001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 */ 019 020 package javax.servlet.http; 021 022 import java.util.EventListener; 023 024 /** This listener interface can be implemented in order to 025 * get notifications of changes to the attribute lists of sessions within 026 * this web application. 027 * @since v 2.3 028 */ 029 030 public interface HttpSessionAttributeListener extends EventListener { 031 /** Notification that an attribute has been added to a session. Called after the attribute is added.*/ 032 public void attributeAdded ( HttpSessionBindingEvent se ); 033 /** Notification that an attribute has been removed from a session. Called after the attribute is removed. */ 034 public void attributeRemoved ( HttpSessionBindingEvent se ); 035 /** Notification that an attribute has been replaced in a session. Called after the attribute is replaced. */ 036 public void attributeReplaced ( HttpSessionBindingEvent se ); 037 038 } 039