Quartz实现固定执行次数

Quartz实现固定执行次数
虽然上一讲中说明,在实际应用中很少用到Quartz实现固定执行次数，但是我就是那个钻牛角尖的人.废话不多，代码如下:

实现思路:
1. 在上一讲中说明Quartz的JobDetail可以是无状态的，也可以是有状态的。Trigger无状态的，所以只能使用JobDetail有状态的子接口StatefulJob.Job代码如下:

package test.quartz.spring;

import java.util.Date;

import org.quartz.Job;
import org.quartz.JobDataMap;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.quartz.StatefulJob;

public class TJob implements StatefulJob {

	/**
	 * 不用挣扎了，Quartz都是无状态的，他不知道执行了几次。
	 * 如果想要记录状态就需要持久化到数据库.
	 */
	public void execute(JobExecutionContext cntxt) throws JobExecutionException {
		 
		JobDataMap jobDataMap = cntxt.getJobDetail().getJobDataMap();
		Integer count = (Integer) jobDataMap.get("count");
		if(count==null){
			count=0;
		}
		count++;
		 System.out.println("杨春龙,太帅了");
		 System.out.println("不是我说的");
		 System.out.println( " Generating report -  "
	            +  count
	            +  "-"
	            +   new  Date());
		 jobDataMap.put("count", count);
		 cntxt.getJobDetail().setJobDataMap(jobDataMap);
		 

	}

}

根据ApI描述，如果是有状态的Job，所有的Job都共享jobDataMap,所有把执行次数记录下来.虽然我记录了执行次数，但是因为Job是一个Thread，由ThreadPool来维持,那么如何监视Job的执行情况，在看源码中，发现有一个Listener，可以监听进程的执行，代码如下:

package test.quartz.spring;

import org.quartz.CronTrigger;
import org.quartz.JobExecutionContext;
import org.quartz.SchedulerException;
import org.quartz.Trigger;
import org.quartz.listeners.TriggerListenerSupport;

public class TriggerListener extends TriggerListenerSupport {
	
	private String name;  
	
	private Integer count; 
	public void setName(String name)   
    {   
        this.name=name;   
    }   
	
	public String getName() {
		// TODO Auto-generated method stub
		return this.name;
	}
	

	public Integer getCount() {
		return count;
	}

	public void setCount(Integer count) {
		this.count = count;
	}

	@Override
	public void triggerComplete(Trigger trigger, JobExecutionContext context,
			int triggerInstructionCode) {
		System.out.println("Trigger :"+trigger.getGroup()+"."+trigger.getName()+" completed with code:"+triggerInstructionCode);
		Integer current = (Integer) context.getJobDetail().getJobDataMap().get("count");
		System.out.println("调用次数:"+current);  
		if(current == count){
			try {
				context.getScheduler().shutdown();
			} catch (SchedulerException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		super.triggerComplete(trigger, context, triggerInstructionCode);
	}

	

}

在Job的执行中设置执行次数，在监听器中得到执行次数，当执行次数到达count的时候退出执行.
JobQuartz.xml配置如下

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">

<beans>
<!--要调度的对象-->

    <bean id="job" class="test.quartz.spring.TJob"></bean>
    <bean id="triggerListener" class="test.quartz.spring.TriggerListener">
    	<property name="name">
    		<value>triggerListener</value>
    	</property>
    	<property name="count">
    		<value>3</value>
    	</property> 
    </bean>
<!-- 定义目标bean和bean中的方法 -->
    <bean id="jobtask" class="org.springframework.scheduling.quartz.JobDetailBean">
    	<property name="jobClass">
    		<value>test.quartz.spring.TJob</value>
   		</property>

    </bean>
<!-- 定义触发的时间 -->
    <bean id = "cron" class = "org.springframework.scheduling.quartz.CronTriggerBean">
    	<!-- jobDetail中的name,group都已经设置 -->
        <property name="jobDetail">
            <ref bean="jobtask"/>
        </property>
        <property name="triggerListenerNames">  
	        <list>  
	           <value>triggerListener</value>  
	        </list>  
    	</property>   
        <property name="cronExpression">
            <value>0/10 * * * * ?</value>
        </property> 
    </bean>
<!-- 总管理 -->
    <bean autowire = "no" class = "org.springframework.scheduling.quartz.SchedulerFactoryBean">
        <property name="triggers">
            <list>
                <ref local ="cron"/>
            </list>
        </property>
        <!-- 添加监听器 -->
        <property name="triggerListeners">  
            <list>  
                <ref bean="triggerListener"/> 
            </list>  
        </property>  
        
    </bean>

</beans>

在SchedulerFactoryBean中配置监听器列表，在CronTriggerBean配置监听器名称，这样这个监听器就可以监听这个Trigger了，当执行了3次后自动退出
测试代码如下:

package test.quartz.spring;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestSpring {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		System.out.println("测试开始");
        ApplicationContext ctx = new ClassPathXmlApplicationContext("JobQuartz.xml");
        System.out.println("测试结束");

