org.springframework.jms.listener
Class SimpleMessageListenerContainer

java.lang.Object
  org.springframework.jms.support.JmsAccessor
      org.springframework.jms.support.destination.JmsDestinationAccessor
          org.springframework.jms.listener.AbstractJmsListeningContainer
              org.springframework.jms.listener.AbstractMessageListenerContainer
                  org.springframework.jms.listener.SimpleMessageListenerContainer

All Implemented Interfaces:

BeanNameAware, DisposableBean, InitializingBean, Lifecycle

Direct Known Subclasses:

SimpleMessageListenerContainer102

public class SimpleMessageListenerContainer
extends AbstractMessageListenerContainer

Message listener container that uses the plain JMS client API's MessageConsumer.setMessageListener() method to create concurrent MessageConsumers for the specified listeners.

NOTE: This class requires a JMS 1.1+ provider, because it builds on the domain-independent API. Use the SimpleMessageListenerContainer102 subclass for a JMS 1.0.2 provider, e.g. when running on a J2EE 1.3 server.

This is the simplest form of a message listener container. It creates a fixed number of JMS Sessions to invoke the listener, not allowing for dynamic adaptation to runtime demands. Its main advantage is its low level of complexity and the minimum requirements on the JMS provider: Not even the ServerSessionPool facility is required.

See the AbstractMessageListenerContainer javadoc for details on acknowledge modes and transaction options.

For a different style of MessageListener handling, through looped MessageConsumer.receive() calls that also allow for transactional reception of messages (registering them with XA transactions), see DefaultMessageListenerContainer. For dynamic adaptation of the active number of Sessions, consider using ServerSessionMessageListenerContainer.

Since:

2.0

Author:

Juergen Hoeller

See Also:

MessageConsumer.setMessageListener(javax.jms.MessageListener), DefaultMessageListenerContainer, ServerSessionMessageListenerContainer

Nested Class Summary

Nested classes/interfaces inherited from class org.springframework.jms.listener.AbstractJmsListeningContainer

AbstractJmsListeningContainer.SharedConnectionNotInitializedException

Field Summary

Fields inherited from class org.springframework.jms.listener.AbstractJmsListeningContainer

lifecycleMonitor, sharedConnectionMonitor

Fields inherited from class org.springframework.jms.support.JmsAccessor

logger

Constructor Summary

SimpleMessageListenerContainer()

Method Summary

protected MessageConsumer	createConsumer(Session session, Destination destination) Create a JMS MessageConsumer for the given Session and Destination.
protected MessageConsumer	createListenerConsumer(Session session) Create a MessageConsumer for the given JMS Session, registering a MessageListener for the specified listener.
protected void	doInitialize() Creates the specified number of concurrent consumers, in the form of a JMS Session plus associated MessageConsumer.
protected void	doShutdown() Destroy the registered JMS Sessions and associated MessageConsumers.
protected boolean	isPubSubNoLocal() Return whether to inhibit the delivery of messages published by its own connection.
void	setConcurrentConsumers(int concurrentConsumers) Specify the number of concurrent consumers to create.
void	setPubSubNoLocal(boolean pubSubNoLocal) Set whether to inhibit the delivery of messages published by its own connection.
void	setTaskExecutor(TaskExecutor taskExecutor) Set the Spring TaskExecutor to use for executing the listener once a message has been received by the provider.
protected boolean	sharedConnectionEnabled() Always use a shared JMS Connection.
protected void	validateConfiguration() Validate the configuration of this container.

Methods inherited from class org.springframework.jms.listener.AbstractMessageListenerContainer

checkMessageListener, commitIfNecessary, doExecuteListener, doInvokeListener, doInvokeListener, executeListener, getDestination, getDestinationName, getDurableSubscriptionName, getExceptionListener, getMessageListener, getMessageSelector, handleListenerException, invokeExceptionListener, invokeListener, isAcceptMessagesWhileStopping, isExposeListenerSession, isSessionLocallyTransacted, isSubscriptionDurable, rollbackIfNecessary, rollbackOnExceptionIfNecessary, setAcceptMessagesWhileStopping, setDestination, setDestinationName, setDurableSubscriptionName, setExceptionListener, setExposeListenerSession, setMessageListener, setMessageSelector, setSubscriptionDurable

Methods inherited from class org.springframework.jms.listener.AbstractJmsListeningContainer

afterPropertiesSet, createSharedConnection, destroy, doRescheduleTask, doStart, doStop, establishSharedConnection, getBeanName, getClientId, getSharedConnection, initialize, isActive, isRunning, prepareSharedConnection, refreshSharedConnection, rescheduleTaskIfNecessary, setAutoStartup, setBeanName, setClientId, shutdown, start, startSharedConnection, stop, stopSharedConnection, waitWhileNotRunning

