Quartz: Trigger keys

Quartz uses trigger keys to uniquely identify triggers. A trigger key composed of two components.

a.   Name

b.   Group

Name of the trigger must be unique in a group. Trigger key is formed by groupName followed by . followed by name.

TriggerKey class is defined like below.

Example

SimpleTriggerImpl trigger1 = new SimpleTriggerImpl();

trigger1.setKey(new TriggerKey("printJobTrigger", "printMsgsGroup"));

Trigger key for above example is ‘printMsgsGroup.printJobTrigger’.

If you do not specify the group, then the default group name is 'DEFAULT'.

Find the below working example.

HelloJob.java

package com.sample.jobs;

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

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

PrintJob.java

package com.sample.jobs;

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

/**
 * Job prints 'Hello World' message to console.
 * 
 * @author Krishna
 *
 */
public class PrintJob implements Job {
 public void execute(JobExecutionContext jec) throws JobExecutionException {
  System.out.println("Printing.....");
 }
}

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.TriggerKey;
import org.quartz.impl.JobDetailImpl;
import org.quartz.impl.StdSchedulerFactory;
import org.quartz.impl.triggers.SimpleTriggerImpl;

import com.sample.jobs.HelloJob;
import com.sample.jobs.PrintJob;

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 printJobDetails = new JobDetailImpl();
  printJobDetails.setName("First Job");
  printJobDetails.setJobClass(PrintJob.class);

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

  // Creating schedule time with trigger
  SimpleTriggerImpl trigger1 = new SimpleTriggerImpl();
  trigger1.setStartTime(new Date(System.currentTimeMillis() + 1000));
  trigger1.setRepeatCount(2);
  trigger1.setRepeatInterval(1000);
  trigger1.setName("First Trigger");
  trigger1.setPriority(10); // Seting trigger 1 priority to 10
  trigger1.setKey(new TriggerKey("printJobTrigger", "printMsgsGroup"));

  SimpleTriggerImpl trigger2 = new SimpleTriggerImpl();
  trigger2.setStartTime(new Date(System.currentTimeMillis() + 1000));
  trigger2.setRepeatCount(2);
  trigger2.setRepeatInterval(1000);
  trigger2.setName("Second Trigger");
  trigger2.setKey(new TriggerKey("helloJobTrigger", "printMsgsGroup"));

  // Start scheduler
  scheduler.start();

  // Schedule the jobs using triggers
  scheduler.scheduleJob(printJobDetails, trigger1);
  scheduler.scheduleJob(helloJobDetails, trigger2);

  System.out.println("Trigger 1 key : " + trigger1.getKey());
  System.out.println("Trigger 2 key : " + trigger2.getKey());

 }
}

Output

Trigger 1 key : printMsgsGroup.printJobTrigger

Trigger 2 key : printMsgsGroup.helloJobTrigger

Printing.....

Hello!!!

Printing.....

Hello!!!

Printing.....

Hello!!!

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