1 /**
2 * Copyright 2005-2016 The Kuali Foundation
3 *
4 * Licensed under the Educational Community License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.opensource.org/licenses/ecl2.php
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 package org.kuali.rice.kcb.service;
17
18 import java.lang.reflect.Proxy;
19
20 import org.apache.log4j.Logger;
21 import org.kuali.rice.kcb.util.BeanFactoryInvocationHandler;
22 import org.springframework.beans.factory.BeanFactory;
23
24 /**
25 * Class that holds a singleton reference to KCBServiceLocator
26 * @author Kuali Rice Team (rice.collab@kuali.org)
27 */
28 public class GlobalKCBServiceLocator {
29 private static final Logger LOG = Logger.getLogger(GlobalKCBServiceLocator.class);
30
31 /**
32 * The KCBServiceLocator singleton
33 */
34 private static KCBServiceLocator locator;
35
36 /**
37 * The global initializer that constructs the KCBServiceLocator singleton
38 * @param beanFactory the beanFactory from which to construct the KCBServiceLocator
39 */
40 public static synchronized void init(BeanFactory beanFactory) {
41 // LOG.error("INITIALIZING", new Exception());
42 if (locator != null) {
43 throw new IllegalStateException("GlobalKCBServiceLocator already initialized");
44 }
45
46 locator = (KCBServiceLocator) Proxy.newProxyInstance(GlobalKCBServiceLocator.class.getClassLoader(),
47 new Class[] { KCBServiceLocator.class },
48 new BeanFactoryInvocationHandler(beanFactory));
49 }
50
51 /**
52 * Returns whether the GlobalKCBServiceLocator has already been initialized (classloader scoped)
53 * @return whether the GlobalKCBServiceLocator has already been initialized (classloader scoped)
54 */
55 public static synchronized boolean isInitialized() {
56 return locator != null;
57 }
58
59 /**
60 * Un-sets the KCBServiceLocator singleton, in order to fulfill a "lifecycle"
61 * contract (whereby init may be called again in the same class loader), specifically for
62 * unit tests.
63 */
64 public static synchronized void destroy() {
65 //LOG.debug("DESTROYING", new Exception());
66 locator = null;
67 }
68
69 /**
70 * Returns the KCBServiceLocator singleton
71 * @return the KCBServiceLocator singleton
72 */
73 public static synchronized KCBServiceLocator getInstance() {
74 return locator;
75 }
76 }