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 $

    tracker.close();
  }




  public Object addingService(ServiceReference serviceReference) {
    EventHandler eh = (EventHandler) bc.getService(serviceReference);
    if(eh != null) {
      return TrackedEventHandler.create(this, serviceReference, eh);
    } else {
      return null;
    }

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        final List<ServiceRegistration> registrations = new ArrayList<ServiceRegistration>();
        final List<Thread> threads = new ArrayList<Thread>();
        final AtomicLong finishedThreads = new AtomicLong();


        final ServiceRegistration eventHandler = this.registerEventHandler("org/apache/sling/event/notification/job/*",
                new EventHandler() {


                    @Override
                    public void handleEvent(final Event event) {
                        final String topic = (String) event.getProperty(NotificationConstants.NOTIFICATION_PROPERTY_JOB_TOPIC);
                        if ( NotificationConstants.TOPIC_JOB_FINISHED.equals(event.getTopic())) {

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    @Test(timeout = DEFAULT_TEST_TIMEOUT)
    public void testSimpleJobExecutionUsingBridge() throws Exception {
        final Barrier cb = new Barrier(2);


        final ServiceRegistration reg = this.registerEventHandler(TOPIC,
                new EventHandler() {
                    @Override
                    public void handleEvent(Event event) {
                        JobUtil.acknowledgeJob(event);
                        JobUtil.finishedJob(event);
                        cb.block();

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                    }


                 });
        final AtomicInteger count = new AtomicInteger(0);
        final ServiceRegistration reg2 = this.registerEventHandler(NotificationConstants.TOPIC_JOB_FINISHED,
                new EventHandler() {
                    @Override
                    public void handleEvent(Event event) {
                        count.incrementAndGet();
                    }
                 });

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                        }
                        return JobResult.FAILED;
                    }
                });
        final ServiceRegistration eh1Reg = this.registerEventHandler(NotificationConstants.TOPIC_JOB_CANCELLED,
                new EventHandler() {


                    @Override
                    public void handleEvent(Event event) {
                        final String id = (String)event.getProperty("id");
                        cancelled.add(id);
                    }
                });
        final ServiceRegistration eh2Reg = this.registerEventHandler(NotificationConstants.TOPIC_JOB_FAILED,
                new EventHandler() {


                    @Override
                    public void handleEvent(Event event) {
                        final String id = (String)event.getProperty("id");
                        failed.add(id);
                    }
                });
        final ServiceRegistration eh3Reg = this.registerEventHandler(NotificationConstants.TOPIC_JOB_FINISHED,
                new EventHandler() {


                    @Override
                    public void handleEvent(Event event) {
                        final String id = (String)event.getProperty("id");
                        finished.add(id);
                    }
                });
        final ServiceRegistration eh4Reg = this.registerEventHandler(NotificationConstants.TOPIC_JOB_STARTED,
                new EventHandler() {


                    @Override
                    public void handleEvent(Event event) {
                        final String id = (String)event.getProperty("id");
                        started.add(id);

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    @Test(timeout = DEFAULT_TEST_TIMEOUT)
    public void testTimedJob() throws Exception {
        final AtomicInteger counter = new AtomicInteger();


        final ServiceRegistration ehReg = this.registerEventHandler(TOPIC, new EventHandler() {


            @Override
            public void handleEvent(final Event event) {
                if ( TOPIC.equals(event.getTopic()) ) {
                    counter.incrementAndGet();

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    @Test(timeout = DEFAULT_TEST_TIMEOUT)
    public void testPeriodicTimedJob() throws Exception {
        final AtomicInteger counter = new AtomicInteger();


        final ServiceRegistration ehReg = this.registerEventHandler(TOPIC, new EventHandler() {


            @Override
            public void handleEvent(final Event event) {
                if ( TOPIC.equals(event.getTopic()) ) {
                    counter.incrementAndGet();

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                        processedJobsCount.incrementAndGet();
                        return JobResult.OK;
                    }
                });
        final ServiceRegistration ehReg = this.registerEventHandler(NotificationConstants.TOPIC_JOB_FINISHED,
                new EventHandler() {


                    @Override
                    public void handleEvent(Event event) {
                        finishedEvents.add(event);
                    }

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                        failedJobsCount.incrementAndGet();
                        return JobResult.OK;
                    }
                });
        final ServiceRegistration ehReg = this.registerEventHandler(NotificationConstants.TOPIC_JOB_FINISHED,
                new EventHandler() {


                    @Override
                    public void handleEvent(Event event) {
                        finishedEvents.add(event);
                    }

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                        parallelCount.decrementAndGet();
                        return JobResult.OK;
                    }
                });
        final ServiceRegistration ehReg = this.registerEventHandler(NotificationConstants.TOPIC_JOB_FINISHED,
                new EventHandler() {


                    @Override
                    public void handleEvent(final Event event) {
                        count.incrementAndGet();
                    }

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