/*

  * Copyright 2006-2011 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.core.impl.lifecycle;

 import javax.xml.namespace.QName;

 import org.kuali.rice.core.api.lifecycle.BaseLifecycle;

 import org.kuali.rice.core.api.lifecycle.Lifecycle;

 import org.kuali.rice.core.api.resourceloader.GlobalResourceLoader;

 /**

  * A lifecycle that wraps a service.  This fetches and calls a lifecycle available

  * in the GRL and calls lifecycle methods on that.

  *

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

  */

 public class ServiceDelegatingLifecycle extends BaseLifecycle {

         private static final org.apache.log4j.Logger LOG = org.apache.log4j.Logger.getLogger(BaseLifecycle.class);

         private QName serviceName;

         public ServiceDelegatingLifecycle(QName serviceName) {

                 this.serviceName = serviceName;

         }

         public ServiceDelegatingLifecycle(String serviceName) {

                 this(new QName(serviceName));

         }

         public void start() throws Exception {

             if (!isStarted()) {

                 loadService(this.serviceName).start();

             }

                 super.start();

         }

         public void stop() throws Exception {

             if (isStarted()) {

                     try {

                             Lifecycle lifecycle = loadService(this.serviceName);

                             if (lifecycle == null) {

                                     LOG.warn("Couldn't stop service, failed to locate service with name " + serviceName);

                             } else {

                                     lifecycle.stop();

                             }

                     } catch (Exception e) {

                             LOG.warn("couldn't stop service " + this.serviceName);

                             throw e;

                     }

             }

                 super.stop();

         }

         protected Lifecycle loadService(QName serviceName) {

             Object service = GlobalResourceLoader.getService(serviceName);

             if (service == null) {

                 return null;

             }

             if (!(service instanceof Lifecycle)) {

                 throw new RuntimeException("Service with name " + serviceName + " does not implement the Lifecycle interface!");

             }

             return (Lifecycle) service;

         }

 }