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;
21  
22  import java.util.EventListener;
23  
24  	/** Implementations of this interface receive notifications of
25  	** changes to the attribute list on the servlet context of a web application. 
26  	* To receive notification events, the implementation class
27  	* must be configured in the deployment descriptor for the web application.
28  	* @see ServletContextAttributeEvent
29  	 * @since	v 2.3
30  	*/
31  
32  public interface ServletContextAttributeListener extends EventListener {
33  	/** Notification that a new attribute was added to the servlet context. Called after the attribute is added.*/
34  public void attributeAdded(ServletContextAttributeEvent scab);
35  	/** Notification that an existing attribute has been removed from the servlet context. Called after the attribute is removed.*/
36  public void attributeRemoved(ServletContextAttributeEvent scab);
37  	/** Notification that an attribute on the servlet context has been replaced. Called after the attribute is replaced. */
38  public void attributeReplaced(ServletContextAttributeEvent scab);
39  }
40