| SharedSessionAttributeCache.java |
1 /**
2 * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to deal
6 * in the Software without restriction, including without limitation the rights
7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8 * copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20 * SOFTWARE.
21 */
22
23 package com.liferay.portal.servlet;
24
25 import java.io.Serializable;
26
27 import java.util.Map;
28 import java.util.concurrent.ConcurrentHashMap;
29
30 import javax.servlet.http.HttpSession;
31
32 /**
33 * <a href="SharedSessionAttributeCache.java.html"><b><i>View Source</i></b></a>
34 *
35 * @author Michael C. Han
36 *
37 */
38 public class SharedSessionAttributeCache implements Serializable {
39
40 public static SharedSessionAttributeCache getInstance(HttpSession session) {
41 synchronized (session) {
42 SharedSessionAttributeCache cache =
43 (SharedSessionAttributeCache)session.getAttribute(_SESSION_KEY);
44
45 if (cache == null) {
46 cache = new SharedSessionAttributeCache();
47
48 session.setAttribute(_SESSION_KEY, cache);
49 }
50
51 return cache;
52 }
53 }
54
55 public boolean contains(String name) {
56 return _attributes.containsKey(name);
57 }
58
59 public Map<String, Object> getValues() {
60 return _attributes;
61 }
62
63 public void removeAttribute(String key) {
64 _attributes.remove(key);
65 }
66
67 public void setAttribute(String key, Object value) {
68 _attributes.put(key, value);
69 }
70
71 private SharedSessionAttributeCache() {
72 _attributes = new ConcurrentHashMap<String, Object>();
73 }
74
75 private static final String _SESSION_KEY =
76 SharedSessionAttributeCache.class.getName();
77
78 private Map<String, Object> _attributes;
79
80 }