示例9 - 作业监听器

说明

此示例演示如何使用作业监听器使一个作业触发另一个作业，从而构建一个简单的工作流。

SimpleJob1.java源码

package org.quartz.examples.example9;

import java.util.Date;
import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.quartz.JobKey;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 这只是被例1执行过许多次的简单作业（只改了一下输出信息）
 * 作者：Bill Kratzer
 */
public class SimpleJob1 implements Job {

    private static Logger _log = LoggerFactory.getLogger(SimpleJob1.class);

    /**
     * 作业初始化的空参构造函数
     */
    public SimpleJob1() {
    }

    /**
     * 当与此作业相关联的触发器触发时，由调度器调用此方法
     * Throws：作业执行异常（JobExecutionException）-当执行作业时产生异常
     */
    public void execute(JobExecutionContext context)
        throws JobExecutionException {

        //此作业简单地输出它的名称及运行时间
        JobKey jobKey = context.getJobDetail().getKey();
        _log.info("SimpleJob1 says: " + jobKey + " executing at " + new Date());
    }

}

SimpleJob2.java源码

package org.quartz.examples.example9;

import java.util.Date;
import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.quartz.JobKey;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 这只是被例1执行过许多次的简单作业（只改了一下输出信息）
 * 作者：Bill Kratzer
 */
public class SimpleJob2 implements Job {

    private static Logger _log = LoggerFactory.getLogger(SimpleJob2.class);

    /**
     * 作业初始化的空参构造函数
     */
    public SimpleJob2() {
    }

    /**
     * 当与此作业相关联的触发器触发时，由调度器调用此方法
     * Throws：作业执行异常（JobExecutionException）-当执行作业时产生异常
     */
    public void execute(JobExecutionContext context)
        throws JobExecutionException {

        //该作业简单地输出它的名称及运行时间
        JobKey jobKey = context.getJobDetail().getKey();
        _log.info("SimpleJob2 says: " + jobKey + " executing at " + new Date());
    }

}

ListenerExample.java源码

package org.quartz.examples.example9;

import static org.quartz.JobBuilder.newJob;
import static org.quartz.TriggerBuilder.newTrigger;
import org.quartz.JobDetail;
import org.quartz.JobKey;
import org.quartz.JobListener;
import org.quartz.Matcher;
import org.quartz.Scheduler;
import org.quartz.SchedulerFactory;
import org.quartz.SchedulerMetaData;
import org.quartz.Trigger;
import org.quartz.impl.StdSchedulerFactory;
import org.quartz.impl.matchers.KeyMatcher;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 演示JobListeners的行为。特别是，本示例将使用作业监听器在一个作业成功执行后触发另一个作业。
 */
public class ListenerExample {

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

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

    //首先，我们必须获得对调度器的引用
    SchedulerFactory sf = new StdSchedulerFactory();
    Scheduler sched = sf.getScheduler();

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

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

    //安排作业立即执行

    JobDetail job = newJob(SimpleJob1.class).withIdentity("job1").build();

    Trigger trigger = newTrigger().withIdentity("trigger1").startNow().build();

    //设置监听器
    JobListener listener = new Job1Listener();
    Matcher<JobKey> matcher = KeyMatcher.keyEquals(job.getKey());
    sched.getListenerManager().addJobListener(listener, matcher);

    //安排作业执行
    sched.scheduleJob(job, trigger);

    //所有作业都已添加到调度器中，但在调度器启动之前，所有作业都不会执行
    log.info("------- Starting Scheduler ----------------");
    sched.start();

    //等待30秒
    //注意：不会执行任何作业
    log.info("------- Waiting 30 seconds... --------------");
    try {
      //等待30秒以显示作业
      Thread.sleep(30L * 1000L);
      //执行中…
    } catch (Exception e) {
      //
    }

