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; 021 022 import java.util.EventListener; 023 024 /** Implementations of this interface receive notifications of 025 ** changes to the attribute list on the servlet context of a web application. 026 * To receive notification events, the implementation class 027 * must be configured in the deployment descriptor for the web application. 028 * @see ServletContextAttributeEvent 029 * @since v 2.3 030 */ 031 032 public interface ServletContextAttributeListener extends EventListener { 033 /** Notification that a new attribute was added to the servlet context. Called after the attribute is added.*/ 034 public void attributeAdded(ServletContextAttributeEvent scab); 035 /** Notification that an existing attribute has been removed from the servlet context. Called after the attribute is removed.*/ 036 public void attributeRemoved(ServletContextAttributeEvent scab); 037 /** Notification that an attribute on the servlet context has been replaced. Called after the attribute is replaced. */ 038 public void attributeReplaced(ServletContextAttributeEvent scab); 039 } 040