ServletContextAttributeListener


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