Examples of org.zkoss.zk.ui.event.EventQueue

org.zkoss.zk.ui.event.EventQueue
An event queue. An event queue is a many-to-many 'channel' to publish events and to subscribe event listeners ( {@link EventListener}).
Asynchronous and Synchronous Event Listeners

There are two kinds of event listeners: synchronous and asynchronous. A synchronous listener works the same as a normal event listener (listeners registered to a component ( {@link org.zkoss.zk.ui.Component#addEventListener}). It is executed one-by-one. No two event listeners belonging to the same desktop will be executed at the same time. In additions, it is invoked under an execution (i.e., {@link org.zkoss.zk.ui.Executions#getCurrent} never null).It is allowed to manipulate the components belonging to the current execution.
On the other hand, an asynchronous listener is executed asynchronously in another thread. It can not access the components belonging to any desktop. There is no current execution ( {@link org.zkoss.zk.ui.Executions#getCurrent} is null}.However, it is useful to make the application more responsive when executing a long operation. A typical use is to execute the long operation in an asynchronous listener, and then all other events can be processed concurrently. @author tomyeh @since 5.0.0


          // notification with title + message + selfClosing
          map.put("title", "Zksample2 Notification");
          map.put("message", "<br>Hello i'm a notification based on ZK-Gritter.<br><br>Many thanks to gekkio for writting the implementation.");
          map.put("autoClosing", false);
          EventQueue eq;
          eq = EventQueues.lookup("ApplicationEventQueue", EventQueues.APPLICATION, false);
          eq.publish(new Event("APPLICATION_NOTIFICATION", null, map));


          // notification with title + message + image
          map = new HashMap<String, Object>(0);
          map.put("title", "WOW !!!");
          map.put("message",
              "The notifications can hold a little image.<br><br> You can close me by clicking the 'x' in the left top corner shown when mouse is over.<br><br>Further you can stop/start the notifications with the checkbox <br>EN: 'stop notifications' <br>DE: 'Stoppe Benachrichtigungen'<br> on top right of the application.");
          map.put("autoClosing", true);
          map.put("image", "/images/sge.jpg");
          // EventQueues.lookup("ApplicationEventQueue",
          // EventQueues.APPLICATION, true).publish(new
          // Event("APPLICATION_NOTIFICATION", null, map));
          eq.publish(new Event("APPLICATION_NOTIFICATION", null, map));


        }
      });
      this.timer.setRunning(true);
    }

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  private void createApplicationMessageQueue() {


    if (!EventQueues.exists("ApplicationEventQueue", EventQueues.APPLICATION)) {


      // autoCreate EventQueue
      EventQueue eq = EventQueues.lookup("ApplicationEventQueue", EventQueues.APPLICATION, true);


      // listen
      eq.subscribe(new SerializableEventListener() {
        private static final long serialVersionUID = 1L;


        @SuppressWarnings("unchecked")
        public void onEvent(Event event) throws Exception {
          System.out.println("ApplicationEventQueue onEvent");


          if (event.getName().equals("APPLICATION_NOTIFICATION")) {
            Map<String, Object> map = (Map<String, Object>) event.getData();
            showNotification(map);
          }
        }
      });
    } else {
      // Get the EventQueue
      EventQueue eq = EventQueues.lookup("ApplicationEventQueue", EventQueues.APPLICATION, false);


      // NEW listen
      eq.subscribe(new SerializableEventListener() {
        private static final long serialVersionUID = 1L;


        @SuppressWarnings("unchecked")
        public void onEvent(Event event) throws Exception {

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    _bookname = bookname;
    _sheets = new HashMap<String, RefSheet>(3);
    _variableRefs = new ConcurrentHashMap<String, Ref>(4);
    _maxrow = maxrow;
    _maxcol = maxcol;
    EventQueue tmp = null;
    try {
      tmp = EventQueues.lookup(bookname);
    } catch(IllegalStateException ex) {
      //ignore for zsstest case(No execution)
    }

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    getEventQueue().unsubscribe(listener);
  }
  
  @Override
  public void publish(Event event) {
    final EventQueue que = getEventQueue();
    if (que != null) {
      que.publish(event);
    }
  }

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Examples of org.zkoss.zk.ui.event.EventQueue

Asynchronous and Synchronous Event Listeners

Related Classes of org.zkoss.zk.ui.event.EventQueue