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.http;
021    
022    import java.util.EventListener;
023    
024            /** 
025            * Implementations of this interface are notified of changes to the 
026            * list of active sessions in a web application.
027            * To receive notification events, the implementation class
028            * must be configured in the deployment descriptor for the web application.
029            * @see HttpSessionEvent
030             * @since       v 2.3
031            */
032    
033    public interface HttpSessionListener extends EventListener {
034        
035            /** 
036            * Notification that a session was created.
037            * @param se the notification event
038            */
039        public void sessionCreated ( HttpSessionEvent se );
040        
041            /** 
042            * Notification that a session is about to be invalidated.
043            * @param se the notification event
044            */
045        public void sessionDestroyed ( HttpSessionEvent se );
046        
047    }
048