@Scheduled and Spring webflux

Question

I'm searching a way to use scheduled tasks in a reactive API. I know that it uses the thread pool so it's not very compatible with the webflux components.

Do you have an equivalent to do the job?

Answer 1

You may try to use Schedulers.immediate() inside @Scheduled method:

doWork()
  .subscribeOn(Schedulers.immediate())
  .subscribe()

As a consequence tasks run on the thread that submitted them.

Answer 2

There are several ways to do. Considering how you want to schedule it you can use following as well.

@Configuration
class ApplicationConfiguration() {

    @PostConstruct
    fun init() {

        Flux.interval(Duration.ofMinutes(12))
            .onBackpressureDrop()
            .flatMap { /* some task that return Mono<T> */ }
            .subscribeOn(Schedulers.boundedElastic())
            .subscribe()
    }
}

Please note subscribeOn(Schedulers.boundedElastic()) is not required unless the call is blocking. Also I am using onBackpressureDrop but your requirements may be different than that.

Answer 3

Webflux has it's own scheduler, and I gues this way should do it:

Disposable schedulePeriodically(Runnable task, long initialDelay, long period, TimeUnit unit);