1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    * The contents of this file are subject to the terms of the Liferay Enterprise
5    * Subscription License ("License"). You may not use this file except in
6    * compliance with the License. You can obtain a copy of the License by
7    * contacting Liferay, Inc. See the License for the specific language governing
8    * permissions and limitations under the License, including but not limited to
9    * distribution rights of the Software.
10   *
11   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
12   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
14   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
15   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
16   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
17   * SOFTWARE.
18   */
19  
20  package com.liferay.portal.kernel.util;
21  
22  import com.liferay.portal.kernel.log.Log;
23  import com.liferay.portal.kernel.log.LogFactoryUtil;
24  
25  import java.util.HashMap;
26  import java.util.Map;
27  
28  /**
29   * <a href="InstancePool.java.html"><b><i>View Source</i></b></a>
30   *
31   * @author Brian Wing Shun Chan
32   *
33   */
34  public class InstancePool {
35  
36      public static boolean contains(String className) {
37          return _instance._contains(className);
38      }
39  
40      public static Object get(String className) {
41          return _instance._get(className);
42      }
43  
44      public static void put(String className, Object obj) {
45          _instance._put(className, obj);
46      }
47  
48      private InstancePool() {
49          _classPool = new HashMap<String, Object>();
50      }
51  
52      private boolean _contains(String className) {
53          className = className.trim();
54  
55          return _classPool.containsKey(className);
56      }
57  
58      private Object _get(String className) {
59          className = className.trim();
60  
61          Object obj = _classPool.get(className);
62  
63          if (obj == null) {
64              ClassLoader portalClassLoader =
65                  PortalClassLoaderUtil.getClassLoader();
66  
67              try {
68                  Class<?> classObj = portalClassLoader.loadClass(className);
69  
70                  obj = classObj.newInstance();
71  
72                  _put(className, obj);
73              }
74              catch (Exception e1) {
75                  if (_log.isWarnEnabled()) {
76                      _log.warn(
77                          "Unable to load " + className +
78                              " with the portal class loader",
79                          e1);
80                  }
81  
82                  Thread currentThread = Thread.currentThread();
83  
84                  ClassLoader contextClassLoader =
85                      currentThread.getContextClassLoader();
86  
87                  try {
88                      Class<?> classObj = contextClassLoader.loadClass(className);
89  
90                      obj = classObj.newInstance();
91  
92                      _put(className, obj);
93                  }
94                  catch (Exception e2) {
95                      _log.error(
96                          "Unable to load " + className +
97                              " with the portal class loader or the current " +
98                                  "context class loader",
99                          e2);
100                 }
101             }
102         }
103 
104         return obj;
105     }
106 
107     private void _put(String className, Object obj) {
108         className = className.trim();
109 
110         _classPool.put(className, obj);
111     }
112 
113     private static Log _log = LogFactoryUtil.getLog(InstancePool.class);
114 
115     private static InstancePool _instance = new InstancePool();
116 
117     private Map<String, Object> _classPool;
118 
119 }