org.springframework.context.event
Class SimpleApplicationEventMulticaster

java.lang.Object
  org.springframework.context.event.AbstractApplicationEventMulticaster
      org.springframework.context.event.SimpleApplicationEventMulticaster

All Implemented Interfaces:

BeanFactoryAware, ApplicationEventMulticaster

public class SimpleApplicationEventMulticaster
extends AbstractApplicationEventMulticaster

Simple implementation of the ApplicationEventMulticaster interface.

Multicasts all events to all registered listeners, leaving it up to the listeners to ignore events that they are not interested in. Listeners will usually perform corresponding instanceof checks on the passed-in event object.

By default, all listeners are invoked in the calling thread. This allows the danger of a rogue listener blocking the entire application, but adds minimal overhead. Specify an alternative TaskExecutor to have listeners executed in different threads, for example from a thread pool.

Author:

Rod Johnson, Juergen Hoeller

See Also:

setTaskExecutor(java.util.concurrent.Executor)

Field Summary

private java.util.concurrent.Executor

taskExecutor

Constructor Summary

SimpleApplicationEventMulticaster()
Create a new SimpleApplicationEventMulticaster.

SimpleApplicationEventMulticaster(BeanFactory beanFactory)
Create a new SimpleApplicationEventMulticaster for the given BeanFactory.

Method Summary

protected java.util.concurrent.Executor	getTaskExecutor() Return the current TaskExecutor for this multicaster.
void	multicastEvent(ApplicationEvent event) Multicast the given application event to appropriate listeners.
void	setTaskExecutor(java.util.concurrent.Executor taskExecutor) Set the TaskExecutor to execute application listeners with.

Methods inherited from class org.springframework.context.event.AbstractApplicationEventMulticaster

addApplicationListener, addApplicationListenerBean, getApplicationListeners, getApplicationListeners, removeAllListeners, removeApplicationListener, removeApplicationListenerBean, setBeanFactory, supportsEvent

Methods inherited from class java.lang.Object

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

Field Detail

taskExecutor

private java.util.concurrent.Executor taskExecutor

Constructor Detail

SimpleApplicationEventMulticaster

public SimpleApplicationEventMulticaster()

Create a new SimpleApplicationEventMulticaster.

SimpleApplicationEventMulticaster

public SimpleApplicationEventMulticaster(BeanFactory beanFactory)

Create a new SimpleApplicationEventMulticaster for the given BeanFactory.

Method Detail

setTaskExecutor

public void setTaskExecutor(java.util.concurrent.Executor taskExecutor)

Set the TaskExecutor to execute application listeners with.

Default is a SyncTaskExecutor, executing the listeners synchronously in the calling thread.

Consider specifying an asynchronous TaskExecutor here to not block the caller until all listeners have been executed. However, note that asynchronous execution will not participate in the caller's thread context (class loader, transaction association) unless the TaskExecutor explicitly supports this.

See Also:

SyncTaskExecutor, SimpleAsyncTaskExecutor

getTaskExecutor

protected java.util.concurrent.Executor getTaskExecutor()

Return the current TaskExecutor for this multicaster.

multicastEvent

public void multicastEvent(ApplicationEvent event)

Description copied from interface: ApplicationEventMulticaster

Multicast the given application event to appropriate listeners.

Parameters:

event - the event to multicast