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<h2 title="Interface EventHandler" class="title">Interface EventHandler</h2>
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<pre>public interface <span class="strong">EventHandler</span></pre>
<div class="block">Listener for Events.
<p>
<code>EventHandler</code> objects are registered with the Framework service
registry and are notified with an <code>Event</code> object when an event is sent
or posted.
<p>
<code>EventHandler</code> objects can inspect the received <code>Event</code> object to
determine its topic and properties.
<p>
<code>EventHandler</code> objects must be registered with a service property
<a href="../../../../org/osgi/service/event/EventConstants.html#EVENT_TOPIC"><code>EventConstants.EVENT_TOPIC</code></a> whose value is the list of topics in which
the event handler is interested.
<p>
For example:
<pre>
String[] topics = new String[] {"com/isv/*"};
Hashtable ht = new Hashtable();
ht.put(EventConstants.EVENT_TOPIC, topics);
context.registerService(EventHandler.class.getName(), this, ht);
</pre>
Event Handler services can also be registered with an
<a href="../../../../org/osgi/service/event/EventConstants.html#EVENT_FILTER"><code>EventConstants.EVENT_FILTER</code></a> service property to further filter the
events. 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.
<p>
Security Considerations. Bundles wishing to monitor <code>Event</code> objects
will require <code>ServicePermission[EventHandler,REGISTER]</code> to register an
<code>EventHandler</code> service. The bundle must also have
<code>TopicPermission[topic,SUBSCRIBE]</code> for the topic specified in the event
in order to receive the event.</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../org/osgi/service/event/Event.html" title="class in org.osgi.service.event"><code>Event</code></a></dd></dl>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/osgi/service/event/EventHandler.html#handleEvent(org.osgi.service.event.Event)">handleEvent</a></strong>(<a href="../../../../org/osgi/service/event/Event.html" title="class in org.osgi.service.event">Event</a> event)</code>
<div class="block">Called by the <a href="../../../../org/osgi/service/event/EventAdmin.html" title="interface in org.osgi.service.event"><code>EventAdmin</code></a> service to notify the listener of an
event.</div>
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<h4>handleEvent</h4>
<pre>void handleEvent(<a href="../../../../org/osgi/service/event/Event.html" title="class in org.osgi.service.event">Event</a> event)</pre>
<div class="block">Called by the <a href="../../../../org/osgi/service/event/EventAdmin.html" title="interface in org.osgi.service.event"><code>EventAdmin</code></a> service to notify the listener of an
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<dl><dt><span class="strong">Parameters:</span></dt><dd><code>event</code> - The event that occurred.</dd></dl>
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