任務調度框架Quartz實現的跑批程序(五)

瞭解了Quartz基本原理後，再回頭看公司的程序：

BeanInvokingJobDetailFactoryBean 做爲自定義的實現，裏面有函數 afterPropertiesSet 調用了 

jobdetail,  而jobdetail 會使用內部類BeanInvokingJob,  BeanInvokingJob剛是用了反射進行調用各個job

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.quartz.Job;
import org.quartz.JobDetail;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.quartz.Scheduler;
import org.quartz.StatefulJob;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanNameAware;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.util.MethodInvoker;


public class BeanInvokingJobDetailFactoryBean implements 
FactoryBean, BeanNameAware, InitializingBean, ApplicationContextAware
{
	protected static ApplicationContext applicationContext;
	private Log logger = LogFactory.getLog(getClass());
	private String group = Scheduler.DEFAULT_GROUP;
	private boolean concurrent = true;
	private boolean durable = false;
	private boolean volatility = false;
	private boolean shouldRecover = false;
	private String[] jobListenerNames;
	private String beanName;
	private JobDetail jobDetail;
	private String targetBean;
	private String targetMethod;
	private Object[] arguments;
	
    //  targetBean getter setter 省略
	//  targetMethod getter setter 省略

	public Object getObject() throws Exception
	{
		return jobDetail;
	}
	public Class getObjectType()
	{
		return JobDetail.class;
	}
	public boolean isSingleton()
	{
		return true;
	}
	public void setBeanName(String beanName)
	{
		this.beanName = beanName;
	}
	public void afterPropertiesSet() throws Exception
	{
		try
		{
			logger.debug("start");
			logger.debug("Creating JobDetail "+beanName);
			jobDetail = new JobDetail();
			jobDetail.setName(beanName);
			jobDetail.setGroup(group);
			jobDetail.setJobClass(concurrent ? BeanInvokingJob.class : 
                                                         StatefulBeanInvokingJob.class);
			jobDetail.setDurability(durable);
			jobDetail.setVolatility(volatility);
			jobDetail.setRequestsRecovery(shouldRecover);
			jobDetail.getJobDataMap().put("targetBean", targetBean);
			jobDetail.getJobDataMap().put("targetMethod", targetMethod);
			jobDetail.getJobDataMap().put("arguments", arguments);
			
			logger.debug("Registering JobListener names with JobDetail object "+beanName);
			if (this.jobListenerNames != null) {
				for (int i = 0; i < this.jobListenerNames.length; i++) {
					this.jobDetail.addJobListener(this.jobListenerNames[i]);
				}
			}
			logger.info("Created JobDetail: "+jobDetail+"; targetBean: "+
            targetBean+"; targetMethod: "+targetMethod+"; arguments: "+arguments+";");
		}
		finally
		{
			logger.debug("end");
		}
	}
	public void setConcurrent(boolean concurrent)
	{
		this.concurrent = concurrent;
	}
	public void setDurable(boolean durable)
	{
		this.durable = durable;
	}
	public void setGroup(String group)
	{
		this.group = group;
	}
	public void setJobListenerNames(String[] jobListenerNames)
	{
		this.jobListenerNames = jobListenerNames;
	}
	public void setShouldRecover(boolean shouldRecover)
	{
		this.shouldRecover = shouldRecover;
	}
	public void setVolatility(boolean volatility)
	{
		this.volatility = volatility;
	}
	public void setApplicationContext(ApplicationContext context) throws BeansException
	{
		applicationContext = context;
	}

	public void setArguments(Object[] arguments)
	{
		this.arguments = arguments;
	}
	public static class BeanInvokingJob implements Job
	{
		protected Log logger = LogFactory.getLog(getClass());
		public void execute(JobExecutionContext context) throws JobExecutionException
		{
			try
			{
				logger.debug("start");
				
				String targetBean = context.getMergedJobDataMap().getString("targetBean");
				logger.debug("targetBean is "+targetBean);
				if(targetBean==null)
					throw new JobExecutionException("targetBean cannot be null.", false);
				
				String targetMethod = context.getMergedJobDataMap().getString("targetMethod");
				logger.debug("targetMethod is "+targetMethod);
				if(targetMethod==null)
					throw new JobExecutionException("targetMethod cannot be null.", false);
				
				Object argumentsObject = context.getMergedJobDataMap().get("arguments");
				Object[] arguments = (argumentsObject instanceof String) ? null :
                                                              (Object[])argumentsObject;
				logger.debug("arguments array is "+arguments);
				
				Object bean = applicationContext.getBean(targetBean);
				logger.debug("applicationContext resolved bean name/id '"+targetBean+"' to "+bean);
				
				MethodInvoker beanMethod = new MethodInvoker();
				beanMethod.setTargetObject(bean);
				beanMethod.setTargetMethod(targetMethod);
				beanMethod.setArguments(arguments);
				beanMethod.prepare();
				logger.info("Invoking Bean: "+targetBean+"; Method: "+
                targetMethod+"; arguments: "+arguments+";");
				beanMethod.invoke();
			}
			catch(JobExecutionException e)
			{
				throw e;
			}
			catch(Exception e)
			{
				throw new JobExecutionException(e);
			}
			finally
			{
				logger.debug("end");
			}
		}
	}
	public static class StatefulBeanInvokingJob extends BeanInvokingJob implements StatefulJob
	{
		// No additional functionality; just needs to implement StatefulJob.
	}
}