org.springframework.jms.connection

Class CachingConnectionFactory

java.lang.Object

org.springframework.jms.connection.SingleConnectionFactory

org.springframework.jms.connection.CachingConnectionFactory

All Implemented Interfaces:

ConnectionFactory, ExceptionListener, QueueConnectionFactory, TopicConnectionFactory, org.springframework.beans.factory.DisposableBean, org.springframework.beans.factory.InitializingBean

public class CachingConnectionFactory
extends SingleConnectionFactory

SingleConnectionFactory subclass that adds Session caching as well MessageProducer caching. This ConnectionFactory also switches the "reconnectOnException" property to "true" by default, allowing for automatic recovery of the underlying Connection.

By default, only one single Session will be cached, with further requested Sessions being created and disposed on demand. Consider raising the "sessionCacheSize" value in case of a high-concurrency environment.

NOTE: This ConnectionFactory decorator requires JMS 1.1 or higher. You may use it through the JMS 1.0.2 API; however, the target JMS driver needs to be compliant with JMS 1.1.

When using the JMS 1.0.2 API, this ConnectionFactory will switch into queue/topic mode according to the JMS API methods used at runtime: createQueueConnection and createTopicConnection will lead to queue/topic mode, respectively; generic createConnection calls will lead to a JMS 1.1 connection which is able to serve both modes.

NOTE: This ConnectionFactory requires explicit closing of all Sessions obtained from its shared Connection. This is the usual recommendation for native JMS access code anyway. However, with this ConnectionFactory, its use is mandatory in order to actually allow for Session reuse.

Note also that MessageConsumers obtained from a cached Session won't get closed until the Session will eventually be removed from the pool. This may lead to semantic side effects in some cases. For a durable subscriber, the logical Session.close() call will also close the subscription. Re-registering a durable consumer for the same subscription on the same Session handle is not supported; close and reobtain a cached Session first.

Since:

2.5.3

Author:

Juergen Hoeller

Field Summary

Fields inherited from class org.springframework.jms.connection.SingleConnectionFactory

logger

Constructor Summary

Constructors

Constructor and Description
CachingConnectionFactory() Create a new CachingConnectionFactory for bean-style usage.
CachingConnectionFactory(ConnectionFactory targetConnectionFactory) Create a new CachingConnectionFactory for the given target ConnectionFactory.

Method Summary

Methods

Modifier and Type	Method and Description
protected Session	getCachedSessionProxy(Session target, LinkedList<Session> sessionList) Wrap the given Session with a proxy that delegates every method call to it but adapts close calls.
protected Session	getSession(Connection con, Integer mode) Checks for a cached Session for the given mode.
int	getSessionCacheSize() Return the desired size for the JMS Session cache (per JMS Session type).
boolean	isCacheConsumers() Return whether to cache JMS MessageConsumers per JMS Session instance.
boolean	isCacheProducers() Return whether to cache JMS MessageProducers per JMS Session instance.
void	resetConnection() Resets the Session cache as well.
void	setCacheConsumers(boolean cacheConsumers) Specify whether to cache JMS MessageConsumers per JMS Session instance (more specifically: one MessageConsumer per Destination, selector String and Session).
void	setCacheProducers(boolean cacheProducers) Specify whether to cache JMS MessageProducers per JMS Session instance (more specifically: one MessageProducer per Destination and Session).
void	setSessionCacheSize(int sessionCacheSize) Specify the desired size for the JMS Session cache (per JMS Session type).

Methods inherited from class org.springframework.jms.connection.SingleConnectionFactory

afterPropertiesSet, closeConnection, createConnection, createConnection, createQueueConnection, createQueueConnection, createSession, createTopicConnection, createTopicConnection, destroy, doCreateConnection, getClientId, getExceptionListener, getSharedConnectionProxy, getTargetConnectionFactory, initConnection, isReconnectOnException, onException, prepareConnection, setClientId, setExceptionListener, setReconnectOnException, setTargetConnectionFactory

Methods inherited from class java.lang.Object

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

Constructor Detail

CachingConnectionFactory

public CachingConnectionFactory()

Create a new CachingConnectionFactory for bean-style usage.

See Also:

SingleConnectionFactory.setTargetConnectionFactory(javax.jms.ConnectionFactory)

CachingConnectionFactory

public CachingConnectionFactory(ConnectionFactory targetConnectionFactory)

Create a new CachingConnectionFactory for the given target ConnectionFactory.

Parameters:

targetConnectionFactory - the target ConnectionFactory

Method Detail

setSessionCacheSize

public void setSessionCacheSize(int sessionCacheSize)

Specify the desired size for the JMS Session cache (per JMS Session type).

This cache size is the maximum limit for the number of cached Sessions per session acknowledgement type (auto, client, dups_ok, transacted). As a consequence, the actual number of cached Sessions may be up to four times as high as the specified value - in the unlikely case of mixing and matching different acknowledgement types.

Default is 1: caching a single Session, (re-)creating further ones on demand. Specify a number like 10 if you'd like to raise the number of cached Sessions; that said, 1 may be sufficient for low-concurrency scenarios.

See Also:

setCacheProducers(boolean)

getSessionCacheSize

public int getSessionCacheSize()

Return the desired size for the JMS Session cache (per JMS Session type).

setCacheProducers

public void setCacheProducers(boolean cacheProducers)

Specify whether to cache JMS MessageProducers per JMS Session instance (more specifically: one MessageProducer per Destination and Session).

Default is "true". Switch this to "false" in order to always recreate MessageProducers on demand.

isCacheProducers

public boolean isCacheProducers()

Return whether to cache JMS MessageProducers per JMS Session instance.

setCacheConsumers

public void setCacheConsumers(boolean cacheConsumers)

Specify whether to cache JMS MessageConsumers per JMS Session instance (more specifically: one MessageConsumer per Destination, selector String and Session). Note that durable subscribers will only be cached until logical closing of the Session handle.

Default is "true". Switch this to "false" in order to always recreate MessageConsumers on demand.

isCacheConsumers

public boolean isCacheConsumers()

Return whether to cache JMS MessageConsumers per JMS Session instance.

resetConnection

public void resetConnection()

Resets the Session cache as well.

Overrides:

resetConnection in class SingleConnectionFactory

getSession

protected Session getSession(Connection con,
                 Integer mode)
                      throws JMSException

Checks for a cached Session for the given mode.

Overrides:

getSession in class SingleConnectionFactory

Parameters:

con - the JMS Connection to operate on

mode - the Session acknowledgement mode (Session.TRANSACTED or one of the common modes)

Returns:

the Session to use, or null to indicate creation of a raw standard Session

Throws:

JMSException - if thrown by the JMS API

getCachedSessionProxy

protected Session getCachedSessionProxy(Session target,
                            LinkedList<Session> sessionList)

Wrap the given Session with a proxy that delegates every method call to it but adapts close calls. This is useful for allowing application code to handle a special framework Session just like an ordinary Session.

Parameters:

target - the original Session to wrap

sessionList - the List of cached Sessions that the given Session belongs to

Returns:

the wrapped Session