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     * A ServletRequestListener can be implemented by the developer
026     * interested in being notified of requests coming in and out of
027     * scope in a web component. A request is defined as coming into
028     * scope when it is about to enter the first servlet or filter
029     * in each web application, as going out of scope when it exits
030     * the last servlet or the first filter in the chain.
031     *
032     * @since Servlet 2.4
033     * @version $Rev: 788194 $ $Date: 2009-06-24 18:05:48 -0400 (Wed, 24 Jun 2009) $
034     */
035    
036    public interface ServletRequestListener extends EventListener {
037    
038        /**
039         * The request is about to go out of scope of the web application.
040         *
041         * @param sre event containing request
042         */
043        void requestDestroyed(ServletRequestEvent sre);
044    
045        /**
046         * The request is about to come into scope of the web application.
047         *
048         * @param sre event containing request
049         */
050        void requestInitialized(ServletRequestEvent sre);
051    
052    }