org.axonframework.eventhandling

Class SimpleEventHandlerInvoker

java.lang.Object

org.axonframework.eventhandling.SimpleEventHandlerInvoker

All Implemented Interfaces:

EventHandlerInvoker, MessageHandler<EventMessage<?>>

public class SimpleEventHandlerInvoker
extends Object
implements EventHandlerInvoker

Implementation of an EventHandlerInvoker that forwards events to a list of registered EventListeners.

Author:

Rene de Waele

Constructor Summary

Constructors

Constructor and Description
SimpleEventHandlerInvoker(List<?> eventListeners, ListenerInvocationErrorHandler listenerInvocationErrorHandler) Initializes a SimpleEventHandlerInvoker containing the given list of eventListeners.
SimpleEventHandlerInvoker(List<?> eventListeners, ParameterResolverFactory parameterResolverFactory, ListenerInvocationErrorHandler listenerInvocationErrorHandler) Initializes a SimpleEventHandlerInvoker containing the given list of eventListeners.
SimpleEventHandlerInvoker(Object... eventListeners) Initializes a SimpleEventHandlerInvoker containing one or more eventListeners.

Method Summary

Modifier and Type	Method and Description
Object	handle(EventMessage<?> message) Handles the given message.
boolean	hasHandler(EventMessage<?> eventMessage) Check whether or not this invoker has handlers that can handle the given eventMessage.

Methods inherited from class java.lang.Object

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

Constructor Detail

SimpleEventHandlerInvoker

public SimpleEventHandlerInvoker(Object... eventListeners)

Initializes a SimpleEventHandlerInvoker containing one or more eventListeners. If an event listener is assignable to EventListener it will registered as is. If not, it will be wrapped by a new AnnotationEventListenerAdapter.

Events handled by the invoker will be passed to all the given eventListeners. If an exception is triggered during event handling it will be logged using a LoggingErrorHandler but otherwise ignored.

Parameters:

eventListeners - one or more event listeners to register with this invoker

SimpleEventHandlerInvoker

public SimpleEventHandlerInvoker(List<?> eventListeners,
                                 ListenerInvocationErrorHandler listenerInvocationErrorHandler)

Initializes a SimpleEventHandlerInvoker containing the given list of eventListeners. If an event listener is assignable to EventListener it will registered as is. If not, it will be wrapped by a new AnnotationEventListenerAdapter.

Events handled by the invoker will be passed to all the given eventListeners. If an exception is triggered during event handling it will be handled by the given listenerErrorHandler.

Parameters:

eventListeners - list of event listeners to register with this invoker

listenerInvocationErrorHandler - error handler that handles exceptions during processing

SimpleEventHandlerInvoker

public SimpleEventHandlerInvoker(List<?> eventListeners,
                                 ParameterResolverFactory parameterResolverFactory,
                                 ListenerInvocationErrorHandler listenerInvocationErrorHandler)

Initializes a SimpleEventHandlerInvoker containing the given list of eventListeners. If an event listener is assignable to EventListener it will registered as is. If not, it will be wrapped by a new AnnotationEventListenerAdapter.

Events handled by the invoker will be passed to all the given eventListeners. If an exception is triggered during event handling it will be handled by the given listenerErrorHandler.

Parameters:

eventListeners - list of event listeners to register with this invoker

parameterResolverFactory - The parameter resolver factory to resolve parameters of the Event Handler methods with

listenerInvocationErrorHandler - error handler that handles exceptions during processing

Method Detail

handle

public Object handle(EventMessage<?> message)
              throws Exception

Description copied from interface: MessageHandler

Handles the given message.

Specified by:

handle in interface MessageHandler<EventMessage<?>>

Parameters:

message - The message to be processed.

Returns:

The result of the message processing.

Throws:

Exception - any exception that occurs during message handling

hasHandler

public boolean hasHandler(EventMessage<?> eventMessage)

Description copied from interface: EventHandlerInvoker

Check whether or not this invoker has handlers that can handle the given eventMessage.

Specified by:

hasHandler in interface EventHandlerInvoker

Parameters:

eventMessage - The message to be processed

Returns:

true if the invoker has one or more handlers that can handle the given message, false otherwise