1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *  http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  
20  package javax.servlet.http;
21  
22  import java.util.EventListener;
23  
24  	/** This listener interface can be implemented in order to
25  	* get notifications of changes to the attribute lists of sessions within
26  	* this web application.
27  	* @since	v 2.3
28  */
29  
30  public interface HttpSessionAttributeListener extends EventListener {
31  	/** Notification that an attribute has been added to a session. Called after the attribute is added.*/
32      public void attributeAdded ( HttpSessionBindingEvent se );
33  	/** Notification that an attribute has been removed from a session. Called after the attribute is removed. */
34      public void attributeRemoved ( HttpSessionBindingEvent se );
35  	/** Notification that an attribute has been replaced in a session. Called after the attribute is replaced. */
36      public void attributeReplaced ( HttpSessionBindingEvent se );
37  
38  }
39