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     * This listener interface can be implemented in order to
026     * get notifications of changes to the attribute lists of sessions within
027     * this web application.
028     *
029     * @version $Rev: 788194 $ $Date: 2009-06-24 18:05:48 -0400 (Wed, 24 Jun 2009) $
030     * @since v 2.3
031     */
032    
033    public interface HttpSessionAttributeListener extends EventListener {
034        /**
035         * Notification that an attribute has been added to a session. Called after the attribute is added.
036         */
037        void attributeAdded(HttpSessionBindingEvent se);
038    
039        /**
040         * Notification that an attribute has been removed from a session. Called after the attribute is removed.
041         */
042        void attributeRemoved(HttpSessionBindingEvent se);
043    
044        /**
045         * Notification that an attribute has been replaced in a session. Called after the attribute is replaced.
046         */
047        void attributeReplaced(HttpSessionBindingEvent se);
048    
049    }
050