	}

}

测试输出如下:
测试开始

2010-09-27 09:33:39,640 INFO [org.springframework.context.support.ClassPathXmlApplicationContext] - <Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@3e86d0: display name [org.springframework.context.support.ClassPathXmlApplicationContext@3e86d0]; startup date [Mon Sep 27 09:33:39 CST 2010]; root of context hierarchy>
2010-09-27 09:33:39,718 INFO [org.springframework.beans.factory.xml.XmlBeanDefinitionReader] - <Loading XML bean definitions from class path resource [JobQuartz.xml]>
2010-09-27 09:33:39,781 INFO [org.springframework.context.support.ClassPathXmlApplicationContext] - <Bean factory for application context [org.springframework.context.support.ClassPathXmlApplicationContext@3e86d0]: org.springframework.beans.factory.support.DefaultListableBeanFactory@197a37c>
2010-09-27 09:33:39,812 INFO [org.springframework.beans.factory.support.DefaultListableBeanFactory] - <Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@197a37c: defining beans [job,triggerListener,jobtask,cron,org.springframework.scheduling.quartz.SchedulerFactoryBean#0]; root of factory hierarchy>
2010-09-27 09:33:39,953 INFO [org.quartz.core.SchedulerSignalerImpl] - <Initialized Scheduler Signaller of type: class org.quartz.core.SchedulerSignalerImpl>
2010-09-27 09:33:39,953 INFO [org.quartz.core.QuartzScheduler] - <Quartz Scheduler v.1.8.3 created.>
2010-09-27 09:33:39,953 INFO [org.quartz.simpl.RAMJobStore] - <RAMJobStore initialized.>
2010-09-27 09:33:39,953 INFO [org.quartz.core.QuartzScheduler] - <Scheduler meta-data: Quartz Scheduler (v1.8.3) 'org.springframework.scheduling.quartz.SchedulerFactoryBean#0' with instanceId 'NON_CLUSTERED'
  Scheduler class: 'org.quartz.core.QuartzScheduler' - running locally.
  NOT STARTED.
  Currently in standby mode.
  Number of jobs executed: 0
  Using thread pool 'org.quartz.simpl.SimpleThreadPool' - with 10 threads.
  Using job-store 'org.quartz.simpl.RAMJobStore' - which does not support persistence. and is not clustered.
>
2010-09-27 09:33:39,953 INFO [org.quartz.impl.StdSchedulerFactory] - <Quartz scheduler 'org.springframework.scheduling.quartz.SchedulerFactoryBean#0' initialized from an externally provided properties instance.>
2010-09-27 09:33:39,953 INFO [org.quartz.impl.StdSchedulerFactory] - <Quartz scheduler version: 1.8.3>
2010-09-27 09:33:39,953 INFO [org.quartz.core.QuartzScheduler] - <JobFactory set to: org.springframework.scheduling.quartz.AdaptableJobFactory@1b09468>
2010-09-27 09:33:39,953 INFO [org.springframework.scheduling.quartz.SchedulerFactoryBean] - <Starting Quartz Scheduler now>
2010-09-27 09:33:39,953 INFO [org.quartz.core.QuartzScheduler] - <Scheduler org.springframework.scheduling.quartz.SchedulerFactoryBean#0_$_NON_CLUSTERED started.>
测试结束
杨春龙,太帅了
不是我说的
 Generating report -  1-Mon Sep 27 09:33:40 CST 2010
Trigger :DEFAULT.cron completed with code:0
调用次数:1
杨春龙,太帅了
不是我说的
 Generating report -  2-Mon Sep 27 09:33:50 CST 2010
Trigger :DEFAULT.cron completed with code:0
调用次数:2
杨春龙,太帅了
不是我说的
 Generating report -  3-Mon Sep 27 09:34:00 CST 2010
Trigger :DEFAULT.cron completed with code:0
调用次数:3
2010-09-27 09:34:00,000 INFO [org.quartz.core.QuartzScheduler] - <Scheduler org.springframework.scheduling.quartz.SchedulerFactoryBean#0_$_NON_CLUSTERED shutting down.>
2010-09-27 09:34:00,000 INFO [org.quartz.core.QuartzScheduler] - <Scheduler org.springframework.scheduling.quartz.SchedulerFactoryBean#0_$_NON_CLUSTERED paused.>
2010-09-27 09:34:00,000 INFO [org.quartz.core.QuartzScheduler] - <Scheduler org.springframework.scheduling.quartz.SchedulerFactoryBean#0_$_NON_CLUSTERED shutdown complete.>

评论

1 楼 chxiaowu 2016-10-08  

nice！