| InstancePool.java |
1 /**
2 * Copyright (c) 2000-2007 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 Object get(String className) {
40 return _instance._get(className);
41 }
42
43 public static void put(String className, Object obj) {
44 _instance._put(className, obj);
45 }
46
47 private InstancePool() {
48 _classPool = new HashMap();
49 }
50
51 private Object _get(String className) {
52 className = className.trim();
53
54 Object obj = _classPool.get(className);
55
56 if (obj == null) {
57 ClassLoader portalClassLoader =
58 PortalClassLoaderUtil.getClassLoader();
59
60 try {
61 Class classObj = portalClassLoader.loadClass(className);
62
63 obj = classObj.newInstance();
64
65 _put(className, obj);
66 }
67 catch (Exception e1) {
68 if (_log.isWarnEnabled()) {
69 _log.warn(
70 "Unable to load " + className +
71 " with the portal class loader",
72 e1);
73 }
74
75 ClassLoader contextClassLoader =
76 Thread.currentThread().getContextClassLoader();
77
78 try {
79 Class classObj = contextClassLoader.loadClass(className);
80
81 obj = classObj.newInstance();
82
83 _put(className, obj);
84 }
85 catch (Exception e2) {
86 _log.error(
87 "Unable to load " + className +
88 " with the portal class loader or the current " +
89 "context class loader",
90 e2);
91 }
92 }
93 }
94
95 return obj;
96 }
97
98 private void _put(String className, Object obj) {
99 _classPool.put(className, obj);
100 }
101
102 private static Log _log = LogFactoryUtil.getLog(InstancePool.class);
103
104 private static InstancePool _instance = new InstancePool();
105
106 private Map _classPool;
107
108 }