/*

  * Copyright 2007-2008 The Kuali Foundation

  *

  * Licensed under the Educational Community License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  *

  * http://www.opensource.org/licenses/ecl2.php

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package org.kuali.rice.kcb.service;

 import java.lang.reflect.Proxy;

 import org.apache.log4j.Logger;

 import org.kuali.rice.kcb.util.BeanFactoryInvocationHandler;

 import org.springframework.beans.factory.BeanFactory;

 /**

  * Class that holds a singleton reference to KCBServiceLocator 

  * @author Kuali Rice Team (rice.collab@kuali.org)

  */

 public class GlobalKCBServiceLocator {

     private static final Logger LOG = Logger.getLogger(GlobalKCBServiceLocator.class);

     /**

      * The KCBServiceLocator singleton

      */

     private static KCBServiceLocator locator;

     /**

      * The global initializer that constructs the KCBServiceLocator singleton

      * @param beanFactory the beanFactory from which to construct the KCBServiceLocator

      */

     public static synchronized void init(BeanFactory beanFactory) {

 //        LOG.error("INITIALIZING", new Exception());

         if (locator != null) {

             throw new IllegalStateException("GlobalNotificationServiceLocator already initialized");

         }

         locator = (KCBServiceLocator) Proxy.newProxyInstance(GlobalKCBServiceLocator.class.getClassLoader(),

                                                              new Class[] { KCBServiceLocator.class },

                                                              new BeanFactoryInvocationHandler(beanFactory));

     }

     /**

      * Returns whether the GlobalKCBServiceLocator has already been initialized (classloader scoped)

      * @return whether the GlobalKCBServiceLocator has already been initialized (classloader scoped)

      */

     public static synchronized boolean isInitialized() {

         return locator != null;

     }

     /**

      * Un-sets the KCBServiceLocator singleton, in order to fulfill a "lifecycle"

      * contract (whereby init may be called again in the same class loader), specifically for

      * unit tests.

      */

     public static synchronized void destroy() {

         //LOG.debug("DESTROYING", new Exception());

         locator = null;

     }

     /**

      * Returns the KCBServiceLocator singleton

      * @return the KCBServiceLocator singleton

      */

     public static synchronized KCBServiceLocator getInstance() {

         return locator;

     }

 }