi-string mode of the text type;
• TFld::TransltText(0x10) — Translate the text variables of the record.

Public methods:

• TFld( ); — Initialization by default.
• TFld( const TFld &ifld, const char *name = NULL ); — Copying constructor, with possibility for individual name set.
• TFld( const char *name, const string &descr, Type type, unsigned flg, const char *valLen = "", const char *valDef = "", const string &vals = "", const string &nSel = "", const char *res = "" ); — Initialization with the specified configuration.
• TFld &operator=( const TFld &fld ); — Copy of the cell from fld.
• const string &name( ) const; — Cell's name.
• string descr( ) const; — Cell's description.
• string lenS( ) const; — Combined string variant of the length field in the form "{len}.{dec}".
• int len( ) const; — Size of the cell's value (symbols in symbolic representation).
• int dec( ) const; — Size of the fractional part of a real (symbols in symbolic representation).
• Type type( ) const; — Cell's type.
• static Type type(IO::Type tp); — Cell's type from IO::Type type.
• IO::Type typeIO( ) const; — Cell's type in IO::Type.
• unsigned flg( ) const; — Cell's flag.
• const string &def( ) const; — Default value.
• string values( ) const; — Working range of the value or a list of possible values for the selectable type (as — "vl1;vl2;vl3").
• string selNames( ) const; — List of names of values for the selectable type (as — "Value 1;Value 2;Value 3").
• const string &reserve( ) const; — Reserve parameter.
• void setDescr( const string &dscr ); — Set the descrition to the dscr.
• void setLen( int vl ); — Set the cell's size to the vl.
• void setDec( int vl ); — Set the fraction part of the real to the vl.
• void setDef( const string &def ); — Set the default value to the def.
• void setFlg( unsigned flg ); — Set the flags to flg.
• void setValues( const string &vls ); — Set the working range of value or the list of possible values for the selectable type (as — "vl1;vl2;vl3") to the vls.
• void setSelNames( const string &slnms ); — Set the list of values' names for the selectable type (as — "Value 1;Value 2;Value 3") to the slnms.
• void setReserve( const string &ires ); — Set of the reserve parameter to res.
• XMLNode *cntrCmdMake( XMLNode *opt, const string &path, int pos, const string &user = "root", const string &grp = "root", int perm = 0664 ); — Create a form element in accordance with the parameters of the cell.

13.6 The object which preacts about changing of the structure (TValElem)

Protected methods:

• virtual void detElem( TElem *el ); — Notification by the element el of the container about it's wish to detach.
• virtual void addFld( TElem *el, unsigned id ) = 0; — Notification about the addition of the cell id of the element el.
• virtual void delFld( TElem *el, unsigned id ) = 0; — Notification about the deleting of the cell id of the element el.

13.7 Data cell (TVariant)

Data:
Error values for the different data types (definition):

• EVAL_BOOL — Error value of the boolean type (2);
• EVAL_INT — Error value of the integer type (-2147483647);
• EVAL_REAL — Error value of the real type (-3.3E308);
• EVAL_STR — Error value of the string type ("<EVAL>").
• EVAL_INT16 — Error value of the integer 16 type (-32767);
• EVAL_INT32 — Error value of the integer 32 type (-2147483647);
• EVAL_INT64 — Error value of the integer 64 type (-9223372036854775807ll);
• EVAL_RFlt — Error value of the real type Float (-3.29E38f);
• EVAL_RDbl — Error value of the real type Double (-1.79E308).

Типы данных (enum — TVariant::Type):

• TVariant::Null — data type and data is not set.
• TVariant::Boolean — boolean type (boolean, 8бит).
• TVariant::Integer — integer type (integer, 32бит).
• TVariant::Real — real type (double).
• TVariant::String — string.
• TVariant::Object — object.

Public methods:

• TVariant( ); — Default constructor.
• TVariant( char ivl ); TVariant( bool ivl ); — Boolean type constructor.
• TVariant( int64_t ivl ); TVariant( int ivl ); — Integer type constructor.
• TVariant( double ivl ); — Real type constructor.
• TVariant( string ivl ); — String type constructor.
• TVariant( const char *var ); — String type constructor.
• TVariant( AutoHD<TVarObj> ivl ); TVariant( TVarObj *ivl ); — Object constructor.
• TVariant( const TVariant &var ); — Copying constructor.
• bool operator==( const TVariant &vr ) const; — Check the object for equality.
• bool operator!=( const TVariant &vr ) const; — Check the object for not equality.
• TVariant &operator=( const TVariant &vr ); — Copy of the object.
• bool isNull( ) const; — Signs that the object is not initiated.
• bool isEVal( ) const; — Value into the object is error.
• Type type( ) const; — Value's type.
• void setType( Type tp, bool fix = false, bool stdStringOmit = false ); — Set type tp for fixing it fix and use as constant allow stdStringOmit.
• bool isModify( ); — Modification flag. It serves in the object functions to indicate the modification of variables.
• void setModify( bool vl = true ); — Set of the modification flag.
• virtual char getB( ) const; operator char( ); — Getting the value as the boolean one.
• virtual int64_t getI( ) const; operator int64_t( ); operator int( ); — Getting the value as the integer one.
• virtual double getR( ) const; operator double( ); — Getting the value as the real one.
• virtual string getS( ) const; operator string( ); — Getting the value as the string one.
• virtual AutoHD<TVarObj> getO( ) const; operator AutoHD<TVarObj>( ); — Getting the object.
• virtual void setB( char val ); — Set to the value the boolean one.
• virtual void setI( int64_t val ); — Set to the value the integer one.
• virtual void setR( double val ); — Set to the value the real one.
• virtual void setS( const string &val ); — Set to the value the string one.
• virtual void setO( AutoHD<TVarObj> val ); — Set the object.

