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
18 package javax.servlet.http;
19
20 import java.util.EventListener;
21
22
23
24
25
26 /**
27 * Causes an object to be notified when it is bound to
28 * or unbound from a session. The object is notified
29 * by an {@link HttpSessionBindingEvent} object. This may be as a result
30 * of a servlet programmer explicitly unbinding an attribute from a session,
31 * due to a session being invalidated, or due to a session timing out.
32 *
33 *
34 * @author Various
35 * @version $Version$
36 *
37 * @see HttpSession
38 * @see HttpSessionBindingEvent
39 *
40 */
41
42 public interface HttpSessionBindingListener extends EventListener {
43
44
45
46 /**
47 *
48 * Notifies the object that it is being bound to
49 * a session and identifies the session.
50 *
51 * @param event the event that identifies the
52 * session
53 *
54 * @see #valueUnbound
55 *
56 */
57
58 public void valueBound(HttpSessionBindingEvent event);
59
60
61
62 /**
63 *
64 * Notifies the object that it is being unbound
65 * from a session and identifies the session.
66 *
67 * @param event the event that identifies
68 * the session
69 *
70 * @see #valueBound
71 *
72 */
73
74 public void valueUnbound(HttpSessionBindingEvent event);
75
76
77 }
78