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            /** This listener interface can be implemented in order to
025            * get notifications of changes to the attribute lists of sessions within
026            * this web application.
027            * @since        v 2.3
028    */
029    
030    public interface HttpSessionAttributeListener extends EventListener {
031            /** Notification that an attribute has been added to a session. Called after the attribute is added.*/
032        public void attributeAdded ( HttpSessionBindingEvent se );
033            /** Notification that an attribute has been removed from a session. Called after the attribute is removed. */
034        public void attributeRemoved ( HttpSessionBindingEvent se );
035            /** Notification that an attribute has been replaced in a session. Called after the attribute is replaced. */
036        public void attributeReplaced ( HttpSessionBindingEvent se );
037    
038    }
039