13.8 User object (TVarObj)

Public methods:

• TVarObj( ); — Constructor.
• int connect( ); — Connection to the object.
• int disconnect( ); — Disconnection from the object.
• virtual void propList( vector<string> &ls ); — Object's properties list ls.
• virtual TVariant propGet( const string &id ); — Request of the object property with an ID id.
• TVariant propGet( const string &ids, char sep ); — Request of the object hierarchical property with a path ids and separator sep.
• virtual void propSet( const string &id, TVariant val ); — Set the object property with an ID id to the value val.
• void propSet( const string &ids, char sep, TVariant val ); — Set the object hierarchical property with a path ids and separator sep to the value val.
• void propClear( const string &ids = "" ); — Property ids clear or all properties clear for empty ids.
• virtual string getStrXML( const string &oid = "" ); — Conversion of the contents of the object in the XML flow.
• static AutoHD<TVarObj> parseStrXML( const string &str, XMLNode *nd = NULL, AutoHD<TVarObj> prev = NULL ); — Backward serialization for XML-stream to object.
• virtual TVariant funcCall( const string &id, vector<TVariant> &prms ); — Call of the object function with the ID id and with the parameters prms.

14 Control Interface and dynamic tree of program objects

For complete coverage of the key components of the program by the network of objects the same structure, the object of the dynamic tree's node #TCntrNode is provided. The object provides the following functions:

• the unified access to the program components, including the dynamic access blocking;
• building the distributed control interface.

Any object that has the need to provide dynamic access to itself or its components, must be inherited from the object of the dynamic tree node #TCntrNode. This relationship is automatically includes the node into the dynamic tree of objects covered by both — the direct and the reverse links, and also provides an opportunity to create containers for its own child nodes. In addition to this, the node is able to preact the inclusion and exclusion/removing of the node from the tree with the possibility of reject from the exclusion/removal.

The Control Interface is included in the #TCntrNode object and it covers all nodes of the dynamic tree of the program, allowing uniform control of the program regardless of the client tool used. The Control Interface is made on the basis of the XML markup language and for which you can come up with many ways to use, for example, we note the following most indicative solutions:

• Web Interface of the configuration;
• GUI Interface of the configuration (Qt, WEB, ...);
• mirroring the objects configuration to the network for distributed management of a hierarchical network of OpenSCADA nodes from a common control environment;
• use as a protocol for accessing data of the objects from the network;
• providing other applications and individual components of OpenSCADA with service functions of access to internal data.

The Control Interface is implemented by the following components:

• information structure of the user configuration page;
• dynamic part in the form of requests for getting, setting of data and service requests;
• container-group of the above elements.

The information hierarchical structure contains information about public control elements and it can be used to build user dialogs of the node's control of the program.

The dynamic part contains scripts for servicing requests to the control elements, which are described in the information structure, and to hidden control elements in the form of service functions used for unified access to the node.

The container allows you to assemble several information structures and dynamic parts into one request, thereby optimizing the request time, especially on high-latency network interfaces.

The general Control Interface is built from individual nodes of the dynamic tree. Hierarchical inheritance from the object #TCntrNode allows you to implement multi-level addition of the configuration of the Control Interface. The view of the dynamic tree of nodes is shown in Figure 8.

Fig.8. An example of the dynamic tree of the nodes in OpenSCADA.

Nodes, containing data for the Control Interface, should also be connected to the dynamic object tree.

Connection of the node to the dynamic tree is done as follows:

• inheritance of the #TCntrNode object or its child;
• formation the information structure;
• servicing of the requests to the dynamic data.

14.1 Syntax of the request and response of the Control Interface

All exchange with the Control Interface takes place through the XML language. At the same time, the internal exchange is carried out by the parsed structure of the XML language, and the external exchange is carried out by converting into a symbol stream of the solid XML-file and back.

The request is made by sending a tag with parameters in the attributes. The result is placed into the resulting tag with some attributes modified. In general, the request tag can be written: <{req} path="{path}" user="{user}">{text}</{req}>. Where:

• req — request;
• path — path, consists directly of the path to the node and the address of a specific element in the information structure of the node, where the address of the specific element is also the path encoded for the "/" character in "%2f" and written by the last element-file of the common path, for example — "/sub_DAQ/mod_ModBus/cntr_testTCP/%2fcntr%2fcfg%2fNAME";
• user — user of the program on behalf of which the request is sent, usually sets automatically;
• text — text or result of the request.

The result of the request is marked in the response by setting the rez attribute to the value: 0-successful, 1-warning, 2-error. In the event of an error the message is written to the "text" of the tag and the attribute "mcat" (the message category) — <{req} path="{path}" user="{user}" rez="2" mcat="/sub_DAQ/mod_BlockCalc">Impossible to remove the node</{req}>. In the event of a warning the message is written to the attribute "mtxt" and the attribute "mcat" (the message category) with storing the main tag's data — <{req} path="{path}" user="{user}" rez="1" mcat="/sub_DAQ/mod_BlockCalc" mtxt="Restart after the operation!">{main data}</{req}>.

