org.apache.activemq.store.memory
Class MemoryPersistenceAdapter

java.lang.Object
  extended by org.apache.activemq.store.memory.MemoryPersistenceAdapter
All Implemented Interfaces:
Service, PersistenceAdapter

public class MemoryPersistenceAdapter
extends Object
implements PersistenceAdapter


Constructor Summary
MemoryPersistenceAdapter()
           
 
Method Summary
protected  MemoryMessageStore asMemoryMessageStore(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 checkpoint(boolean sync)
          checkpoint any
 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.
 Set<ActiveMQDestination> getDestinations()
          Returns a set of all the ActiveMQDestination objects that the persistence store is aware exist.
 File getDirectory()
           
 long getLastMessageBrokerSequenceId()
           
 long getLastProducerSequenceId(ProducerId id)
          return the last stored producer sequenceId for this producer Id used to suppress duplicate sends on failover reconnect at the transport when a reconnect occurs
 boolean isUseExternalMessageReferences()
           
static MemoryPersistenceAdapter newInstance(File file)
           
 void removeQueueMessageStore(ActiveMQQueue destination)
          Cleanup method to remove any state associated with the given destination
 void removeTopicMessageStore(ActiveMQTopic destination)
          Cleanup method to remove any state associated with the given destination
 void rollbackTransaction(ConnectionContext context)
          Rollback a persistence transaction
 void setBrokerName(String brokerName)
          Set the name of the broker using the adapter
 void setCreateTransactionStore(boolean create)
           
 void setDirectory(File dir)
          Set the directory where any data files should be created
 void setUsageManager(SystemUsage usageManager)
           
 void setUseExternalMessageReferences(boolean useExternalMessageReferences)
           
 long size()
          A hint to return the size of the store on disk
 void start()
           
 void stop()
           
 String toString()
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

MemoryPersistenceAdapter

public MemoryPersistenceAdapter()
Method Detail

getDestinations

public Set<ActiveMQDestination> 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:
active destinations

newInstance

public static MemoryPersistenceAdapter newInstance(File file)

createQueueMessageStore

public MessageStore createQueueMessageStore(ActiveMQQueue destination)
                                     throws 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
Returns:
the message store
Throws:
IOException

createTopicMessageStore

public TopicMessageStore createTopicMessageStore(ActiveMQTopic destination)
                                          throws 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
Returns:
the topic message store
Throws:
IOException

removeQueueMessageStore

public void removeQueueMessageStore(ActiveMQQueue destination)
Cleanup method to remove any state associated with the given destination

Specified by:
removeQueueMessageStore in interface PersistenceAdapter
Parameters:
destination - Destination to forget

removeTopicMessageStore

public void removeTopicMessageStore(ActiveMQTopic destination)
Cleanup method to remove any state associated with the given destination

Specified by:
removeTopicMessageStore in interface PersistenceAdapter
Parameters:
destination - Destination to forget

createTransactionStore

public TransactionStore createTransactionStore()
                                        throws 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
Returns:
transaction store
Throws:
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(ConnectionContext context)

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(ConnectionContext context)

start

public void start()
           throws Exception
Specified by:
start in interface Service
Throws:
Exception

stop

public void stop()
          throws Exception
Specified by:
stop in interface Service
Throws:
Exception

getLastMessageBrokerSequenceId

public long getLastMessageBrokerSequenceId()
                                    throws IOException
Specified by:
getLastMessageBrokerSequenceId in interface PersistenceAdapter
Returns:
last broker sequence
Throws:
IOException

deleteAllMessages

public void deleteAllMessages()
                       throws IOException
Description copied from interface: PersistenceAdapter
Delete's all the messages in the persistent store.

Specified by:
deleteAllMessages in interface PersistenceAdapter
Throws:
IOException

isUseExternalMessageReferences

public boolean isUseExternalMessageReferences()

setUseExternalMessageReferences

public void setUseExternalMessageReferences(boolean useExternalMessageReferences)

asMemoryMessageStore

protected MemoryMessageStore asMemoryMessageStore(Object value)

setUsageManager

public void setUsageManager(SystemUsage usageManager)
Specified by:
setUsageManager in interface PersistenceAdapter
Parameters:
usageManager - The UsageManager that is controlling the broker's memory usage.

toString

public String toString()
Overrides:
toString in class Object

setBrokerName

public void setBrokerName(String brokerName)
Description copied from interface: PersistenceAdapter
Set the name of the broker using the adapter

Specified by:
setBrokerName in interface PersistenceAdapter

setDirectory

public void setDirectory(File dir)
Description copied from interface: PersistenceAdapter
Set the directory where any data files should be created

Specified by:
setDirectory in interface PersistenceAdapter

getDirectory

public File getDirectory()
Specified by:
getDirectory in interface PersistenceAdapter
Returns:
the directory used by the persistence adaptor

checkpoint

public void checkpoint(boolean sync)
                throws IOException
Description copied from interface: PersistenceAdapter
checkpoint any

Specified by:
checkpoint in interface PersistenceAdapter
Throws:
IOException

size

public long size()
Description copied from interface: PersistenceAdapter
A hint to return the size of the store on disk

Specified by:
size in interface PersistenceAdapter
Returns:
disk space used in bytes of 0 if not implemented

setCreateTransactionStore

public void setCreateTransactionStore(boolean create)
                               throws IOException
Throws:
IOException

getLastProducerSequenceId

public long getLastProducerSequenceId(ProducerId id)
Description copied from interface: PersistenceAdapter
return the last stored producer sequenceId for this producer Id used to suppress duplicate sends on failover reconnect at the transport when a reconnect occurs

Specified by:
getLastProducerSequenceId in interface PersistenceAdapter
Parameters:
id - the producerId to find a sequenceId for
Returns:
the last stored sequence id or -1 if no suppression needed


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