/**

  * Copyright 2005-2011 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.ksb.impl.bus;

 import org.kuali.rice.ksb.api.bus.Endpoint;

 import org.kuali.rice.ksb.api.bus.ServiceConfiguration;

 import org.kuali.rice.ksb.messaging.serviceconnectors.ServiceConnectorFactory;

 public class LazyEndpoint implements Endpoint {

         private final Object lock = new Object();

         private final ServiceConfiguration serviceConfiguration;

         private volatile Object service;

         public LazyEndpoint(ServiceConfiguration serviceConfiguration) {

                 if (serviceConfiguration == null) {

                         throw new IllegalArgumentException("serviceConfiguration was null");

                 }

                 this.serviceConfiguration = serviceConfiguration;

         }

         @Override

         public ServiceConfiguration getServiceConfiguration() {

                 return this.serviceConfiguration;

         }

         @Override

         public Object getService() {

                 // double-checked locking idiom - see Effective Java, Item 71

                 Object internalService = this.service;

                 if (internalService == null) {

                         synchronized (lock) {

                                 internalService = this.service;

                                 if (internalService == null) {

                                         this.service = internalService = ServiceConnectorFactory.getServiceConnector(serviceConfiguration).getService(); 

                                 }

                         }

                 }

                 return internalService;

         }

 }