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EventHandler
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org.osgi.service.event</FONT>
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Interface EventHandler</H2>
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<DT><PRE>public interface <B>EventHandler</B></DL>
</PRE>
<P>
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.
<P>
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../org/osgi/service/event/Event.html" title="class in org.osgi.service.event"><CODE>Event</CODE></A></DL>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/event/EventHandler.html#handleEvent(org.osgi.service.event.Event)">handleEvent</A></B>(<A HREF="../../../../org/osgi/service/event/Event.html" title="class in org.osgi.service.event">Event</A> event)</CODE>
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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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<A NAME="handleEvent(org.osgi.service.event.Event)"><!-- --></A><H3>
handleEvent</H3>
<PRE>
void <B>handleEvent</B>(<A HREF="../../../../org/osgi/service/event/Event.html" title="class in org.osgi.service.event">Event</A> event)</PRE>
<DL>
<DD>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.
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<DD><DL>
<DT><B>Parameters:</B><DD><CODE>event</CODE> - The event that occurred.</DL>
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