/*

  * 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.core.lifecycle;

 import java.util.LinkedList;

 import java.util.List;

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

 public abstract class BaseCompositeLifecycle extends BaseLifecycle {

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

         private List<Lifecycle> lifecycles;

         protected abstract List<Lifecycle> loadLifecycles() throws Exception;

         @Override

         public void start() throws Exception {

             this.lifecycles = loadLifecycles();

                 for (Lifecycle lifecycle : this.lifecycles) {

                         lifecycle.start();

                 }

                 super.start();

         }

         @Override

         public void stop() throws Exception {

                 for (Lifecycle lifecycle : reverseLifecycles()) {

                         try {

                                 lifecycle.stop();

                         } catch (Throwable t) {

                                 LOG.error("Failed to stop Lifecycle: " + lifecycle.getClass().getName(), t);

                         }

                 }

                 super.stop();

         }

         private List<Lifecycle> reverseLifecycles() {

                 LinkedList<Lifecycle> reversed = new LinkedList<Lifecycle>();

                 for (Lifecycle lifecycle : this.lifecycles) {

                         reversed.addFirst(lifecycle);

                 }

                 return reversed;

         }

 }