Methods inherited from class org.springframework.jms.support.destination.JmsDestinationAccessor

getDestinationResolver, isPubSubDomain, resolveDestinationName, setDestinationResolver, setPubSubDomain

Methods inherited from class org.springframework.jms.support.JmsAccessor

convertJmsAccessException, createConnection, createSession, getConnectionFactory, getSessionAcknowledgeMode, isClientAcknowledge, isSessionTransacted, setConnectionFactory, setSessionAcknowledgeMode, setSessionAcknowledgeModeName, setSessionTransacted

Methods inherited from class java.lang.Object

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

Constructor Detail

SimpleMessageListenerContainer

public SimpleMessageListenerContainer()

Method Detail

setPubSubNoLocal

public void setPubSubNoLocal(boolean pubSubNoLocal)

Set whether to inhibit the delivery of messages published by its own connection. Default is "false".

See Also:

TopicSession.createSubscriber(javax.jms.Topic, String, boolean)

isPubSubNoLocal

protected boolean isPubSubNoLocal()

Return whether to inhibit the delivery of messages published by its own connection.

setConcurrentConsumers

public void setConcurrentConsumers(int concurrentConsumers)

Specify the number of concurrent consumers to create. Default is 1.

Raising the number of concurrent consumers is recommendable in order to scale the consumption of messages coming in from a queue. However, note that any ordering guarantees are lost once multiple consumers are registered. In general, stick with 1 consumer for low-volume queues.

Do not raise the number of concurrent consumers for a topic. This would lead to concurrent consumption of the same message, which is hardly ever desirable.

setTaskExecutor

public void setTaskExecutor(TaskExecutor taskExecutor)

Set the Spring TaskExecutor to use for executing the listener once a message has been received by the provider.

Default is none, that is, to run in the JMS provider's own receive thread, blocking the provider's receive endpoint while executing the listener.

Specify a TaskExecutor for executing the listener in a different thread, rather than blocking the JMS provider, usually integrating with an existing thread pool. This allows to keep the number of concurrent consumers low (1) while still processing messages concurrently (decoupled from receiving!).

NOTE: Specifying a TaskExecutor for listener execution affects acknowledgement semantics. Messages will then always get acknowledged before listener execution, with the underlying Session immediately reused for receiving the next message. Using this in combination with a transacted session or with client acknowledgement will lead to unspecified results!

NOTE: Concurrent listener execution via a TaskExecutor will lead to concurrent processing of messages that have been received by the same underlying Session. As a consequence, it is not recommended to use this setting with a SessionAwareMessageListener, at least not if the latter performs actual work on the given Session. A standard MessageListener will work fine, in general.

See Also:

setConcurrentConsumers(int), SimpleAsyncTaskExecutor, WorkManagerTaskExecutor

validateConfiguration

protected void validateConfiguration()

Description copied from class: AbstractJmsListeningContainer

Validate the configuration of this container.

The default implementation is empty. To be overridden in subclasses.

Overrides:

validateConfiguration in class AbstractMessageListenerContainer

sharedConnectionEnabled

protected final boolean sharedConnectionEnabled()

Always use a shared JMS Connection.

Specified by:

sharedConnectionEnabled in class AbstractJmsListeningContainer

See Also:

AbstractJmsListeningContainer.getSharedConnection()

doInitialize

protected void doInitialize()
                     throws JMSException

Creates the specified number of concurrent consumers, in the form of a JMS Session plus associated MessageConsumer.

Specified by:

doInitialize in class AbstractJmsListeningContainer

Throws:

JMSException - if registration failed

See Also:

createListenerConsumer(javax.jms.Session)

createListenerConsumer

protected MessageConsumer createListenerConsumer(Session session)
                                          throws JMSException

Create a MessageConsumer for the given JMS Session, registering a MessageListener for the specified listener.

Parameters:

session - the JMS Session to work on

Returns:

the MessageConsumer

Throws:

JMSException - if thrown by JMS methods

See Also:

AbstractMessageListenerContainer.executeListener(javax.jms.Session, javax.jms.Message)

doShutdown

protected void doShutdown()
                   throws JMSException

Destroy the registered JMS Sessions and associated MessageConsumers.

Specified by:

doShutdown in class AbstractJmsListeningContainer

Throws:

JMSException - if shutdown failed

See Also:

AbstractJmsListeningContainer.shutdown()

createConsumer

protected MessageConsumer createConsumer(Session session,
                                         Destination destination)
                                  throws JMSException

Create a JMS MessageConsumer for the given Session and Destination.

This implementation uses JMS 1.1 API.

Parameters:

session - the JMS Session to create a MessageConsumer for

destination - the JMS Destination to create a MessageConsumer for

Returns:

the new JMS MessageConsumer

Throws:

JMSException - if thrown by JMS API methods