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 /** This listener interface can be implemented in order to 25 * get notifications of changes to the attribute lists of sessions within 26 * this web application. 27 * @since v 2.3 28 */ 29 30 public interface HttpSessionAttributeListener extends EventListener { 31 /** Notification that an attribute has been added to a session. Called after the attribute is added.*/ 32 public void attributeAdded ( HttpSessionBindingEvent se ); 33 /** Notification that an attribute has been removed from a session. Called after the attribute is removed. */ 34 public void attributeRemoved ( HttpSessionBindingEvent se ); 35 /** Notification that an attribute has been replaced in a session. Called after the attribute is replaced. */ 36 public void attributeReplaced ( HttpSessionBindingEvent se ); 37 38 } 39