How to schedule task in java code

Question

I know how to schedule task in spring context:

Answer 1

Unlike XML configuration or annotation configuration (where you can specify directly a method of a Spring managed bean), you need to create your own Runnable which will call your method.

Say you have the following managed bean:

@Component
public class SchedulingBean{
    public void doSomethingPeriodically(){
    }
}

and you want to run the method inside on a dynamic cron, you have (at least) three options:

Let SchedulingBean implement Runnable and call the doSomehtingPeriodically method from the run method

@Component
public class SchedulingBean implements Runnable{
    public void doSomethingPeriodically(){
}
@Override
public void run(){
    doSomethingPeriodically();
    }
}

Create a new (maybe anonymous) Runnable instance that calls the method from within the managed bean. This could be a little trickier, as you will need to get the reference to that bean from the Spring context.

Or create a new (maybe anonymous) Runnable instance that implements directly the needed functionality, without using a managed bean:

public class SchedulingBean implements Runnable{
    public void doSomethingPeriodically(){
    }
    @Override
    public void run(){
        doSomethingPeriodically();
    }
}

(note the missing @Component)

Answer 2

Just three paragraph above in your link

public interface TaskScheduler {

    ScheduledFuture schedule(Runnable task, Trigger trigger);

    ScheduledFuture schedule(Runnable task, Date startTime);

    ScheduledFuture scheduleAtFixedRate(Runnable task, Date startTime, long period);

    ScheduledFuture scheduleAtFixedRate(Runnable task, long period);

    ScheduledFuture scheduleWithFixedDelay(Runnable task, Date startTime, long delay);

    ScheduledFuture scheduleWithFixedDelay(Runnable task, long delay);

}

so in scheduler.schedule(task, new CronTrigger("* 15 9-17 * * MON-FRI"));

• scheduler is an instance of TaskScheduler

• task is a Runnable

  Runnable exampleRunnable = new Runnable(){
  
      @Override
      public void run() {
          //To change body of implemented methods 
      }
  };