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<div class="subTitle">org.osgi.service.dmt</div>
<h2 title="Interface DmtEventListener" class="title">Interface DmtEventListener</h2>
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<pre>public interface <span class="typeNameLabel">DmtEventListener</span></pre>
<div class="block">Registered implementations of this class are notified via <a href="../../../../org/osgi/service/dmt/DmtEvent.html" title="interface in org.osgi.service.dmt"><code>DmtEvent</code></a>
objects about important changes in the tree. Events are generated after every
successful DMT change, and also when sessions are opened or closed. If a
<a href="../../../../org/osgi/service/dmt/DmtSession.html" title="interface in org.osgi.service.dmt"><code>DmtSession</code></a> is opened in atomic mode, DMT events are only sent when
the session is committed, when the changes are actually performed.
<p>
Dmt Event Listener services must have permission <a href="../../../../org/osgi/service/dmt/security/DmtPermission.html#GET"><code>DmtPermission.GET</code></a>
for the nodes in the <code>nodes</code> and <code>newNodes</code> property in the Dmt
Event.</div>
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<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/osgi/service/dmt/DmtEventListener.html#FILTER_EVENT">FILTER_EVENT</a></span></code>
<div class="block">A number of event types packed in a bitmap.</div>
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<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/osgi/service/dmt/DmtEventListener.html#FILTER_PRINCIPAL">FILTER_PRINCIPAL</a></span></code>
<div class="block">A number of names of principals.</div>
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<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/osgi/service/dmt/DmtEventListener.html#FILTER_SUBTREE">FILTER_SUBTREE</a></span></code>
<div class="block">A number of sub-tree top nodes that define the scope of the Dmt Event
Listener.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/osgi/service/dmt/DmtEventListener.html#changeOccurred-org.osgi.service.dmt.DmtEvent-">changeOccurred</a></span>(<a href="../../../../org/osgi/service/dmt/DmtEvent.html" title="interface in org.osgi.service.dmt">DmtEvent</a> event)</code>
<div class="block"><code>DmtAdmin</code> uses this method to notify the registered listeners
about the change.</div>
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<pre>static final java.lang.String FILTER_SUBTREE</pre>
<div class="block">A number of sub-tree top nodes that define the scope of the Dmt Event
Listener. If this service property is registered then the service must
only receive events for nodes that are part of one of the sub-trees. The
type of this service property is <code>String+</code>.</div>
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<dd><a href="../../../../constant-values.html#org.osgi.service.dmt.DmtEventListener.FILTER_SUBTREE">Constant Field Values</a></dd>
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<pre>static final java.lang.String FILTER_PRINCIPAL</pre>
<div class="block">A number of names of principals. If this service property is provided
with a Dmt Event Listener service registration than that listener must
only receive events for which at least one of the given principals has
<code>Get</code> rights. The type of this service property is <code>String+</code>.</div>
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<dd><a href="../../../../constant-values.html#org.osgi.service.dmt.DmtEventListener.FILTER_PRINCIPAL">Constant Field Values</a></dd>
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<pre>static final java.lang.String FILTER_EVENT</pre>
<div class="block">A number of event types packed in a bitmap. If this service property is
provided with a Dmt Event Listener service registration than that
listener must only receive events where one of the Dmt Event types occur
in the bitmap. The type of this service property must be <code>Integer</code>.</div>
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<dd><a href="../../../../constant-values.html#org.osgi.service.dmt.DmtEventListener.FILTER_EVENT">Constant Field Values</a></dd>
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<h4>changeOccurred</h4>
<pre>void changeOccurred(<a href="../../../../org/osgi/service/dmt/DmtEvent.html" title="interface in org.osgi.service.dmt">DmtEvent</a> event)</pre>
<div class="block"><code>DmtAdmin</code> uses this method to notify the registered listeners
about the change. This method is called asynchronously from the actual
event occurrence.</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>event</code> - the <code>DmtEvent</code> describing the change in detail</dd>
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