Multiple triggers/Cron expression in a single Quartz Job

Question

I have list of templates and each has different set of parameters , and each template has to execute at specific time.How do i approach this problem in Quartz scheduler

 Template  Parameters list                 Time of execution
 T1        ['date','frequency']            3:30 AM
 T2        ['Id']                          10:20 AM
 T3        ['customerid','houseNo','Info'] 6:06 PM

and execute() method will perform some operation on parameter list for each template.I want to do this in a single Quartz job. I was trying something like this :

  def list = ["*/2 * * * * ?","*/10 * * * * ?","*/20 * * * * ?"]
  String triggerName;
  int j=0;
  for(cronExpr in list)
  {
        j++;
        triggerName="trigger"+Integer.toString(j)
        triggerName = new CronTrigger();
        triggerName.setName(triggerName);
        triggerName.setGroup(job.getGroup());
        triggerName.setJobName(job.getName());
        triggerName.setJobGroup(job.getGroup());
        triggerName.setCronExpression(cronExpr);
  }

I have asked similar question before without any satisfactory answer ,it would be very helpful if someone can provide a better way to approach this problem along with some guide or useful link on quartz scheduling which can walk me through basic and advanced topics so that i have better understanding on how to use multiple triggers or some way to approach the above problem.

Jan Moravec Jan Moravec · Accepted Answer · 2015-01-08T09:50:35

What I would probably do in your case is that I would create multiple triggers for a single job that implements the required business logic that is common to all your templates.

Each trigger would have the template parameters specified in its JobDataMap that you can associated with a trigger. Once your job gets triggered and its execute method is invoked you can use the following code to access the relevant template parameters:

context.getMergedJobDataMap()

See the getMergedJobDataMap JavaDoc for details.

Example in Java:

    public class TemplateJob implements Job {

      public void execute(JobExecutionContext context)
        throws JobExecutionException
      {
        JobDataMap dataMap = context.getMergedJobDataMap();

        String templateId = dataMap.getString("templateId");

        if ("T1".equals(templateId))
        {
          // template1 params
          String t1Date = dataMap.getString("date");
          String t1Frequency = dataMap.getString("frequency");

          doTemplate1Logic(t1Date, t1Frequency);
        }
        else if ("T2".equals(templateId))
        {    
          // template2 params
          String t2Id = dataMap.get("Id");

          doTemplate2Logic(t1Id);
        }    
        else if ("T3".equals(templateId))
        {    
          // template3 params
          String t3CustomerId = dataMap.get("customerid");
          String t3HouseNo = dataMap.get("houseNo");
          String t3Info = dataMap.get("Info");

          doTemplate3Logic(t1Id);
        }
        else
        {
          throw new JobExecutionException("Unrecognized template ID: " + templateId);
        }
      }

      ...
    }


    public class TestCase
    {
      public static void main(String[] args)
      {
        Scheduler scheduler = ....

        JobDetail templateJob = JobBuilder.newJob(TemplateJob.class)
          .withIdentity("templateJob", "myJobGroup")
          .build();          

        // trigger for Temlate1
        Trigger template1Trigger = TriggerBuilder.newTrigger()
          .withIdentity("template1Trigger", "myTriggerGroup")
          .withSchedule(TriggerBuilder.cronSchedule("*/2 * * * * ?"))
          .usingJobData("date", "...")
          .usingJobData("frequency", "...")
          .forJob("templateJob", "myJobGroup")
          .build();      
        scheduler.scheduleJob(templateJob, template1Trigger);

        // trigger for Temlate2
        Trigger template2Trigger = TriggerBuilder.newTrigger()
        ...
        scheduler.scheduleJob(templateJob, template2Trigger);

        ...
      }
    }

If the template processing logic differs significantly for individual templates, you should probably implement a separate job for each of your templates.

Multiple triggers/Cron expression in a single Quartz Job

1 Answers