Quartz: Scheduler: isStarted(): Check whether scheduler is started or not

‘org.quartz.Scheduler’ interface provides isStarted method, it return true if the scheduler is started, else false.

Find the below working application.

HelloJob.java

package com.sample.jobs;

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

public class HelloJob implements Job {
 public void execute(JobExecutionContext jec) throws JobExecutionException {
  String schedulerName = null;
  String schedulerInstanceId = null;

  String userName = null;
  String token = null;

  try {

   Scheduler scheduler = jec.getScheduler();

   schedulerName = scheduler.getSchedulerName();
   schedulerInstanceId = scheduler.getSchedulerInstanceId();

   userName = (String) scheduler.getContext().get("userName");
   token = (String) scheduler.getContext().get("token");

  } catch (SchedulerException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }

  System.out.println("**************************************************");
  System.out.println("Hello!!!");
  System.out.println("Job is triggered by scheduler : " + schedulerName);
  System.out.println("Scheduler instance id : " + schedulerInstanceId);
  System.out.println("User name : " + userName);
  System.out.println("Token : " + token);
  System.out.println("**************************************************");
 }
}

QuartzSchedulerEx.java

package com.sample.app;

import java.util.Date;

import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.quartz.SchedulerFactory;
import org.quartz.impl.JobDetailImpl;
import org.quartz.impl.StdSchedulerFactory;
import org.quartz.impl.triggers.SimpleTriggerImpl;

import com.sample.jobs.HelloJob;

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

  // Initiate a Schedule Factory
  SchedulerFactory schedulerFactory = new StdSchedulerFactory();

  // Retrieve a scheduler from schedule factory
  Scheduler scheduler = schedulerFactory.getScheduler();

  scheduler.getContext().put("userName", "Krishna");
  scheduler.getContext().put("token", "token1234");

  // Delay the execution of scheduler for 5 seconds
  scheduler.startDelayed(5);

  JobDetailImpl helloJobDetails = new JobDetailImpl();
  helloJobDetails.setName("Hello Job");
  helloJobDetails.setJobClass(HelloJob.class);

  // Creating schedule time with trigger
  SimpleTriggerImpl trigger1 = new SimpleTriggerImpl();
  trigger1.setStartTime(new Date(System.currentTimeMillis() + 500));
  trigger1.setRepeatCount(-1);
  trigger1.setRepeatInterval(3000);
  trigger1.setName("First Trigger");
  trigger1.setPriority(10); // Setting trigger 1 priority to 10

  scheduler.scheduleJob(helloJobDetails, trigger1);

  Thread t1 = new Thread() {
   public void run() {

    try {
     while (!scheduler.isStarted()) {
      Thread.sleep(1000);
      System.out.println("Scheduler is not started");
     }
    } catch (Exception e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }

   }
  };
  
  t1.start();
 }
}

Output

Scheduler is not started

Scheduler is not started

Scheduler is not started

Scheduler is not started

**************************************************

Hello!!!

**************************************************

Hello!!!

Job is triggered by scheduler : DefaultQuartzScheduler

Scheduler instance id : NON_CLUSTERED

Job is triggered by scheduler : DefaultQuartzScheduler

Scheduler instance id : NON_CLUSTERED

User name : Krishna

User name : Krishna

Token : token1234

**************************************************

Token : token1234

**************************************************

Scheduler is not started

**************************************************

Hello!!!

Job is triggered by scheduler : DefaultQuartzScheduler

Scheduler instance id : NON_CLUSTERED

User name : Krishna

Token : token1234

**************************************************

.....

.....

.....

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