Quartz Schedular plugin for Java

In some kind of situation we may need to 

• Execute a program continuesly in a schedule time
• Execute a program in prefer time 

To do this kind of facility we normally use Thread   and  Synchronization concept .

But some additional plugin like Quartz offering us to implement this facility in very easy manner

Quartz

    Quartz normally additional plugin to java, which is used to schedule a task.And this provides to implement the custom time configuration at which time the user program needs to execute.

I used this plugin which is very working like charm .

Configuration :

 Step 1:  Download the latest jar file from Quartz official site , and configure it to your application libraries

Step 2: Two types of Scheduler is available in Quartz

•     SimpleTrigger
•     CronTrigger  

Simple trigger is used to define After how much time the program needs to execute
CronTrigger  is used to define At which time the program need to execute, it is very reliable one to know about this more here

We will use SimpleTrigger here

1.  Create SimpleTriggerExample  Java class

   import java.util.Date;
   import org.quartz.JobDetail; 
   import org.quartz.Scheduler;
   import org.quartz.SimpleTrigger;
   import org.quartz.impl.StdSchedulerFactory;
 
   public class SimpleTriggerExample 
   {
     public static void main( String[] args ) throws Exception
     {
        JobDetail job = new JobDetail();
     job.setName("dummyJobName");
     job.setJobClass(HelloJob.class);
 
     //configure the scheduler time
     SimpleTrigger trigger = new SimpleTrigger();
     trigger.setStartTime(new Date(System.currentTimeMillis() + 1000));
     trigger.setRepeatCount(SimpleTrigger.REPEAT_INDEFINITELY);
     trigger.setRepeatInterval(30000);
 
     //schedule it
     Scheduler scheduler = new StdSchedulerFactory().getScheduler();
     scheduler.start();
     scheduler.scheduleJob(job, trigger);
 
    }
  }

  2.Create HelloJob    class

     import org.quartz.Job;
    import org.quartz.JobExecutionContext;
    import org.quartz.JobExecutionException;
 
    public class HelloJob implements Job
    {
 public void execute(JobExecutionContext context)
 throws JobExecutionException

       {
   System.out.println("Hello Quartz!"); 
  }
    } 

 Run the SimpleTriggerExample file the Hello Quartz will be printed for every 30 seconds

Reference : www.Mkyong.com