org.apache.activemq.store.memory
Class MemoryPersistenceAdapter

java.lang.Object
  org.apache.activemq.store.memory.MemoryPersistenceAdapter

All Implemented Interfaces:

Service, PersistenceAdapter

public class MemoryPersistenceAdapter
extends java.lang.Object
implements PersistenceAdapter

Version:

$Revision: 1.4 $

Constructor Summary

MemoryPersistenceAdapter()

Method Summary

protected MemoryMessageStore	asMemoryMessageStore(java.lang.Object value)
void	beginTransaction(ConnectionContext context) This method starts a transaction on the persistent storage - which is nothing to do with JMS or XA transactions - its purely a mechanism to perform multiple writes to a persistent store in 1 transaction as a performance optimization.
void	commitTransaction(ConnectionContext context) Commit a persistence transaction
MessageStore	createQueueMessageStore(ActiveMQQueue destination) Factory method to create a new queue message store with the given destination name
TopicMessageStore	createTopicMessageStore(ActiveMQTopic destination) Factory method to create a new topic message store with the given destination name
TransactionStore	createTransactionStore() Factory method to create a new persistent prepared transaction store for XA recovery
void	deleteAllMessages() Delete's all the messages in the persistent store.
java.util.Set	getDestinations() Returns a set of all the ActiveMQDestination objects that the persistence store is aware exist.
long	getLastMessageBrokerSequenceId()
boolean	isUseExternalMessageReferences()
static MemoryPersistenceAdapter	newInstance(java.io.File file)
void	rollbackTransaction(ConnectionContext context) Rollback a persistence transaction
void	setUsageManager(UsageManager usageManager)
void	setUseExternalMessageReferences(boolean useExternalMessageReferences)
void	start()
void	stop()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MemoryPersistenceAdapter

public MemoryPersistenceAdapter()

Method Detail

getDestinations

public java.util.Set getDestinations()

Description copied from interface: PersistenceAdapter

Returns a set of all the ActiveMQDestination objects that the persistence store is aware exist.

Specified by:

getDestinations in interface PersistenceAdapter

Returns:

newInstance

public static MemoryPersistenceAdapter newInstance(java.io.File file)

createQueueMessageStore

public MessageStore createQueueMessageStore(ActiveMQQueue destination)
                                     throws java.io.IOException

Description copied from interface: PersistenceAdapter

Factory method to create a new queue message store with the given destination name

Specified by:

createQueueMessageStore in interface PersistenceAdapter

Throws:

java.io.IOException

createTopicMessageStore

public TopicMessageStore createTopicMessageStore(ActiveMQTopic destination)
                                          throws java.io.IOException

Description copied from interface: PersistenceAdapter

Factory method to create a new topic message store with the given destination name

Specified by:

createTopicMessageStore in interface PersistenceAdapter

Throws:

java.io.IOException

createTransactionStore

public TransactionStore createTransactionStore()
                                        throws java.io.IOException

Description copied from interface: PersistenceAdapter

Factory method to create a new persistent prepared transaction store for XA recovery

Specified by:

createTransactionStore in interface PersistenceAdapter

Throws:

java.io.IOException

beginTransaction

public void beginTransaction(ConnectionContext context)

Description copied from interface: PersistenceAdapter

This method starts a transaction on the persistent storage - which is nothing to do with JMS or XA transactions - its purely a mechanism to perform multiple writes to a persistent store in 1 transaction as a performance optimization.

Typically one transaction will require one disk synchronization point and so for real high performance its usually faster to perform many writes within the same transaction to minimize latency caused by disk synchronization. This is especially true when using tools like Berkeley Db or embedded JDBC servers.

Specified by:

beginTransaction in interface PersistenceAdapter

commitTransaction

public void commitTransaction(ConnectionContext context)

Description copied from interface: PersistenceAdapter

Commit a persistence transaction

Specified by:

commitTransaction in interface PersistenceAdapter

See Also:

PersistenceAdapter#beginTransaction()

rollbackTransaction

public void rollbackTransaction(ConnectionContext context)

Description copied from interface: PersistenceAdapter

Rollback a persistence transaction

Specified by:

rollbackTransaction in interface PersistenceAdapter

See Also:

PersistenceAdapter#beginTransaction()

start

public void start()
           throws java.lang.Exception

Specified by:

start in interface Service

Throws:

java.lang.Exception

stop

public void stop()
          throws java.lang.Exception

Specified by:

stop in interface Service

Throws:

java.lang.Exception

getLastMessageBrokerSequenceId

public long getLastMessageBrokerSequenceId()
                                    throws java.io.IOException

Specified by:

getLastMessageBrokerSequenceId in interface PersistenceAdapter

Returns:

Throws:

java.io.IOException

deleteAllMessages

public void deleteAllMessages()
                       throws java.io.IOException

Description copied from interface: PersistenceAdapter

Delete's all the messages in the persistent store.

Specified by:

deleteAllMessages in interface PersistenceAdapter

Throws:

java.io.IOException

isUseExternalMessageReferences

public boolean isUseExternalMessageReferences()

Specified by:

isUseExternalMessageReferences in interface PersistenceAdapter

setUseExternalMessageReferences

public void setUseExternalMessageReferences(boolean useExternalMessageReferences)

Specified by:

setUseExternalMessageReferences in interface PersistenceAdapter

asMemoryMessageStore

protected MemoryMessageStore asMemoryMessageStore(java.lang.Object value)

setUsageManager

public void setUsageManager(UsageManager usageManager)

Specified by:

setUsageManager in interface PersistenceAdapter

Parameters:

usageManager - The UsageManager that is controlling the broker's memory usage.