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; 21 22 import java.util.EventListener; 23 24 /** Implementations of this interface receive notifications of 25 ** changes to the attribute list on the servlet context of a web application. 26 * To receive notification events, the implementation class 27 * must be configured in the deployment descriptor for the web application. 28 * @see ServletContextAttributeEvent 29 * @since v 2.3 30 */ 31 32 public interface ServletContextAttributeListener extends EventListener { 33 /** Notification that a new attribute was added to the servlet context. Called after the attribute is added.*/ 34 public void attributeAdded(ServletContextAttributeEvent scab); 35 /** Notification that an existing attribute has been removed from the servlet context. Called after the attribute is removed.*/ 36 public void attributeRemoved(ServletContextAttributeEvent scab); 37 /** Notification that an attribute on the servlet context has been replaced. Called after the attribute is replaced. */ 38 public void attributeReplaced(ServletContextAttributeEvent scab); 39 } 40