The grouping request "CntrReqs" is processed at the API level of the node and does not require separate processing in the user code. In fact, into the tag "CntrReqs" may be placed any other requests with the possibility of hierarchical grouping by including of the internal tags "CntrReqs". The only attribute of this tag is the attribute path, which indicates the path to the node and is the basis for internal requests.

<CntrReqs path="/sub_DAQ/cntr_gate">
  <get path="/%2fprm%2fcfg%2fNAME"/>
  <get path="/%2fprm%2fcfg%2fDESCR"/>
  <list path="/%2fserv%2fattr"/>
</CntrReqs>

14.2 Requesting the control information structure — <info user='{user}' lang='{lang}' path='{path}' />

The information request returns the hierarchical structure of the configuration provided by the node. The request usually does not contain the "path" attribute and extends to the entire node, although in complex cases of requesting a part of the information tree, the path of the element of the branch from which to receive the configuration can be specified.

The request will result in the information structure of the page according to the privileges of the requesting user — the fields of which are considered uniform and are described below with respect to the specifics of the information here, as well as the available commands. Everything outside the unification is considered service requests with a specific structure, which are described accordingly in the service functions section.

Tags of information elements provide mandatory attributes:

• id — identifier, by which the path to the element in command requests is formed;
• dscr — localized description according to the "lang" and the locale of the "user", directly used in the formation of the visual representation;
• acs — definition of access rights to the field by dynamic commands, which is written:

• 0 — no access at all, fields are deleted with such rights;
• 4 (SEC_RD) — read access;
• 2 (SEC_WR) — write access, usually this value does not make sense, since write access also implies read access;
• 6 (SEC_RD|SEC_WR) — read and write access.

That is, the lower three bits of the attribute "acs" number contain the actual access of the specified user, and the next three bits (3..5) contain the maximum possible rights, for example, 064(52) — is the maximum full access and actual only for reading.

Table. Table of all possible information elements in the structure.

The complex example of the informational structure:

<info lang="en" user="roman" rez="0"><oscada_cntr acs="36" dscr="OpenSCADA station: &quot;AGLCS&quot;" doc="Program_manual|Documents/Program_manual">
  <branches id="br" acs="36">
    <grp id='in_' descr='Input transport' acs='52' idSz='30' idm='50'/>
    <grp id='out_' descr='Output transport' acs='52' idSz='30' idm='50'/>
  </branches>
  <img id="ico" acs="36" />
  <area id="gen" acs="36" dscr="Station">
    <fld id="id" acs="36" dscr="Station" tp="str" help="Identifier" />
    <fld id="stat" acs="54" tp="str" help="Name" />
    <fld id="config" acs="36" dscr="Configuration file" tp="str" />
    <fld id="workdir" acs="36" dscr="Work directory" tp="str" dest="sel_ed" select="/gen/workDirList" />
    <fld id="moddir" acs="36" dscr="Modules directory" tp="str" dest="sel_ed" select="/gen/modDirList" />
    <area id="env" acs="36" dscr="Environment">
      <fld id="prog" acs="36" dscr="Program" tp="str" />
      <fld id="sys" acs="36" dscr="System" tp="str" len="30" />
      <fld id="time" acs="36" dscr="System time" tp="str" />
      <fld id="clk" acs="36" dscr="System planning clock" tp="str" />
      <fld id="user" acs="36" dscr="System user" tp="str" />
      <fld id="in_charset" acs="36" dscr="Language" tp="str" help="System locale charset." />
      <fld id="lang" acs="54" tp="str" dest="sel_ed" sel_list="en_US.UTF-8;uk_UA.UTF-8;ru_RU.UTF-8"
           help="Complete locale information with language, country and charset in the view &quot;en_GB.UTF-8&quot;." />
      <fld id="host" acs="36" dscr="Host name" tp="str" />
      <fld id="CPU" acs="36" dscr="CPU" tp="str" />
      <fld id="mainCPUs" acs="54" tp="str"
           help="Main CPUs set.&#010;To set up the processors you use, write a row of numbers separated by the character &#039;:&#039;.&#010;
Processor numbers start at 0." />
      <fld id="taskInvPhs" acs="54" dscr="Number of phases of the task invoking" tp="dec"
           help="To set up phasing of the task invoking in the determined phases number,&#010; &lt;= 0 to set optimal, 1 to disable the tasks phasing." />
    </area>
  </area>
  <area id="subs" acs="54" dscr="Subsystems">
    <list id="br" acs="36" dscr="Subsystems" idm="1" tp="br" br_pref="sub_" />
  </area>
  <area id="arch" acs="54" dscr="Archives">
    <table id="arch" acs="36" dscr="Archives">
      <list id="0" acs="36" dscr="Archive" tp="str" />
      <list id="1" acs="36" dscr="Period, seconds" tp="real" />
      <list id="2" acs="36" dscr="Buffer size" tp="dec" />
      <list id="3" acs="36" dscr="Last read buffer" tp="str" />
      <list id="4" acs="36" dscr="Files size" tp="str" />
    </table>
    <comm id="exp" acs="54" dscr="Export">
      <fld id="arch" acs="54" dscr="Archive" tp="str" dest="select" select="/arch/lst" />
      <fld id="beg" acs="54" dscr="Begin" tp="time" />
      <fld id="end" acs="54" dscr="End" tp="time" />
      <fld id="tfl" acs="54" dscr="Type" tp="str" dest="select" select="/arch/tpflst" />
      <fld id="file" acs="54" dscr="To file" tp="str" />
    </comm>
  </area>
</oscada_cntr></info>

14.3 Sending commands of the standard elements — <{cmd} path='{path}'>{text}</{cmd}>

The end configuration fields provide several commands starting from the dynamic information requesting and finishing the control commands. All these commands can be used in your internal procedures independently from requesting the information structure and for flexible OpenSCADA control both locally and remotely in any hierarchy by the User API function SYS.cntrReq().

