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Quartz 之 Job参数 和 Job状态

韩善
2023-12-01

项目地址:  

         https://github.com/yuleiqq/quartz_example/tree/master/quartz_study

此示例旨在演示如何将运行时参数传递给quartz作业,以及如何维护作业中的状态。

程序将执行以下操作:

  • 启动Quartz调度器

  • 调度两个作业,每个作业将执行总共10秒一次

  • 调度程序将向第一个作业实例传递一个运行时作业参数“Green”

  • 调度程序将把运行时作业参数“Red”传递给第二个作业实例

  • 程序将等待60秒,以便两个作业有足够的时间运行

  • 关闭调度程序

本例中的代码由以下类组成:

JobStateExample :  主运行程序

ColorJob:一个简单的作业,打印一个最喜欢的颜色(作为运行时参数传入)并显示它的执行计数。

针对ColorJob,需要加如下两个注解,否则持久存储不会生效

@PersistJobDataAfterExecution
@DisallowConcurrentExecution
public class ColorJob implements Job {

话不多人,直接贴代码,看运行效果吧

ColorJob.java 

package com.example05;

import java.util.Date;

import org.quartz.DisallowConcurrentExecution;
import org.quartz.Job;
import org.quartz.JobDataMap;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.quartz.JobKey;
import org.quartz.PersistJobDataAfterExecution;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * <p>
 * This is just a simple job that receives parameters and
 * maintains state
 * </p>
 * 
 * @author Bill Kratzer
 */
@PersistJobDataAfterExecution
@DisallowConcurrentExecution
public class ColorJob implements Job {

    private static Logger _log = LoggerFactory.getLogger(ColorJob.class);
    
    // parameter names specific to this job
    public static final String FAVORITE_COLOR = "favorite color";
    public static final String EXECUTION_COUNT = "count";
    
    // Since Quartz will re-instantiate a class every time it
    // gets executed, members non-static member variables can
    // not be used to maintain state!
    private int _counter = 1;

    /**
     * <p>
     * Empty constructor for job initialization
     * </p>
     * <p>
     * Quartz requires a public empty constructor so that the
     * scheduler can instantiate the class whenever it needs.
     * </p>
     */
    public ColorJob() {
    }

    /**
     * <p>
     * Called by the <code>{@link org.quartz.Scheduler}</code> when a
     * <code>{@link org.quartz.Trigger}</code> fires that is associated with
     * the <code>Job</code>.
     * </p>
     * 
     * @throws JobExecutionException
     *             if there is an exception while executing the job.
     */
    public void execute(JobExecutionContext context)
        throws JobExecutionException {

        // This job simply prints out its job name and the
        // date and time that it is running
        JobKey jobKey = context.getJobDetail().getKey();
        
        // Grab and print passed parameters
        JobDataMap data = context.getJobDetail().getJobDataMap();
        String favoriteColor = data.getString(FAVORITE_COLOR);
        int count = data.getInt(EXECUTION_COUNT);
        _log.info("ColorJob: " + jobKey + " executing at " + new Date() + "\n" +
            "  favorite color is " + favoriteColor + "\n" + 
            "  execution count (from job map) is " + count + "\n" + 
            "  execution count (from job member variable) is " + _counter);
        
        // increment the count and store it back into the 
        // job map so that job state can be properly maintained
        count++;
        data.put(EXECUTION_COUNT, count);
        
        // Increment the local member variable 
        // This serves no real purpose since job state can not 
        // be maintained via member variables!
        _counter++;
    }

}
JobStateExample.java 
package com.example05;

import static org.quartz.DateBuilder.nextGivenSecondDate;
import static org.quartz.JobBuilder.newJob;
import static org.quartz.SimpleScheduleBuilder.simpleSchedule;
import static org.quartz.TriggerBuilder.newTrigger;

import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.SchedulerFactory;
import org.quartz.SchedulerMetaData;
import org.quartz.SimpleTrigger;
import org.quartz.impl.StdSchedulerFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Date;

/**
 * This Example will demonstrate how job parameters can be passed into jobs and how state can be maintained
 * 
 * @author Bill Kratzer
 */
public class JobStateExample {

  public void run() throws Exception {
    Logger log = LoggerFactory.getLogger(JobStateExample.class);

    log.info("------- Initializing -------------------");

    // First we must get a reference to a scheduler
    SchedulerFactory sf = new StdSchedulerFactory();
    Scheduler sched = sf.getScheduler();

    log.info("------- Initialization Complete --------");

    log.info("------- Scheduling Jobs ----------------");

    // get a "nice round" time a few seconds in the future....
    Date startTime = nextGivenSecondDate(null, 10);

    // job1 will only run 5 times (at start time, plus 4 repeats), every 10 seconds
    JobDetail job1 = newJob(ColorJob.class).withIdentity("job1", "group1").build();

