/*

  * 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.config;

 import org.kuali.rice.kcb.service.GlobalKCBServiceLocator;

 import org.kuali.rice.ksb.service.KSBServiceLocator;

 import org.quartz.JobDetail;

 import org.quartz.ObjectAlreadyExistsException;

 import org.quartz.Scheduler;

 import org.quartz.SchedulerException;

 import org.quartz.Trigger;

 import org.springframework.beans.BeansException;

 import org.springframework.beans.factory.BeanFactory;

 import org.springframework.beans.factory.BeanFactoryAware;

 import org.springframework.beans.factory.DisposableBean;

 import org.springframework.beans.factory.InitializingBean;

 import org.springframework.beans.factory.annotation.Required;

 /**

  * Initializing bean that initializes KCB (specifically the GlobalKCBServiceLocator)

  * on Spring context initialization.  This bean should be eagerly initialized (not marked lazy) 

  * 

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

  */

 public class KCBInitializer implements BeanFactoryAware, InitializingBean, DisposableBean {

     private BeanFactory beanFactory;

     private Trigger messageProcessingTrigger;

     private JobDetail messageProcessingJobDetail;

     protected Scheduler scheduler;

         /**

      * @see org.springframework.beans.factory.BeanFactoryAware#setBeanFactory(org.springframework.beans.factory.BeanFactory)

      */

     public void setBeanFactory(BeanFactory beanFactory) throws BeansException {

         this.beanFactory = beanFactory;

     }

     /**

      * Sets the Trigger for the message processing job

      * @param messageProcessingTrigger the Trigger for the message processing job

      */

     @Required

     public void setMessageProcessingTrigger(Trigger messageProcessingTrigger) {

         this.messageProcessingTrigger = messageProcessingTrigger;

     }

     /**

      * Sets the JobDetail for the message processing job

      * @param messageProcessingJobDetail the JobDetail for the message processing job

      */

     @Required

     public void setMessageProcessingJobDetail(JobDetail messageProcessingJobDetail) {

         this.messageProcessingJobDetail = messageProcessingJobDetail;

     }

     /**

      * @see org.springframework.beans.factory.InitializingBean#afterPropertiesSet()

      */

     public void afterPropertiesSet() throws Exception {

         GlobalKCBServiceLocator.init(beanFactory);

         // kill the reference, our job is done

         beanFactory = null;

         Scheduler scheduler = getScheduler()==null?KSBServiceLocator.getScheduler():getScheduler();

         scheduler.addJob(messageProcessingJobDetail, true);

         addTriggerToScheduler(messageProcessingTrigger);

     }

     private void addTriggerToScheduler(Trigger trigger) throws SchedulerException {

                 boolean triggerExists = (getScheduler().getTrigger(trigger.getName(), trigger.getGroup()) != null);

                 if (!triggerExists) {

                         try {

                                 getScheduler().scheduleJob(trigger);

                         } catch (ObjectAlreadyExistsException ex) {

                                 getScheduler().rescheduleJob(trigger.getName(), trigger.getGroup(), trigger);

                         }

                 } else {

                     getScheduler().rescheduleJob(trigger.getName(), trigger.getGroup(), trigger);

                 }

         }

     public void destroy() throws Exception {

         // prevent anything from accessing our services after the module has been destroyed/shutdown

         // our module's lifecycle is tied to the Spring context lifecycle for now

         GlobalKCBServiceLocator.destroy();

     }

         /**

          * @return the scheduler

          */

         public Scheduler getScheduler() {

                 return this.scheduler;

         }

         /**

          * @param scheduler the scheduler to set

          */

         public void setScheduler(Scheduler scheduler) {

                 this.scheduler = scheduler;

         }

 }