Besides the unified command description for the standard elements you may need only the element path and which you can obtain in any OpenSCADA configurator what show the path in the status bar or context help. Any not unified behaviour of the specific standard fields means the service requests and that you can learn in the service functions section!

14.3.1 The configuration field — "fld"

Getting the data
REQ: <get path="{path}" />
RESP: <get path="{path}" rez="0">{value}</get>

• value — value of the field in the string form.

<get path="/sub_Security/usr_user/%2fprm%2fDESCR" rez="0" user="root">Simple user</get>

Setting the field
REQ: <set path="{path}">{value}</set>

• value — value of the setting in the string form.

<set path="/sub_Security/usr_user/%2fprm%2fDESCR">Renamed user</set>

Getting the syntax highlight rules of the text field
Allowed at the attribute "SnthHgl" setting in the corresponding information field.
REQ: <SnthHgl path="{path}" />
RESP: <SnthHgl path="{path}" rez="0">{rules tree}</get>

• rules tree — tree of the "rule" and "blk" tags which describes the syntax highlighting.

<SnthHgl font="monospace" path="/sub_DAQ/tmplb_base/tmpl_anUnif/%2fio%2fprog" rez="0" user="root">
  <rule color="darkgreen" expr="(&quot;(|\\{2}|\\{4}|\\{6}|\\{8})&quot;|&quot;.*[^\\](|\\{2}|\\{4}|\\{6}|\\{8})&quot;)" min="1">
    <rule color="green" expr="\\([xX][a-zA-Z0-9]{2}|[0-7]{3}|.{1})" font_weight="1" />
  </rule>
  <blk beg="/\*" color="gray" end="\*/" font_italic="1" />
  <rule color="gray" expr="//.*$" font_italic="1" />
  <rule color="darkblue" expr="\b(if|else|for|while|using|new|delete|break|continue|return|function|Array|Object|RegExp)\b" font_weight="1" />
  <rule color="darkblue" expr="\b(var|in)(?=\s+\w)" font_weight="1" />
  <rule color="darkblue" expr="(\?|\:)" font_weight="1" />
  <rule color="darkorange" expr="\b(0[xX][0-9a-fA-F]*|[0-9]*\.?[0-9]+|[0-9]*\.?[0-9]+[eE][-+]?[0-9]*|true|false)\b" />
  <rule color="darkblue" expr="(\=|\!|\+|\-|\&gt;|\&lt;|\*|\/|\%|\||\&amp;|\^|\~)" font_weight="1" />
  <rule color="blue" expr="(\;|\,|\{|\}|\[|\]|\(|\))" />
</SnthHgl>

14.3.2 The list field — "list"

Getting the data
REQ: <get path="{path}" />
RESP: <get path="{path}" rez="0">{elements list}</get>

• elements list — elements list in the tags "el", where the element name is in the tag text and the element identifier in the attribute "id" for lists with identifiers.

<get path="/sub_BD/mod_SQLite/%2fdb%2fodb" rez="0" user="root">
  <el id="GenDB">Main DB</el>
  <el id="OscadaLibs">OscadaLibs</el>
  <el id="vcaBase">vcaBase</el>
  <el id="vcaElectroEls">vcaElectroEls</el>
  <el id="vcaTest">vcaTest</el>
</get>

Adding the item
Allowed at "add" in the attribute "s_com" of the corresponding information field.
REQ: <add path="{path}" id="{itId}">{itName}</add>

• itName — name of the new item;
• itId — identifier of the new item for lists with identifiers.

  <add path="/sub_BD/mod_SQLite/%2fdb%2fodb" id="test">Test</add>

Inserting the item
Allowed at "ins" in the attribute "s_com" of the corresponding information field.
REQ: <ins path="{path}" pos="{pos}" p_id="{posId}" id="{itId}">{itName}</ins>

• itName — name of the new item;
• itId — identifier of the new item for lists with identifiers;
• pos — absolute position number of the selected-inserted item;
• posId — the selected item name, or identifier for lists with identifiers, in what position to insert the new item.

  <ins path="/sub_BD/mod_SQLite/%2fdb%2fodb" pos="1" p_id="OscadaLibs" id="test">Test</ins>

Removing the item
Allowed at "del" in the attribute "s_com" of the corresponding information field.
REQ: <del path="{path}" pos="{pos}" id="{itId}">{itName}</del>

• itName — name of the removed item;
• itId — identifier of the removed item for lists with identifiers;
• pos — absolute position number of the selected-removed item.

  <del path="/sub_BD/mod_SQLite/%2fdb%2fodb" id="test" />

Editing the item
Allowed at "edit" in the attribute "s_com" of the corresponding information field.
REQ: <edit path="{path}" pos="{pos}" p_id="{posId}" id="{itId}">{itName}</edit>

• itName — new name of the edited item;
• itId — new identifier of the edited item for lists with identifiers;
• pos — absolute position number of the selected-edited item;
• posId — the edited item name, or identifier for lists with identifiers.

