/* * Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */package com.sun.nio.sctp; import java.net.SocketAddress; /** * Notification emitted when a destination address on a multi-homed peer * encounters a change. * * @since 1.7 */public abstract class PeerAddressChangeNotification    implements Notification{    /**     * Defines the type of address change event that occurred to the destination     * address on a multi-homed peer when it encounters a change of interface     * details.     *     * <P> Some of these events types are only generated when the association     * supports dynamic address reconfiguration, e.g. {@code SCTP_ADDR_ADDED},     * {@code SCTP_ADDR_REMOVED}, etc.     *     * @since 1.7     */    public enum AddressChangeEvent {        /**         * This address is now reachable.         */       ADDR_AVAILABLE,        /**        * The address specified can no longer be reached. Any data sent to this        * address is rerouted to an alternate until this address becomes reachable.        */       ADDR_UNREACHABLE,        /**        * The address is no longer part of the association.        */       ADDR_REMOVED,        /**        * The address is now part of the association.        */       ADDR_ADDED,        /**        * This address has now been made to be the primary destination address.        */       ADDR_MADE_PRIMARY,        /**        * This address has now been confirmed as a valid address.        */       ADDR_CONFIRMED;    }     /**     * Initializes a new instance of this class.     */    protected PeerAddressChangeNotification() {}     /**     * Returns the peer address.     *     * @return  The peer address     */    public abstract SocketAddress address();     /**     * Returns the association that this notification is applicable to.     *     * @return  The association whose peer address changed     */    public abstract Association association();     /**     * Returns the type of change event.     *     * @return  The event     */    public abstract AddressChangeEvent event();}