Examples of org.osgi.service.event.EventHandler

org.osgi.service.event.EventHandler
Listener for Events.
{@code EventHandler} objects are registered with the Framework serviceregistry and are notified with an {@code Event} object when an event is sentor posted.
{@code EventHandler} objects can inspect the received {@code Event} object todetermine its topic and properties.
{@code EventHandler} objects must be registered with a service property{@link EventConstants#EVENT_TOPIC} whose value is the list of topics in whichthe event handler is interested.
For example:
```
 String[] topics = new String[] {"com/isv/*"}; Hashtable ht = new Hashtable(); ht.put(EventConstants.EVENT_TOPIC, topics); context.registerService(EventHandler.class.getName(), this, ht); 
```
Event Handler services can also be registered with an {@link EventConstants#EVENT_FILTER} service property to further filter theevents. If the syntax of this filter is invalid, then the Event Handler must be ignored by the Event Admin service. The Event Admin service should log a warning.
Security Considerations. Bundles wishing to monitor {@code Event} objectswill require {@code ServicePermission[EventHandler,REGISTER]} to register an{@code EventHandler} service. The bundle must also have{@code TopicPermission[topic,SUBSCRIBE]} for the topic specified in the eventin order to receive the event. @see Event @ThreadSafe @author $Id: 44528634004c1b036551712f94703a8b5a55cba4 $

        Dictionary<String, Object> properties = new Hashtable<String, Object>();
        properties.put(EventConstants.EVENT_TOPIC, "a/*");


        final CountDownLatch latch = new CountDownLatch(1);
        final AtomicInteger count = new AtomicInteger();
        ServiceRegistration sr = bundleContext.registerService(EventHandler.class.getName(), new EventHandler()
        {
            public void handleEvent(Event event)
            {
                try
                {

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            .setInterface(EventHandler.class.getName(), new Properties() {
                {
                    put(EventConstants.EVENT_TOPIC, "*");
                }
            })
            .setImplementation(new EventHandler() {
                @Override
                public void handleEvent(Event event) {
                    System.out.print("[EVENT] " + event.getTopic());
                    for (String key : event.getPropertyNames()) {
                        System.out.print(" " + key + "=" + event.getProperty(key));

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        final CountDownLatch topicLatch = new CountDownLatch(topicList.length);
        final CountDownLatch startLatch = new CountDownLatch(1);


        Component comp = m_dependencyManager.createComponent()
            .setInterface(EventHandler.class.getName(), topics)
            .setImplementation(new EventHandler() {
                @Override
                public void handleEvent(Event event) {
                    if (debug) {
                        System.err.println("Received event: " + event.getTopic());
                    }

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    /**
     * Send the event.
     */
    public void sendEvent(final Event event)
    {
        final EventHandler handlerService = this.obtain();
        if (handlerService == null)
        {
            return;
        }


        try
        {
            handlerService.handleEvent(event);
        }
        catch (final Throwable e)
        {
            // The spec says that we must catch exceptions and log them:
            LogWrapper.getLogger().log(

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        final IEventBroker eventBroker) throws CoreException {
    CCWPlugin.getTracer().trace(TraceOptions.LOG_INFO,
        "CCW Model Processor called.");


    eventBroker.subscribe(UIEvents.UILifeCycle.APP_STARTUP_COMPLETE,
        new EventHandler() {
          @Override
          public void handleEvent(Event event) {
            CCWPlugin.getTracer().trace(TraceOptions.LOG_INFO,
            "App startup complete, launching user plugins");
            try {

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        return handler;
      }
    }


    // we don't have the handler, so lets get it outside the sync region
    EventHandler tempHandler = (EventHandler) context.getService(reference);


    synchronized (this) {
      // do we still need the handler we just got?
      if (handler == null) {
        handler = tempHandler;

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    if ((perm != null) && (!bundle.hasPermission(perm))) {
      return;
    }


    // get handler service
    EventHandler handlerService = getHandler();
    if (handlerService == null) {
      return;
    }


    try {
      handlerService.handleEvent(event);
    } catch (Throwable t) {
      // log/handle any Throwable thrown by the listener
      log.log(LogService.LOG_ERROR, "Exception while dispatching event "+event+" to handler "+handlerService, t);
    }
  }

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    String[] topics = new String[] {topic};
    Dictionary<String, Object> d = new Hashtable<String, Object>();
    d.put(EventConstants.EVENT_TOPIC, topics);
    if (filter != null)
      d.put(EventConstants.EVENT_FILTER, filter);
    EventHandler wrappedHandler = new UIEventHandler(eventHandler, headless ? null : uiSync);
    ServiceRegistration registration = bundleContext.registerService(EventHandler.class.getName(), wrappedHandler, d);
    registrations.put(eventHandler, registration);
    return true;
  }

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      themeManager.setCurrentThemeId((String)context.get(E4Application.THEME_ID));
    }
  }
  
  void setupEventListener(IEventBroker eventBroker) {
    eventBroker.subscribe(UIEvents.UIElement.TOPIC_TOBERENDERED, new EventHandler() {
      
      public void handleEvent(Event event) {
        MUIElement changedObj = (MUIElement) event.getProperty(UIEvents.EventTags.ELEMENT);
        
        if (changedObj.isToBeRendered()) {

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        throw new IllegalStateException("There's no application with ID '" + applicationId + "' known.");
      } else if (col.size() > 1) {
        System.err.println("There are more than 1 application with ID '" + applicationId + "' known.");
        throw new IllegalStateException("There are more than 1 application with ID '" + applicationId + "' known.");
      } else {
        EventHandler handler = new EventHandler() {
          public void handleEvent(final Event event) {
            launched.set(false);
          }
        };

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