  <edit path="/sub_BD/mod_SQLite/%2fdb%2fodb" p_id="test" id="test1">Test 1</edit>

Moving the item
Allowed at "move" in the attribute "s_com" of the corresponding information field.
REQ: <move path="{path}" pos="{pos}" to="{toPos}" />

• pos — absolute position number of the moved item;
• toPos — absolute position number for moving to.

  <move path="/sub_BD/mod_SQLite/%2fdb%2fodb" pos="5" to="4" />

14.3.3 The table field — "table"

Getting the data
REQ: <get path="{path}" />
RESP: <get path="{path}" rez="0">{elements lists}</get>

• elements lists — elements in the tags "el" packed in the "list" tags per column; each column tag "list" has identifier and own permitting, so some columns can be absent for some users.

<get path="/sub_DAQ/tmplb_base/tmpl_digitBlockUnif/%2fio%2fio" rez="0" user="root">
  <list acs="54" id="0">
    <el>com</el>
    <el>close</el>
    <el>stop</el>
    <el>st_open</el>
    <el>st_close</el>
    <el>tCmd</el>
    <el>last_cmd</el>
    <el>w_tm</el>
  </list>
  <list acs="54" id="1">
    <el>Command "Open"</el>
    <el>Command "Close"</el>
    <el>Command "Stop"</el>
    <el>State "Opened"</el>
    <el>State "Closed"</el>
    <el>Time to hold the command, seconds</el>
    <el>Last command</el>
    <el>Process command counter</el>
  </list>
  <list acs="54" id="2">
    <el>3</el>
    <el>3</el>
    <el>3</el>
    <el>3</el>
    <el>3</el>
    <el>1</el>
    <el>1</el>
    <el>2</el>
  </list>
  <list acs="54" id="3">
    <el>1</el>
    <el>1</el>
    <el>1</el>
    <el>0</el>
    <el>0</el>
    <el>0</el>
    <el>1</el>
    <el>1</el>
  </list>
  <list acs="54" id="4">
    <el>32</el>
    <el>32</el>
    <el>32</el>
    <el>16</el>
    <el>16</el>
    <el>0</el>
    <el>0</el>
    <el>0</el>
  </list>
  <list acs="54" id="5">
    <el>128</el>
    <el>128</el>
    <el>128</el>
    <el>128</el>
    <el>128</el>
    <el>64</el>
    <el>0</el>
    <el>0</el>
  </list>
  <list acs="54" id="6">
    <el>Crane|com</el>
    <el>Crane|close</el>
    <el>Crane|stop</el>
    <el>Crane|st_open</el>
    <el>Crane|st_close</el>
    <el>5</el>
    <el>0</el>
    <el>0</el>
  </list>
</get>

Setting for cell value of the specified row and column
Allowed at the SEC_WR permition.
REQ: <set path="{path}" row="{row}" key_{keyId}="{keyVal}" col="{colId}">{value}</set>

• row — absolute position of the operated row in the not key mode;
• keyId — identifier of the key listed in the attribute "key" of the corresponding information field in the key mode;
• keyVal — value of the key "keyId" for which the operation is performed;
• colId — identifier of the operated column;
• value — value of the setting in the string form.

<set path="/sub_DAQ/tmplb_base/tmpl_digitBlockUnif/%2fio%2fio" row="3" col="1">State "Opened" 1</set>

Adding the row
Allowed at "add" in the attribute "s_com" of the corresponding information field.
REQ: <add path="{path}" />

<add path="/sub_DAQ/tmplb_base/tmpl_digitBlockUnif/%2fio%2fio" />

Inserting the row
Allowed at "ins" in the attribute "s_com" of the corresponding information field.
REQ: <ins path="{path}" row="{row}" />

• row — absolute position of the new inserting row.

<ins path="/sub_DAQ/tmplb_base/tmpl_digitBlockUnif/%2fio%2fio" row="3" />

Deleting the row
Allowed at "del" in the attribute "s_com" of the corresponding information field.
REQ: <del path="{path}" row="{row}" key_{keyId}="{keyVal}" />

• row — absolute position of the deleted row in the not key mode;
• keyId — identifier of the key listed in the attribute "key" of the corresponding information field in the key mode;
• keyVal — value of the key "keyId" for which the operation is performed.

<del path="/sub_DAQ/tmplb_base/tmpl_digitBlockUnif/%2fio%2fio" row="3" />

Moving the row
Allowed at "move" in the attribute "s_com" of the corresponding information field.
REQ: <move path="{path}" row="{row}" to="{toRow}" />

• row — absolute position number of the moved row;
• toRow — absolute position number for moving to.

<move path="/sub_DAQ/tmplb_base/tmpl_digitBlockUnif/%2fio%2fio" row="12" to="3" />

User command to the row
Allowed at "{user}" in the attribute "s_com" of the corresponding information field.
REQ: <{user} path="{path}" row="{row}" key_{keyId}="{keyVal}" />

• user — user command name corresponding to the pointed one in the attribute "s_com";
• row — absolute position of the operated row in the not key mode;
• keyId — identifier of the key listed in the attribute "key" of the corresponding information field in the key mode;
• keyVal — value of the key "keyId" for which the operation is performed.

