示例12 - 使用RMI的远程作业调度

说明

此示例演示使用远程方法调用，Quartz调度器可以由客户端远程调度。

SimpleJob.java源码

package org.quartz.examples.example12;

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

/**
 * Job的一个缺陷实现，用于单元测试
 * 作者：James House
 */
public class SimpleJob implements Job {

    public static final String MESSAGE = "msg";

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

    /**
     * Quartz需要一个公共的空参构造函数，以便调度器可以在需要时实例化类
     */
    public SimpleJob() {
    }

    /**
     * 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();

        String message = (String) context.getJobDetail().getJobDataMap().get(MESSAGE);

        _log.info("SimpleJob: " + jobKey + " executing at " + new Date());
        _log.info("SimpleJob: msg: " + message);
    }

    

}

RemoteServerExample.java源码

package org.quartz.examples.example12;

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

/**
 * 作者：Bill Kratzer
 */
public class RemoteServerExample {

  /**
   * 此示例将产生大量要执行的作业
   * 作者：James House, Bill Kratzer
   */
  public void run() throws Exception {
    Logger log = LoggerFactory.getLogger(RemoteServerExample.class);

    //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("------- (Not Scheduling any Jobs - relying on a remote client to schedule jobs --");

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

    //开启调度器
    sched.start();

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

    log.info("------- Waiting ten minutes... ------------");

    //等待5分钟让我们的作业有机会执行
    try {
      Thread.sleep(600L * 1000L);
    } 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 {

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

}

RemoteClientExample.java源码

package org.quartz.examples.example12;

import static org.quartz.CronScheduleBuilder.cronSchedule;
import static org.quartz.JobBuilder.newJob;
import static org.quartz.TriggerBuilder.newTrigger;
import org.quartz.JobDataMap;
import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.SchedulerFactory;
import org.quartz.Trigger;
import org.quartz.impl.StdSchedulerFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 此示例是一个客户端程序，它将远程与调度器进行通信以调度作业。在本例中，我们需要使用JDBC作业存储。
 * 客户端将远程连接到JDBC作业存储以调度作业。
 * 作者：James House, Bill Kratzer
 */
public class RemoteClientExample {

    public void run() throws Exception {

        Logger log = LoggerFactory.getLogger(RemoteClientExample.class);

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

        //定义作业并要求其执行
        JobDetail job = newJob(SimpleJob.class)
            .withIdentity("remotelyAddedJob", "default")
            .build();
        
        JobDataMap map = job.getJobDataMap();
        map.put("msg", "Your remotely added job has executed!");
        
        Trigger trigger = newTrigger()
            .withIdentity("remotelyAddedTrigger", "default")
            .forJob(job.getKey())
            .withSchedule(cronSchedule("/5 * * ? * *"))
            .build();

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

        log.info("Remote job scheduled.");
    }

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

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

}

控制台输出（RemoteServerExample）

[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.example12.RemoteServerExample - ------- Initialization Complete -----------
[main] INFO org.quartz.examples.example12.RemoteServerExample - ------- (Not Scheduling any Jobs - relying on a remote client to schedule jobs --
[main] INFO org.quartz.examples.example12.RemoteServerExample - ------- Starting Scheduler ----------------
[main] INFO org.quartz.core.QuartzScheduler - Scheduler DefaultQuartzScheduler_$_NON_CLUSTERED started.
[main] INFO org.quartz.examples.example12.RemoteServerExample - ------- Started Scheduler -----------------
[main] INFO org.quartz.examples.example12.RemoteServerExample - ------- Waiting ten minutes... ------------

控制台输出（RemoteClientExample）

[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.example12.RemoteClientExample - Remote job scheduled.