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
9 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 package javax.servlet;
19 import java.util.EventListener;
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.
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.
38 public void attributeAdded(ServletRequestAttributeEvent srae);
40 /** Notification that an existing attribute has been removed from the
41 ** servlet request. Called after the attribute is removed.
43 public void attributeRemoved(ServletRequestAttributeEvent srae);
45 /** Notification that an attribute was replaced on the
46 ** servlet request. Called after the attribute is replaced.
48 public void attributeReplaced(ServletRequestAttributeEvent srae);