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 /*
  * Copyright (c) OSGi Alliance (2004, 2011). All Rights Reserved.
  * 
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.osgi.service.dmt;
Registered implementations of this class are notified via DmtEvent 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 DmtSession is opened in atomic mode, DMT events are only sent when the session is committed, when the changes are actually performed.

Dmt Event Listener services must have permission org.osgi.service.dmt.security.DmtPermission.GET for the nodes in the nodes and newNodes property in the Dmt Event.

Version:
$Id: 2e9b8ddbca855b35c3c13bc5d8e7b0dfff89308a $
public interface DmtEventListener {

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 String+.
	String FILTER_SUBTREE = "osgi.filter.subtree";

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 Get rights. The type of this service property is String+.
	String FILTER_PRINCIPAL = "osgi.filter.principal";

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 Integer.
	String FILTER_EVENT = "osgi.filter.event";

DmtAdmin uses this method to notify the registered listeners about the change. This method is called asynchronously from the actual event occurrence.

Parameters:
event the DmtEvent describing the change in detail
	void changeOccurred(DmtEvent event);
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