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

All Implemented Interfaces:
Aware, BeanClassLoaderAware, 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 task executor to have listeners executed in different threads, for example from a thread pool.
Author:
Rod Johnson, Juergen Hoeller, Stephane Nicoll
See Also:
setTaskExecutor(java.util.concurrent.Executor)

Constructor Summary

Constructors
Constructor	Description
`SimpleApplicationEventMulticaster()`	Create a new SimpleApplicationEventMulticaster.
`SimpleApplicationEventMulticaster(BeanFactory beanFactory)`	Create a new SimpleApplicationEventMulticaster for the given BeanFactory.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected ErrorHandler`	`getErrorHandler()`	Return the current error handler for this multicaster.
`protected Executor`	`getTaskExecutor()`	Return the current task executor for this multicaster.
`protected void`	`invokeListener(ApplicationListener<?> listener, ApplicationEvent event)`	Invoke the given listener with the given event.
`void`	`multicastEvent(ApplicationEvent event)`	Multicast the given application event to appropriate listeners.
`void`	`multicastEvent(ApplicationEvent event, ResolvableType eventType)`	Multicast the given application event to appropriate listeners.
`void`	`setErrorHandler(ErrorHandler errorHandler)`	Set the `ErrorHandler` to invoke in case an exception is thrown from a listener.
`void`	`setTaskExecutor(Executor taskExecutor)`	Set a custom executor (typically a `TaskExecutor`) to invoke each listener with.

Methods inherited from class org.springframework.context.event.AbstractApplicationEventMulticaster
addApplicationListener, addApplicationListenerBean, getApplicationListeners, getApplicationListeners, removeAllListeners, removeApplicationListener, removeApplicationListenerBean, setBeanClassLoader, setBeanFactory, supportsEvent, supportsEvent

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 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(Executor taskExecutor)
```
    Set a custom executor (typically a TaskExecutor) to invoke each listener with.
    Default is equivalent to SyncTaskExecutor, executing all listeners synchronously in the calling thread.
    Consider specifying an asynchronous task executor 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 Executor getTaskExecutor()
```
    Return the current task executor for this multicaster.
  - setErrorHandler
```
public void setErrorHandler(ErrorHandler errorHandler)
```
    Set the ErrorHandler to invoke in case an exception is thrown from a listener.
    Default is none, with a listener exception stopping the current multicast and getting propagated to the publisher of the current event. If a task executor is specified, each individual listener exception will get propagated to the executor but won't necessarily stop execution of other listeners.
    Consider setting an ErrorHandler implementation that catches and logs exceptions (a la TaskUtils.LOG_AND_SUPPRESS_ERROR_HANDLER) or an implementation that logs exceptions while nevertheless propagating them (e.g. TaskUtils.LOG_AND_PROPAGATE_ERROR_HANDLER).
    Since:
    4.1
  - getErrorHandler
```
protected ErrorHandler getErrorHandler()
```
    Return the current error handler for this multicaster.
    Since:
    4.1
  - multicastEvent
```
public void multicastEvent(ApplicationEvent event)
```
    Description copied from interface: ApplicationEventMulticaster
    Multicast the given application event to appropriate listeners.
    Consider using ApplicationEventMulticaster.multicastEvent(ApplicationEvent, ResolvableType) if possible as it provides a better support for generics-based events.
    Parameters:
    event - the event to multicast
  - multicastEvent
```
public void multicastEvent(ApplicationEvent event,
                           ResolvableType eventType)
```
    Description copied from interface: ApplicationEventMulticaster
    Multicast the given application event to appropriate listeners.
    If the eventType is null, a default type is built based on the event instance.
    Parameters:
    event - the event to multicast
    eventType - the type of event (can be null)
  - invokeListener
```
protected void invokeListener(ApplicationListener<?> listener,
                              ApplicationEvent event)
```
    Invoke the given listener with the given event.
    Parameters:
    listener - the ApplicationListener to invoke
    event - the current event to propagate
    Since:
    4.1

Class SimpleApplicationEventMulticaster

Constructor Summary

Method Summary

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

Methods inherited from class java.lang.Object

Constructor Detail

SimpleApplicationEventMulticaster

SimpleApplicationEventMulticaster

Method Detail

setTaskExecutor

getTaskExecutor

setErrorHandler

getErrorHandler

multicastEvent

multicastEvent

invokeListener