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 // 021 // This source code implements specifications defined by the Java 022 // Community Process. In order to remain compliant with the specification 023 // DO NOT add / change / or delete method signatures! 024 // 025 026 package javax.servlet; 027 028 import java.util.EventListener; 029 030 /** 031 * Implementations of this interface recieve notifications of 032 * changes to the attribute list on the servlet context of a web application. 033 * To recieve notification events, the implementation class 034 * must be configured in the deployment descriptor for the web application. 035 * 036 * @see ServletContextAttributeEvent 037 * 038 * @since Servlet 2.3 039 * 040 * @version $Rev: 467553 $ $Date: 2006-10-25 06:01:51 +0200 (Mi, 25. Okt 2006) $ 041 */ 042 public interface ServletContextAttributeListener extends EventListener { 043 /** 044 * Notification that a new attribute was added to the servlet context. 045 * Called after the attribute is added. 046 */ 047 public void attributeAdded(ServletContextAttributeEvent scab); 048 049 /** 050 * Notification that an existing attribute has been removed from the 051 * servlet context. Called after the attribute is removed. 052 */ 053 public void attributeRemoved(ServletContextAttributeEvent scab); 054 055 /** 056 * Notification that an attribute on the servlet context has been 057 * replaced. Called after the attribute is replaced. 058 */ 059 public void attributeReplaced(ServletContextAttributeEvent scab); 060 } 061