/*
 * $Header: /cvshome/build/org.osgi.service.wireadmin/src/org/osgi/service/wireadmin/WireAdminListener.java,v 1.9 2006/06/16 16:31:43 hargrave Exp $
 *
 * Copyright (c) OSGi Alliance (2002, 2006). 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.wireadmin;

/**
 * Listener for Wire Admin Events.
 * 
 * <p>
 * <code>WireAdminListener</code> objects are registered with the Framework
 * service registry and are notified with a <code>WireAdminEvent</code> object
 * when an event is broadcast.
 * <p>
 * <code>WireAdminListener</code> objects can inspect the received
 * <code>WireAdminEvent</code> object to determine its type, the <code>Wire</code>
 * object with which it is associated, and the Wire Admin service that
 * broadcasts the event.
 * 
 * <p>
 * <code>WireAdminListener</code> objects must be registered with a service
 * property {@link WireConstants#WIREADMIN_EVENTS}whose value is a bitwise OR
 * of all the event types the listener is interested in receiving.
 * <p>
 * For example:
 * 
 * <pre>
 * Integer mask = new Integer(WIRE_TRACE | WIRE_CONNECTED | WIRE_DISCONNECTED);
 * Hashtable ht = new Hashtable();
 * ht.put(WIREADMIN_EVENTS, mask);
 * context.registerService(WireAdminListener.class.getName(), this, ht);
 * </pre>
 * 
 * If a <code>WireAdminListener</code> object is registered without a service
 * property {@link WireConstants#WIREADMIN_EVENTS}, then the
 * <code>WireAdminListener</code> will receive no events.
 * 
 * <p>
 * Security Considerations. Bundles wishing to monitor <code>WireAdminEvent</code>
 * objects will require <code>ServicePermission[WireAdminListener,REGISTER]</code>
 * to register a <code>WireAdminListener</code> service. Since
 * <code>WireAdminEvent</code> objects contain <code>Wire</code> objects, care must
 * be taken in assigning permission to register a <code>WireAdminListener</code>
 * service.
 * 
 * @see WireAdminEvent
 * 
 * @version $Revision: 1.9 $
 */
public interface WireAdminListener {
	/**
	 * Receives notification of a broadcast <code>WireAdminEvent</code> object.
	 * 
	 * The event object will be of an event type specified in this
	 * <code>WireAdminListener</code> service's
	 * {@link WireConstants#WIREADMIN_EVENTS}service property.
	 * 
	 * @param event The <code>WireAdminEvent</code> object.
	 */
	void wireAdminEvent(WireAdminEvent event);
}