Examples of org.eclipse.osgi.framework.eventmgr.ListenerQueue

org.eclipse.osgi.framework.eventmgr.ListenerQueue

The ListenerQueue is used to snapshot the list of listeners at the time the event is fired. The snapshot list is then used to dispatch events to those listeners. A ListenerQueue object is associated with a specific EventManager object. ListenerQueue objects constructed with the same EventManager object will get in-order delivery of events when using asynchronous delivery. No delivery order is guaranteed for synchronous delivery to avoid any potential deadly embraces.

ListenerQueue objects are created as necessary to build a list of listeners that should receive a specific event or events. Once the list is created, the event can then be synchronously or asynchronously delivered to the list of listeners. After the event has been dispatched for delivery, the ListenerQueue object should be discarded as it is likely the list of listeners is stale. A new ListenerQueue object should be created when it is time to deliver another event. The Sets used to build the list of listeners must not change after being added to the list. @since 3.1

    ThreadGroup eventGroup = new ThreadGroup(
        "RSA EndpointDescriptionLocator ThreadGroup"); //$NON-NLS-1$
    eventGroup.setDaemon(true);
    eventManager = new EventManager(
        "RSA EndpointDescriptionLocator Dispatcher", eventGroup); //$NON-NLS-1$
    eventQueue = new ListenerQueue(eventManager);
    CopyOnWriteIdentityMap listeners = new CopyOnWriteIdentityMap();
    listeners.put(this, this);
    eventQueue.queueListeners(listeners.entrySet(), new EventDispatcher() {
      public void dispatchEvent(Object eventListener,
          Object listenerObject, int eventAction, Object eventObject) {

      while (iter.hasNext()) {
        EventHandlerWrapper wrapper = (EventHandlerWrapper) iter.next();
        listeners.put(wrapper, perm);
      }


      ListenerQueue listenerQueue = new ListenerQueue(currentManager);
      listenerQueue.queueListeners(listeners.entrySet(),
          eventHandlerTracker);
      if (isAsync) {
        listenerQueue.dispatchEventAsynchronous(0, event);
      } else {
        listenerQueue.dispatchEventSynchronous(0, event);
      }


      notifyPostLocalDispatch(event);


    }

Examples of org.eclipse.osgi.framework.eventmgr.ListenerQueue

Related Classes of org.eclipse.osgi.framework.eventmgr.ListenerQueue