    SimpleTrigger trigger1 = newTrigger().withIdentity("trigger1", "group1").startAt(startTime)
        .withSchedule(simpleSchedule().withIntervalInSeconds(10).withRepeatCount(4)).build();

    // pass initialization parameters into the job
    job1.getJobDataMap().put(ColorJob.FAVORITE_COLOR, "Green");
    job1.getJobDataMap().put(ColorJob.EXECUTION_COUNT, 1);

    // schedule the job to run
    Date scheduleTime1 = sched.scheduleJob(job1, trigger1);
    log.info(job1.getKey() + " will run at: " + scheduleTime1 + " and repeat: " + trigger1.getRepeatCount()
             + " times, every " + trigger1.getRepeatInterval() / 1000 + " seconds");

    // job2 will also run 5 times, every 10 seconds
    JobDetail job2 = newJob(ColorJob.class).withIdentity("job2", "group1").build();

    SimpleTrigger trigger2 = newTrigger().withIdentity("trigger2", "group1").startAt(startTime)
        .withSchedule(simpleSchedule().withIntervalInSeconds(10).withRepeatCount(4)).build();

    // pass initialization parameters into the job
    // this job has a different favorite color!
    job2.getJobDataMap().put(ColorJob.FAVORITE_COLOR, "Red");
    job2.getJobDataMap().put(ColorJob.EXECUTION_COUNT, 1);

    // schedule the job to run
    Date scheduleTime2 = sched.scheduleJob(job2, trigger2);
    log.info(job2.getKey().toString() + " will run at: " + scheduleTime2 + " and repeat: " + trigger2.getRepeatCount()
             + " times, every " + trigger2.getRepeatInterval() / 1000 + " seconds");

    log.info("------- Starting Scheduler ----------------");

    // All of the jobs have been added to the scheduler, but none of the jobs
    // will run until the scheduler has been started
    sched.start();

    log.info("------- Started Scheduler -----------------");

    log.info("------- Waiting 60 seconds... -------------");
    try {
      // wait five minutes to show jobs
      Thread.sleep(60L * 1000L);
      // executing...
    } catch (Exception e) {
      //
    }

    log.info("------- Shutting Down ---------------------");

    sched.shutdown(true);

    log.info("------- Shutdown Complete -----------------");

    SchedulerMetaData metaData = sched.getMetaData();
    log.info("Executed " + metaData.getNumberOfJobsExecuted() + " jobs.");

  }

  public static void main(String[] args) throws Exception {

    JobStateExample example = new JobStateExample();
    example.run();
  }

}

执行后,结果如下:

[INFO] 24 三月 06:12:08.584 下午 main [com.example05.JobStateExample]
------- Initializing -------------------

[INFO] 24 三月 06:12:08.662 下午 main [org.quartz.impl.StdSchedulerFactory]
Using default implementation for ThreadExecutor

[INFO] 24 三月 06:12:08.691 下午 main [org.quartz.core.SchedulerSignalerImpl]
Initialized Scheduler Signaller of type: class org.quartz.core.SchedulerSignalerImpl

[INFO] 24 三月 06:12:08.691 下午 main [org.quartz.core.QuartzScheduler]
Quartz Scheduler v.2.3.0 created.

[INFO] 24 三月 06:12:08.693 下午 main [org.quartz.simpl.RAMJobStore]
RAMJobStore initialized.

[INFO] 24 三月 06:12:08.694 下午 main [org.quartz.core.QuartzScheduler]
Scheduler meta-data: Quartz Scheduler (v2.3.0) 'MyScheduler' 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 20 threads.
  Using job-store 'org.quartz.simpl.RAMJobStore' - which does not support persistence. and is not clustered.


[INFO] 24 三月 06:12:08.695 下午 main [org.quartz.impl.StdSchedulerFactory]
Quartz scheduler 'MyScheduler' initialized from default resource file in Quartz package: 'quartz.properties'

[INFO] 24 三月 06:12:08.695 下午 main [org.quartz.impl.StdSchedulerFactory]
Quartz scheduler version: 2.3.0

[INFO] 24 三月 06:12:08.695 下午 main [com.example05.JobStateExample]
------- Initialization Complete --------

[INFO] 24 三月 06:12:08.695 下午 main [com.example05.JobStateExample]
------- Scheduling Jobs ----------------

[INFO] 24 三月 06:12:08.716 下午 main [com.example05.JobStateExample]
group1.job1 will run at: Tue Mar 24 18:12:10 CST 2020 and repeat: 4 times, every 10 seconds

[INFO] 24 三月 06:12:08.716 下午 main [com.example05.JobStateExample]
group1.job2 will run at: Tue Mar 24 18:12:10 CST 2020 and repeat: 4 times, every 10 seconds

[INFO] 24 三月 06:12:08.716 下午 main [com.example05.JobStateExample]
------- Starting Scheduler ----------------

[INFO] 24 三月 06:12:08.717 下午 main [org.quartz.core.QuartzScheduler]
Scheduler MyScheduler_$_NON_CLUSTERED started.

