1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, 13 * software distributed under the License is distributed on an 14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 15 * KIND, either express or implied. See the License for the 16 * specific language governing permissions and limitations 17 * under the License. 18 */ 19 20 package javax.servlet.http; 21 22 import java.util.EventListener; 23 24 /** 25 * Causes an object to be notified when it is bound to 26 * or unbound from a session. The object is notified 27 * by an {@link HttpSessionBindingEvent} object. This may be as a result 28 * of a servlet programmer explicitly unbinding an attribute from a session, 29 * due to a session being invalidated, or due to a session timing out. 30 * 31 * 32 * @author Various 33 * @version $Version$ 34 * 35 * @see HttpSession 36 * @see HttpSessionBindingEvent 37 */ 38 public interface HttpSessionBindingListener extends EventListener { 39 /** 40 * 41 * Notifies the object that it is being bound to 42 * a session and identifies the session. 43 * 44 * @param event the event that identifies the 45 * session 46 * 47 * @see #valueUnbound 48 * 49 */ 50 51 public void valueBound(HttpSessionBindingEvent event); 52 53 54 55 /** 56 * 57 * Notifies the object that it is being unbound 58 * from a session and identifies the session. 59 * 60 * @param event the event that identifies 61 * the session 62 * 63 * @see #valueBound 64 * 65 */ 66 67 public void valueUnbound(HttpSessionBindingEvent event); 68 69 70 } 71