ServletRequestAttributeListener


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      /**
22       * A ServletRequestAttributeListener can be implemented by the
23       * developer interested in being notified of request attribute
24       * changes. Notifications will be generated while the request
25       * is within the scope of the web application in which the listener
26       * is registered. A request is defined as coming into scope when
27       * it is about to enter the first servlet or filter in each web
28       * application, as going out of scope when it exits the last servlet
29       * or the first filter in the chain.
30       *
31       * @since Servlet 2.4
32       */
33  
34  public interface ServletRequestAttributeListener extends EventListener   {
35      /** Notification that a new attribute was added to the
36       ** servlet request. Called after the attribute is added.
37       */
38      public void attributeAdded(ServletRequestAttributeEvent   srae);
39  
40      /** Notification that an existing attribute has been removed from the
41       ** servlet request. Called after the attribute is removed.
42       */
43      public void attributeRemoved(ServletRequestAttributeEvent   srae);
44  
45      /** Notification that an attribute was replaced on the
46       ** servlet request. Called after the attribute is replaced.
47       */
48      public void attributeReplaced(ServletRequestAttributeEvent   srae);
49  }
50  
51
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