CODEWITHSUNDEEP
javaspringspring-bootscheduler
Deepa
Deepa

Reputation: 41

Spring boot scheduler to stop running if condition is satisfied and run next day again

I have a scheduler(using @Scheduler) running between 7 to 9 PM for every 15 mins. It looks for a file every 15 mins. If the file is found then the scheduler should stop for today and run next day again. How to achieve this in spring boot?

Upvotes: 1

Views: 2144

Answers (2)

Mark Bramnik
Mark Bramnik

Reputation: 42441

Probably the easiest way is to implement it at the level of business logic. Spring provides a way to run a periodic task, that's true, but it can't stop the job for some time if a business case is met (the file is found).

Having said that, you could implement the scheduled job as follows:

@Component
public class MyScheduledJob {
   private LocalDateTime runNextTime = null;
   private boolean isFileFound = false;

   @Scheduled(/**here comes your original cron expression: 7 am to 9 pm with an interval of 15 minutes as you say **/)
   public void runMe() {
     if(isFileFound && LocalDateTime.now().isBefore(runNextTime)) {
       // do not run a real job processing
       return;
     }

     isFileFound = checkWhetherFileExists();
     if(isFileFound) {
       runNextTime = calculateWhenDoYouWantToStartRunningTheActualJobProcessingNextTime();
     }
     
     ... do actual job processing... Its not clear from the question whether it should do something if the file is not found as well, but I'm sure you've got the point ...
       
   }
}

Since the bean is a singleton you can safely create a state for it, no-one won't change that state anyway.

Upvotes: 3

kameshsr
kameshsr

Reputation: 357

You can do something like this. You can write your logic for checking files inside this method.

@Scheduled(fixedDelay = 1000, initialDelay = 1000)
    public void scheduleFixedRateWithInitialDelayTask() {
     
        long now = System.currentTimeMillis() / 1000;
        System.out.println(
          "Fixed-rate task with one-second initial delay - " + now);
    }

See this for more details.

Upvotes: 0

Related Questions