/*
 * 
 * Copyright 2004 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * The contents of this file are subject to the Sun Community Source
 * License v3.0/Jini Technology Specific Attachment v 1.0 (the
 * "License"). You may not use this file except in compliance with the
 * License. You may obtain a copy of the License at
 * http://wwws.sun.com/software/jini/licensing/SCSL3_JiniTSA1.html.
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 * 
 * The Reference Code is Jini Technology Core Platform code, v2.0. The
 * Developer of the Reference Code is Sun Microsystems, Inc.
 * 
 * Contributor(s): Sun Microsystems, Inc.
 * 
 * The contents of this file comply with the Jini Technology Core
 * Platform Compatibility Kit, v2.0A.
 * 
 * Tester(s): Sun Microsystems, Inc.
 * 
 * Test Platform(s):
 * Java 2 SDK, Standard Edition, Version 1.4.2_03 for Solaris(TM)SPARC/x86
 * Java 2 SDK, Standard Edition, Version 1.4.2_03 for Linux (Intel x86)
 * Java 2 SDK, Standard Edition, Version 1.4.2_03 for Windows (Intel Platform)
 * 
 */
package net.jini.discovery;

/**
 * This interface must be implemented by entities that wish to receive
 * notification of the following events.
 * <p>
 *   <li> discovery of new lookup services
 *   <li> re-discovery of previously discovered but discarded lookup services
 *   <li> discard of previously discovered lookup services
 *   <li> changes in the member groups of previously discovered lookup services
 * <p>
 *
 * @author Sun Microsystems, Inc.
 *
 * @see net.jini.discovery.DiscoveryListener
 * @see net.jini.discovery.DiscoveryEvent
 * @see net.jini.discovery.LookupDiscovery
 */
public interface DiscoveryChangeListener extends DiscoveryListener {
    /**
     * Called when changes are detected in the discovery state of 
     * one or more of the previously discovered lookup services;
     * in particular, when changes occur in the member groups to
     * which those lookup services belong.
     * 
     * Note that implementations of this method should return quickly;
     * e.g., such implementations should never make remote invocations.
     *
     * @param e instance of <code>net.jini.discovery.DiscoveryEvent</code>
     *          representing the event that describes the lookup services
     *          whose discovery state has changed
     */
    void changed(DiscoveryEvent e);
}
