01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * 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: }
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