[INFO] 24 三月 06:12:08.717 下午 main [com.example05.JobStateExample]
------- Started Scheduler -----------------

[INFO] 24 三月 06:12:08.717 下午 main [com.example05.JobStateExample]
------- Waiting 60 seconds... -------------

[INFO] 24 三月 06:12:10.018 下午 MyScheduler_Worker-1 [com.example05.ColorJob]
ColorJob: group1.job1 executing at Tue Mar 24 18:12:10 CST 2020
  favorite color is Green
  execution count (from job map) is 1
  execution count (from job member variable) is 1

[INFO] 24 三月 06:12:10.020 下午 MyScheduler_Worker-2 [com.example05.ColorJob]
ColorJob: group1.job2 executing at Tue Mar 24 18:12:10 CST 2020
  favorite color is Red
  execution count (from job map) is 1
  execution count (from job member variable) is 1

[INFO] 24 三月 06:12:20.010 下午 MyScheduler_Worker-3 [com.example05.ColorJob]
ColorJob: group1.job1 executing at Tue Mar 24 18:12:20 CST 2020
  favorite color is Green
  execution count (from job map) is 2
  execution count (from job member variable) is 1

[INFO] 24 三月 06:12:20.010 下午 MyScheduler_Worker-4 [com.example05.ColorJob]
ColorJob: group1.job2 executing at Tue Mar 24 18:12:20 CST 2020
  favorite color is Red
  execution count (from job map) is 2
  execution count (from job member variable) is 1

[INFO] 24 三月 06:12:30.000 下午 MyScheduler_Worker-5 [com.example05.ColorJob]
ColorJob: group1.job1 executing at Tue Mar 24 18:12:30 CST 2020
  favorite color is Green
  execution count (from job map) is 3
  execution count (from job member variable) is 1

[INFO] 24 三月 06:12:30.000 下午 MyScheduler_Worker-6 [com.example05.ColorJob]
ColorJob: group1.job2 executing at Tue Mar 24 18:12:30 CST 2020
  favorite color is Red
  execution count (from job map) is 3
  execution count (from job member variable) is 1

[INFO] 24 三月 06:12:40.001 下午 MyScheduler_Worker-7 [com.example05.ColorJob]
ColorJob: group1.job1 executing at Tue Mar 24 18:12:40 CST 2020
  favorite color is Green
  execution count (from job map) is 4
  execution count (from job member variable) is 1

[INFO] 24 三月 06:12:40.002 下午 MyScheduler_Worker-8 [com.example05.ColorJob]
ColorJob: group1.job2 executing at Tue Mar 24 18:12:40 CST 2020
  favorite color is Red
  execution count (from job map) is 4
  execution count (from job member variable) is 1

[INFO] 24 三月 06:12:50.001 下午 MyScheduler_Worker-9 [com.example05.ColorJob]
ColorJob: group1.job1 executing at Tue Mar 24 18:12:50 CST 2020
  favorite color is Green
  execution count (from job map) is 5
  execution count (from job member variable) is 1

[INFO] 24 三月 06:12:50.002 下午 MyScheduler_Worker-10 [com.example05.ColorJob]
ColorJob: group1.job2 executing at Tue Mar 24 18:12:50 CST 2020
  favorite color is Red
  execution count (from job map) is 5
  execution count (from job member variable) is 1

[INFO] 24 三月 06:13:08.718 下午 main [com.example05.JobStateExample]
------- Shutting Down ---------------------

[INFO] 24 三月 06:13:08.718 下午 main [org.quartz.core.QuartzScheduler]
Scheduler MyScheduler_$_NON_CLUSTERED shutting down.

[INFO] 24 三月 06:13:08.718 下午 main [org.quartz.core.QuartzScheduler]
Scheduler MyScheduler_$_NON_CLUSTERED paused.

[INFO] 24 三月 06:13:09.104 下午 main [org.quartz.core.QuartzScheduler]
Scheduler MyScheduler_$_NON_CLUSTERED shutdown complete.

[INFO] 24 三月 06:13:09.104 下午 main [com.example05.JobStateExample]
------- Shutdown Complete -----------------

[INFO] 24 三月 06:13:09.104 下午 main [com.example05.JobStateExample]
Executed 10 jobs.

由结果可以看出,存储在JobDataMap 中的count 状态每次递增加1,成员变量的 _counter 没有变化,因为job 每次执行都会重新创建一个Job类.

 

 

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