<remTrs path="/%2ftr%2fmess" key_base="BaseMess" />

14.3.4 The image field — "img"

Getting the data
REQ: <get path="{path}" />
RESP: <get path="{path}" rez="0" tp="{dataType}">{Base64 data}</get>

• dataType — data type;
• Base64 data — Base64 encoded binary data.

<get path="/sub_DAQ/%2fico" rez="0" tp="png" user="root">iVBORw0KGgoAAAANSUhEUgAAA...AABJRU5ErkJggg==</get>

Setting the data
Allowed at the SEC_WR permition.
REQ: <set path="{path}">{Base64 data}</set>

• Base64 data — Base64 encoded binary data.

<set path="/sub_DAQ/%2fico">iVBORw0KGgoAAAANSUhEUgAAA...AABJRU5ErkJggg==</set>

14.3.5 The command field — "comm"

Getting the link value
Actual only for links — the attribute "tp" is "lnk" of the corresponding information field.
REQ: <get path="{path}" />
RESP: <get path="{path}" rez="0">{lnkVal}</get>

• lnkVal — the actual link value, address to the other node in the control tree.

<get path="/sub_DAQ/mod_DAQGate/cntr_test/%2fcntr%2fcfg%2fhost_lnk" lang="en" user="roman" rez="0">/Transport</get>

Invoking the command
Allowed at the SEC_WR permition.
REQ: <set path="{path}">{fields}</set>

• fields — the command fields in the "fld" tags.

<set path="/sub_Archive/mod_FSArch/val_1s/%2farch%2fexp" lang="en">
  <fld id="arch">CPULoad_load</fld>
  <fld id="beg">1673942400</fld>
  <fld id="end">1673944800</fld>
  <fld id="tfl">ascii</fld>
  <fld id="file">testComm</fld>
</set>

14.4 Service commands-functions

Service functions are an interface for accessing OpenSCADA from external systems through the Control Interface. This mechanism is the basis of all exchange within OpenSCADA, implemented through weak links and OpenSCADA's own exchange protocol. Its main advantage is priority processing and the possibility of using non-standard data packaging. You can use standard Control Interface commands to access common data.

Not all service functions-requests are described here so to familiarise all presented or them detailing you must see to the function cntrCmdProc() of proper parts of OpenSCADA in the project sources.

14.4.1 Root Node and generic for all nodes

Getting the generic status of the station redundancy
REQ: <st path="/%2fserv%2fredundant" />
RESP: <st path="/%2fserv%2fredundant" rez="0" StLevel="{lev}" />

• lev — redundancy level of the station.

Scanning the configuration file
REQ[root-root]: <scan path="/%2fgen%2fconfig" />

Node-object requests

Getting for flag of the node modification

REQ: <modify path="/{nPath}/%2fobj" />

• nPath — path to need node.

RESP: <modify path="/{nPath}/%2fobj" rez="0">{flag}</modify>

• flag — the node modification status-flag, see to the enumeration TCntrNode::ModifFlag for the details.

<modify path="/Security/user/%2fobj" rez="0" user="roman">1</modify>

Loading the node

REQ: <load path="/{nPath}/%2fobj" force="{force}">{CfgCtx}</load>

• nPath — path to need node;
• force — the force loading sign [0|1], the node may be not marked as modified;
• CfgCtx — the configuration context in the tags "fld" for loading from that, used for remote copying the node configuration.

Saving the node

REQ: <save path="/{nPath}/%2fobj" force="{force}" ctx="{toCfgCtx}" />

• nPath — path to need node;
• force — the force saving sign [0|1], the node may be not marked as modified;
• toCfgCtx — sign [0|1] of saving the node configuration to the configuration context, used for remote copying the node configuration.

RESP: <save path="/{nPath}/%2fobj" force="{force}" ctx="{toCfgCtx}" rez="0">{CfgCtx}</save>

• CfgCtx — the configuration context in the tags "fld" after saving.

Local copying the specified node

REQ: <copy path="/{nPath}/%2fobj" src="{source}" dst="{destination}" />

• nPath — path to need node, can be any node in this operation;
• source — path to the source node;
• destination — path to the destination node.

Obtaining for child nodes of the specified node, optimised for the networks

REQ: <chlds path="/{nPath}/%2fobj" grp="{group}" icoCheck="{icoCheck}" />

• nPath — path to need node;
• group — the child nodes group-prefix;
• icoCheck — sign [0|1] of only checking the icon presence by setting the attribute "icoSize".

RESP: <chlds path="/{nPath}/%2fobj" grp="{group}" icoCheck="{icoCheck}" rez="0">{nodes}</chlds>

• nodes — nodes in the tags "el", where the name is in the tag text and the identifier in the attribute "id" for nodes with identifiers; the "el" tags contains additional tags and attributes:
  • ico — tag with data of the icon at not setting "icoCheck";
  • icoSize — size of the node icon at it presence and setting "icoCheck";
  • grp — tags of groups of the child nodes with the extra attributes:
    • chPresent — sign of the child nodes presence for the group.

