Class CachingConnectionFactory

All Implemented Interfaces:
ConnectionFactory, ExceptionListener, QueueConnectionFactory, TopicConnectionFactory, DisposableBean, 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.

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.

As of Spring Framework 5, this class supports JMS 2.0 JMSContext calls and therefore requires the JMS 2.0 API to be present at runtime. It may nevertheless run against a JMS 1.1 driver (bound to the JMS 2.0 API) as long as no actual JMS 2.0 calls are triggered by the application's setup.

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.

Juergen Hoeller
  • Constructor Details

  • Method Details

    • 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:
    • 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.
    • getCachedSessionCount

      public int getCachedSessionCount()
      Return a current session count, indicating the number of sessions currently cached by this connection factory.
    • resetConnection

      public void resetConnection()
      Resets the Session cache as well.
      resetConnection in class SingleConnectionFactory
      See Also:
    • getSession

      protected Session getSession(Connection con, Integer mode) throws JMSException
      Checks for a cached Session for the given mode.
      getSession in class SingleConnectionFactory
      con - the JMS Connection to operate on
      mode - the Session acknowledgement mode (Session.TRANSACTED or one of the common modes)
      the Session to use, or null to indicate creation of a raw standard Session
      JMSException - if thrown by the JMS API
    • getCachedSessionProxy

      protected Session getCachedSessionProxy(Session target, Deque<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.
      target - the original Session to wrap
      sessionList - the List of cached Sessions that the given Session belongs to
      the wrapped Session