First Quartz Scheduling Application

There are two fundamental units in Quartz scheduling.

1.   Job

2.   Trigger

A job is an executable task that can be scheduled. A trigger provides a schedule for the job.

It is a two-step process to develop an application using Quartz scheduling package.

Step 1:  Create a Quartz job.

Quartz job can be created by implementing the org.quartz.job interface.

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

public class HelloWorld implements Job{
    public void execute(JobExecutionContext jec) throws JobExecutionException {
        System.out.println("Hello World");
    }
}

Step 2: Schedule the job

import java.util.Date;
import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.quartz.SchedulerFactory;
import org.quartz.SimpleTrigger;
import org.quartz.impl.JobDetailImpl;
import org.quartz.impl.StdSchedulerFactory;
import org.quartz.impl.triggers.SimpleTriggerImpl;

public class QuartzSchedulerEx {
    public static void main(String args[]) throws SchedulerException{

        // Initiate a Schedule Factory
        SchedulerFactory schedulerFactory = new StdSchedulerFactory();
        // Retrieve a scheduler from schedule factory
        Scheduler scheduler = schedulerFactory.getScheduler();

        //Creating JobDetailImpl and link to our Job class
  JobDetailImpl jobDetail = new JobDetailImpl();
  jobDetail.setName("First Job");
  jobDetail.setJobClass(HelloWorld.class);

        //Creating schedule time with trigger
  SimpleTriggerImpl simpleTrigger = new SimpleTriggerImpl();
  simpleTrigger.setStartTime(new Date(System.currentTimeMillis() + 1000));
  simpleTrigger.setRepeatCount(SimpleTrigger.REPEAT_INDEFINITELY);
  simpleTrigger.setRepeatInterval(3000);
  simpleTrigger.setName("FirstTrigger");

  //Start scheduler
  scheduler.start();
  scheduler.scheduleJob(jobDetail,simpleTrigger);

    }
}

Comments in the program are self-explanatory. When you run above program "Hello World" message is printed for every 3 seconds.

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