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Java > Open Source Codes > javax > servlet > 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 JavaDoc;
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 JavaDoc {
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 JavaDoc 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 JavaDoc 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 JavaDoc srae);
49 }
50
51
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