| InstancePool.java |
1 /**
2 * Copyright (c) 2000-2008 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.kernel.util;
24
25 import com.liferay.portal.kernel.log.Log;
26 import com.liferay.portal.kernel.log.LogFactoryUtil;
27
28 import java.util.HashMap;
29 import java.util.Map;
30
31 /**
32 * <a href="InstancePool.java.html"><b><i>View Source</i></b></a>
33 *
34 * @author Brian Wing Shun Chan
35 *
36 */
37 public class InstancePool {
38
39 public static boolean contains(String className) {
40 return _instance._contains(className);
41 }
42
43 public static Object get(String className) {
44 return _instance._get(className);
45 }
46
47 public static void put(String className, Object obj) {
48 _instance._put(className, obj);
49 }
50
51 private InstancePool() {
52 _classPool = new HashMap<String, Object>();
53 }
54
55 private boolean _contains(String className) {
56 className = className.trim();
57
58 return _classPool.containsKey(className);
59 }
60
61 private Object _get(String className) {
62 className = className.trim();
63
64 Object obj = _classPool.get(className);
65
66 if (obj == null) {
67 ClassLoader portalClassLoader =
68 PortalClassLoaderUtil.getClassLoader();
69
70 try {
71 Class<?> classObj = portalClassLoader.loadClass(className);
72
73 obj = classObj.newInstance();
74
75 _put(className, obj);
76 }
77 catch (Exception e1) {
78 if (_log.isWarnEnabled()) {
79 _log.warn(
80 "Unable to load " + className +
81 " with the portal class loader",
82 e1);
83 }
84
85 ClassLoader contextClassLoader =
86 Thread.currentThread().getContextClassLoader();
87
88 try {
89 Class<?> classObj = contextClassLoader.loadClass(className);
90
91 obj = classObj.newInstance();
92
93 _put(className, obj);
94 }
95 catch (Exception e2) {
96 _log.error(
97 "Unable to load " + className +
98 " with the portal class loader or the current " +
99 "context class loader",
100 e2);
101 }
102 }
103 }
104
105 return obj;
106 }
107
108 private void _put(String className, Object obj) {
109 className = className.trim();
110
111 _classPool.put(className, obj);
112 }
113
114 private static Log _log = LogFactoryUtil.getLog(InstancePool.class);
115
116 private static InstancePool _instance = new InstancePool();
117
118 private Map<String, Object> _classPool;
119
120 }