springspring-annotationsspring-scheduled

Spring @Scheduled annotation random delay

I am using the @Scheduled annotation from Spring framework to invoke a method. But I have multiple nodes in my setup and I do not want them to all run at exactly the same time. So I'd like to set a random value to the initial delay to offset them from each other.

import org.springframework.scheduling.annotation.Scheduled;

@Scheduled(fixedRate = 600000, initialDelay = <random number between 0 and 10 minutes> )

Unfortunately, I am only allowed to use a constant expression here. Is there any other way around this? I thought of using Spring expression language.

Solution

  • You can configure the initialDelay through Spring Expression Language:

    @Scheduled(fixedRate = 600000, initialDelayString = "#{ T(java.util.concurrent.ThreadLocalRandom).current().nextInt(10*60*1000) }" )

    I don't have an IDE to test that code right now, so you may need to adapt that a bit.