<chlds grp="mod_" icoCheck="1" path="/Transport/%2fobj" rez="0" user="roman">
  <el icoSize="10348" id="Sockets">Sockets
    <grp acs="54" chPresent="1" dscr="Input transport" id="in_" idSz="20" idm="100" />
    <grp acs="54" chPresent="1" dscr="Output transport" id="out_" idSz="20" idm="100" />
  </el>
  <el icoSize="7148" id="Serial">Serial interfaces
    <grp acs="54" chPresent="1" dscr="Input transport" id="in_" idSz="20" idm="100" />
    <grp acs="54" chPresent="1" dscr="Output transport" id="out_" idSz="20" idm="100" />
  </el>
  <el icoSize="8944" id="SSL">SSL
    <grp acs="54" chPresent="1" dscr="Input transport" id="in_" idSz="20" idm="100" />
    <grp acs="54" chPresent="1" dscr="Output transport" id="out_" idSz="20" idm="100" />
  </el>
</chlds>

Generic lists

Obtaining the list of the DBs or tables

REQ: <get path="/{nPath}/%2fdb%2flist[:onlydb]" />

<get path="/{nPath}/%2fdb%2ftblList[:onlydb]" />

• nPath — path to need node, can be any node in this operation;
• "onlydb" — the address addition to point of listing only data bases without the group marks.

RESP: <get path="/{nPath}/%2fdb%2flist[:onlydb]" rez="0">{list}</get>

<get path="/{nPath}/%2fdb%2ftblList[:onlydb]" rez="0">{list}</get>

• list — elements in the tags "el".

<get path="/%2fdb%2flist:onlydb" rez="0" user="roman">
  <el>SQLite.vcaTest</el>
  <el>SQLite.vcaBase</el>
  <el>SQLite.vcaAGLKS</el>
  <el>MySQL.vcaTest</el>
  <el>MySQL.vcaBase</el>
  <el>PostgreSQL.testRelease</el>
  <el>PostgreSQL.test</el>
  <el>FireBird.testRelease</el>
  <el>FireBird.testFB</el>
  <el>FireBird.arch</el>
  <el>DBF.testRelease</el>
</get>

Obtaining the list of the supported internal programming languages

REQ: <get path="/{nPath}/%2fplang%2flist" />

• nPath — path to need node, can be any node in this operation.

RESP: <get path="/{nPath}/%2fplang%2flist" rez="0">{list}</get>

• list — elements in the tags "el".

<get path="/%2fplang%2flist" rez="0" user="roman">
  <el />
  <el>JavaLikeCalc.JavaScript</el>
</get>

14.4.2 The subsystem "Data Bases (DB)"

Sending the SQL request to the DB
REQ[root-BD]: <call path="/BD/{MOD}/{DB}/%2fserv%2fSQL" withRez="{withResult}" intoTrans="{intoTrans}">{request}</call>

• MOD, DB — the DB module and same DB;
• withResult — sign to return the SQL result [0|1];
• intoTrans — whether call the request in the transaction — TRUE(1), out — FALSE(0) or not matter by default — EVAL(2);
• request — text of the SQL request.

RESP: <call path="/BD/{MOD}/{DB}/%2fserv%2fSQL" withRez="{withResult}" intoTrans="{intoTrans}" rez="0">{result}</call>

• result — result table in the tags "el" packed in the "list" tags per column and with the column header in the first item.

<call path="/BD/SQLite/GenDB/%2fserv%2fSQL" rez="0" user="roman" withRez="1">
  <list>
    <el>user</el>
    <el>root</el>
    <el>root</el>
    <el>roman</el>
    <el>roman</el>
    <el>roman</el>
  </list>
  <list>
    <el>id</el>
    <el>/sub_Protocol/mod_HTTP/AuthTime</el>
    <el>/sub_Protocol/mod_HTTP/AutoLogin</el>
    <el>/sub_UI/mod_QTCfg/st</el>
    <el>/sub_UI/mod_VCAEngine/wdgAttr</el>
    <el>/sub_BD/mod_SQLite/ReqTm</el>
  </list>
  <list>
    <el>val</el>
    <el>10</el>
    <el>&lt;aLog&gt;&lt;it addrs="*" user="user" /&gt;&lt;/aLog&gt;</el>
    <el>1272:942:AAAA/wAAAAEAAAACAAABTwAABh8B/////wEAAAABAA==</el>
    <el>doc</el>
    <el>204us</el>
  </list>
</call>

Requesting the field structure of the specified DB table
REQ: <call path="/BD/{MOD}/{DB}/%2fserv%2ffieldStruct" tbl="{table}" />

• MOD, DB — the DB module and same DB;
• table — table of the operation.

RESP: <call path="/BD/{MOD}/{DB}/%2fserv%2ffieldStruct" tbl="{table}" rez="0">{structure}</call>

• structure — structure of the table in the tag "fld" with attributes of representing the cells in names "{ID}_str" and content "{TP}:{FLAG}:{LEN}:{DEF}:{FView}:{FKeyUse}:{FNoTransl}:{FReqKey}:{FExtVal}".

• TP — type of the cell, see to the object #TFld;
• FLAG — flags of the cell, see to the object #TCfg;
• LEN — whole length of the cell, see lenS() of the object #TFld;
• DEF — default value of the cell, see def() of the object #TFld;
• FView, FKeyUse, FNoTransl, FReqKey, FExtVal — dynamic flags of the object #TCfg: view(), keyUse(), noTransl(), reqKey(), extVal().

