org.jboss.webbeans.event
Class EventManager

java.lang.Object
  org.jboss.webbeans.event.EventManager

public class EventManager
extends java.lang.Object

The event bus is where observers are registered and events are fired.

Author:

David Allen

Constructor Summary

EventManager()
Initializes a new instance of the EventManager.

Method Summary

<T> void	addObserver(Observer<T> observer, java.lang.Class<T> eventType, java.lang.annotation.Annotation... bindings) Adds an observer to the event bus so that it receives event notifications.
<T> java.util.Set<Observer<T>>	getObservers(T event, java.lang.annotation.Annotation... bindings) Resolves the list of observers to be notified for a given event and optional event bindings.
<T> void	notifyObservers(java.util.Set<Observer<T>> observers, T event) Iterates over the interested observers.
<T> void	removeObserver(Observer<T> observer, java.lang.Class<T> eventType, java.lang.annotation.Annotation... bindings) Removes an observer from the event bus.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

EventManager

public EventManager()

Initializes a new instance of the EventManager.

Method Detail

addObserver

public <T> void addObserver(Observer<T> observer,
                            java.lang.Class<T> eventType,
                            java.lang.annotation.Annotation... bindings)

Adds an observer to the event bus so that it receives event notifications.

Parameters:

observer - The observer that should receive events

eventType - The event type the observer is interested in

bindings - The bindings the observer wants to filter on

getObservers

public <T> java.util.Set<Observer<T>> getObservers(T event,
                                                   java.lang.annotation.Annotation... bindings)

Resolves the list of observers to be notified for a given event and optional event bindings.

Parameters:

event - The event object

bindings - Optional event bindings

Returns:

A set of Observers. An empty set is returned if there are no matches.

notifyObservers

public <T> void notifyObservers(java.util.Set<Observer<T>> observers,
                                T event)

Iterates over the interested observers. If an observer is transactional and there is a transaction currently in progress, the event is deferred. In other cases, the observer is notified immediately.

Parameters:

observers - The interested observers

event - The event type

removeObserver

public <T> void removeObserver(Observer<T> observer,
                               java.lang.Class<T> eventType,
                               java.lang.annotation.Annotation... bindings)

Removes an observer from the event bus.

Parameters:

observer - The observer to remove

eventType - The event type of the observer to remove

bindings - The bindings of the observer to remove

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object