    //关闭调度器
    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 {

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

}

Job1Listener.java源码

package org.quartz.examples.example9;

import static org.quartz.JobBuilder.newJob;
import static org.quartz.TriggerBuilder.newTrigger;
import org.quartz.JobDetail;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.quartz.JobListener;
import org.quartz.SchedulerException;
import org.quartz.Trigger;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 作者：wkratzer
 */
public class Job1Listener implements JobListener {

  private static Logger _log = LoggerFactory.getLogger(Job1Listener.class);

  public String getName() {
    return "job1_to_job2";
  }

  public void jobToBeExecuted(JobExecutionContext inContext) {
    _log.info("Job1Listener says: Job Is about to be executed.");
  }

  public void jobExecutionVetoed(JobExecutionContext inContext) {
    _log.info("Job1Listener says: Job Execution was vetoed.");
  }

  public void jobWasExecuted(JobExecutionContext inContext, JobExecutionException inException) {
    _log.info("Job1Listener says: Job was executed.");

    //简单作业#2
    JobDetail job2 = newJob(SimpleJob2.class).withIdentity("job2").build();

    Trigger trigger = newTrigger().withIdentity("job2Trigger").startNow().build();

    try {
      //安排作业运行！
      inContext.getScheduler().scheduleJob(job2, trigger);
    } catch (SchedulerException e) {
      _log.warn("Unable to schedule job2!");
      e.printStackTrace();
    }

  }

}

控制台输出

[main] INFO org.quartz.examples.example9.ListenerExample - ------- Initializing ----------------------
[main] INFO org.quartz.impl.StdSchedulerFactory - Using default implementation for ThreadExecutor
[main] INFO org.quartz.simpl.SimpleThreadPool - Job execution threads will use class loader of thread: main
[main] INFO org.quartz.core.SchedulerSignalerImpl - Initialized Scheduler Signaller of type: class org.quartz.core.SchedulerSignalerImpl
[main] INFO org.quartz.core.QuartzScheduler - Quartz Scheduler v.2.3.0 created.
[main] INFO org.quartz.simpl.RAMJobStore - RAMJobStore initialized.
[main] INFO org.quartz.core.QuartzScheduler - Scheduler meta-data: Quartz Scheduler (v2.3.0) 'DefaultQuartzScheduler' 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.

[main] INFO org.quartz.impl.StdSchedulerFactory - Quartz scheduler 'DefaultQuartzScheduler' initialized from default resource file in Quartz package: 'quartz.properties'
[main] INFO org.quartz.impl.StdSchedulerFactory - Quartz scheduler version: 2.3.0
[main] INFO org.quartz.examples.example9.ListenerExample - ------- Initialization Complete -----------
[main] INFO org.quartz.examples.example9.ListenerExample - ------- Scheduling Jobs -------------------
[main] INFO org.quartz.examples.example9.ListenerExample - ------- Starting Scheduler ----------------
[main] INFO org.quartz.core.QuartzScheduler - Scheduler DefaultQuartzScheduler_$_NON_CLUSTERED started.
[main] INFO org.quartz.examples.example9.ListenerExample - ------- Waiting 30 seconds... --------------
[DefaultQuartzScheduler_Worker-1] INFO org.quartz.examples.example9.Job1Listener - Job1Listener says: Job Is about to be executed.
[DefaultQuartzScheduler_Worker-1] INFO org.quartz.examples.example9.SimpleJob1 - SimpleJob1 says: DEFAULT.job1 executing at Thu Dec 01 22:20:49 CST 2022
[DefaultQuartzScheduler_Worker-1] INFO org.quartz.examples.example9.Job1Listener - Job1Listener says: Job was executed.
[DefaultQuartzScheduler_Worker-2] INFO org.quartz.examples.example9.SimpleJob2 - SimpleJob2 says: DEFAULT.job2 executing at Thu Dec 01 22:20:49 CST 2022
[main] INFO org.quartz.examples.example9.ListenerExample - ------- Shutting Down ---------------------
[main] INFO org.quartz.core.QuartzScheduler - Scheduler DefaultQuartzScheduler_$_NON_CLUSTERED shutting down.
[main] INFO org.quartz.core.QuartzScheduler - Scheduler DefaultQuartzScheduler_$_NON_CLUSTERED paused.
[main] INFO org.quartz.core.QuartzScheduler - Scheduler DefaultQuartzScheduler_$_NON_CLUSTERED shutdown complete.
[main] INFO org.quartz.examples.example9.ListenerExample - ------- Shutdown Complete -----------------
[main] INFO org.quartz.examples.example9.ListenerExample - Executed 2 jobs.

Process finished with exit code 0