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    /**
025     * Implementations of this interface receive notifications about
026     * changes to the servlet context of the web application they are
027     * part of.
028     * To receive notification events, the implementation class
029     * must be configured in the deployment descriptor for the web
030     * application.
031     *
032     * @version $Rev: 788194 $ $Date: 2009-06-24 18:05:48 -0400 (Wed, 24 Jun 2009) $
033     * @see ServletContextEvent
034     * @since v 2.3
035     */
036    
037    public interface ServletContextListener extends EventListener {
038    
039        /**
040         * Notification that the web application initialization
041         * process is starting.
042         * All ServletContextListeners are notified of context
043         * initialization before any filter or servlet in the web
044         * application is initialized.
045         */
046        void contextInitialized(ServletContextEvent sce);
047    
048        /**
049         * Notification that the servlet context is about to be shut down.
050         * All servlets and filters have been destroy()ed before any
051         * ServletContextListeners are notified of context
052         * destruction.
053         */
054        void contextDestroyed(ServletContextEvent sce);
055        
056    }
057