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     * Objects that are bound to a session may listen to container
026     * events notifying them that sessions will be passivated and that
027     * session will be activated. A container that migrates session between VMs
028     * or persists sessions is required to notify all attributes bound to sessions
029     * implementing HttpSessionActivationListener.
030     *
031     * @version $Rev: 788194 $ $Date: 2009-06-24 18:05:48 -0400 (Wed, 24 Jun 2009) $
032     * @since 2.3
033     */
034    
035    public interface HttpSessionActivationListener extends EventListener {
036    
037        /**
038         * Notification that the session is about to be passivated.
039         */
040        void sessionWillPassivate(HttpSessionEvent se);
041    
042        /**
043         * Notification that the session has just been activated.
044         */
045        void sessionDidActivate(HttpSessionEvent se);
046    } 
047