<call path="/BD/SQLite/GenDB/%2fserv%2ffieldStruct" rez="0" tbl="SYS" user="roman">
  <fld id_str="5:512:16777215.0::1:0:0:0:0" uk#val_str="5:0:16777215.0::1:0:0:0:0" user_str="5:512:16777215.0::1:0:0:0:0" val_str="5:0:16777215.0::1:0:0:0:0" />
</call>

Seeking the fields of the specified DB table
REQ: <call path="/BD/{MOD}/{DB}/%2fserv%2ffieldSeek" tbl="{table}" row="{row}" cacheKey="{cacheKey}">{field}</call>

• MOD, DB — the DB module and same DB;
• table — table of the operation;
• row — the seeking-scanning row;
• cacheKey — a unique string key of the client for creating the preloading data session at the first request and using the ready data in other ones;
• field — cells in the attributes of the requesting field tag "fld" with key values for narrowing the requesting data area. The field tag contains the structure attributes "{ID}_str" for the dynamic flags view(), keyUse() at least, see the structure request for the attribute structure.

RESP: <call path="/BD/{MOD}/{DB}/%2fserv%2ffieldSeek" tbl="{table}" row="{row}" cacheKey="{cacheKey}" rez="0" fRez="{fRez}">{field}</call>

• fRez — result of the function request with indication the data-row presence [0|1];
• field — cell values in the attributes of the requesting field tag "fld".

<call path="/BD/SQLite/GenDB/%2fserv%2ffieldSeek" tbl="SYS" row="5" cacheKey="0x7f17c8fcd5e0" user="roman" rez="0" fRez="1">
  <fld user="roman" user_str="5:512:16777215.0::1:0:0:0:0" 
       id="/sub_BD/mod_SQLite/ReqTm" id_str="5:512:16777215.0::1:0:0:0:0" 
       val="204us" val_str="5:0:16777215.0::1:0:0:0:0" uk#val_str="5:0:16777215.0::1:0:0:0:0" />
</call>

Getting the field of the specified DB table
REQ: <call path="/BD/{MOD}/{DB}/%2fserv%2ffieldGet" tbl="{table}">{field}</call>

• MOD, DB — the DB module and same DB;
• table — table of the operation;
• field — cells in the attributes of the requesting field tag "fld" with key values. The field tag contains the structure attributes "{ID}_str" for the dynamic flags view() at least, see the structure request for the attribute structure.

RESP: <call path="/BD/{MOD}/{DB}/%2fserv%2ffieldGet" tbl="{table}" rez="0">{field}</call>

• field — cell values in the attributes of the requesting field tag "fld".

<call path="/BD/SQLite/GenDB/%2fserv%2ffieldGet" rez="0" tbl="SYS" user="roman">
  <fld id="/sub_BD/mod_SQLite/ReqTm" id_str="5:512:16777215.0::1:0:0:0:0"
       user="roman" user_str="5:512:16777215.0::1:0:0:0:0"
       val="204us" val_str="5:0:16777215.0::1:0:0:0:0" uk#val_str="5:0:16777215.0::1:0:0:0:0" />
</call>

Setting the field of the specified DB table
REQ[root-BD]: <call path="/BD/{MOD}/{DB}/%2fserv%2ffieldSet" tbl="{table}">{field}</call>

• MOD, DB — the DB module and same DB;
• table — table of the operation;
• field — cells in the attributes of the requesting field tag "fld" with all setting values. The field tag contains the structure attributes "{ID}_str" and that structure will be apply at new cells creation or correction parameters of present ones, see the structure request for the attribute structure.

<call path="/BD/SQLite/GenDB//%2fserv%2ffieldSet" tbl="SYS">
  <fld user_ext="roman" user_str="5:512:16777215.0::0:1:0:0:1"
       id_ext="/sub_BD/mod_SQLite/ReqTm" id_str="5:512:16777215.0::0:1:0:0:1"
       val="205us" val_str="5:0:16777215.0::1:0:0:0:0" />
</call>

Deleting the field of the specified DB table
REQ[root-BD]: <call path="/BD/{MOD}/{DB}/%2fserv%2ffieldDel" tbl="{table}">{field}</call>

• MOD, DB — the DB module and same DB;
• table — table of the operation;
• field — key cell values in the attributes of the requesting field tag "fld". The field tag contains the structure attributes "{ID}_str" for keys, see the structure request for the attribute structure.

<call path="/BD/SQLite/GenDB//%2fserv%2ffieldDel" tbl="SYS">
  <fld user="roman" user_str="5:512:16777215.0::0:1:0:0:0"
       id="/sub_BD/mod_SQLite/ReqTm" id_str="5:512:16777215.0::0:1:0:0:0" />
</call>

14.4.3 The subsystem "Data Acquisition (DAQ)"

Getting the subsystem status of the station redundancy
REQ: <st path="/DAQ/%2fserv%2fredundant" />
RESP: <st path="/DAQ/%2fserv%2fredundant" rez="0" inProc="1" StLevel="{lev}">{status}</st>

• lev — redundancy level of the station;
• status — actual redundancy status of the DAQ controller objects in the "cntr" tags: <cntr id="{cntrId}" run="{runSt}" />
  • cntrId — the controller object whole identifier;
  • runSt — the controller object running status [0|1] on this station.

<st StLevel="10" inProc="1" path="/DAQ/%2fserv%2fredundant" rez="0" user="roman">
  <cntr id="BlockCalc.CM101" run="1" />
  <cntr id="BlockCalc.CM102" run="1" />
  <cntr id="BlockCalc.CM102cntr" run="1" />
  ...
  <cntr id="ModBus.testTCP" run="1" />
  <cntr id="OPC_UA.test" run="1" />
  <cntr id="System.AutoDA" run="1" />
</st>