/*
* JBoss, the OpenSource J2EE webOS
*
* Distributable under LGPL license.
* See terms of license at gnu.org.
*/
package javax.management;
import org.jboss.mx.notification.ListenerRegistry;
import org.jboss.mx.notification.ListenerRegistration;
/**
* A helper class for notification broadcasters/emitters
*
* @author <a href="mailto:juha@jboss.org">Juha Lindfors</a>.
* @author <a href="mailto:Adrian.Brock@HappeningTimes.com">Adrian Brock</a>.
* @version $Revision: 1.5 $
*/
public class NotificationBroadcasterSupport
implements NotificationEmitter
{
/**
* No notifications is the default
*/
private static final MBeanNotificationInfo[] NO_NOTIFICATIONS = new MBeanNotificationInfo[0];
/**
* The registered listeners
*/
private ListenerRegistry registry = new ListenerRegistry();
/**
* Construct the new notification broadcaster support object
*/
public NotificationBroadcasterSupport()
{
}
public void addNotificationListener(NotificationListener listener,
NotificationFilter filter,
Object handback)
{
try
{
registry.add(listener, filter, handback);
}
catch (JMException e)
{
// This shouldn't happen?
throw new RuntimeException(e.toString());
}
}
public void removeNotificationListener(NotificationListener listener)
throws ListenerNotFoundException
{
registry.remove(listener);
}
public void removeNotificationListener(NotificationListener listener,
NotificationFilter filter,
Object handback)
throws ListenerNotFoundException
{
registry.remove(listener, filter, handback);
}
public MBeanNotificationInfo[] getNotificationInfo()
{
return NO_NOTIFICATIONS;
}
public void sendNotification(Notification notification)
{
ListenerRegistry.ListenerRegistrationIterator iterator = registry.iterator();
while (iterator.hasNext())
{
ListenerRegistration registration = iterator.nextRegistration();
NotificationFilter filter = registration.getFilter();
if (filter == null)
handleNotification(registration.getListener(), notification, registration.getHandback());
else if (filter.isNotificationEnabled(notification))
handleNotification(registration.getListener(), notification, registration.getHandback());
}
}
/**
* Handle the notification, the default implementation is to synchronously invoke the listener.
*
* @param listener the listener to notify
* @param notification the notification
* @param handback the handback object
*/
protected void handleNotification(NotificationListener listener,
Notification notification,
Object handback)
{
listener.handleNotification(notification, handback);
}
}