Dynamic delay value with repeatWhen()

Question

Right now I\'m implementing some polling logic with RxJava. I\'m supposed to poll an endpoint a number of times until it tells me to stop. Additionally, each response come

Answer 1

As @JohnWowUs mentioned, you need out-of-band communication, but if you subscribe to the sequence more than once, you can use defer to have per-subscriber state:

Observable.defer(() -> {
    int[] pollDelay = { 0 };
    return service.pollEndpoint()
    .doOnNext(response -> pollDelay[0] = response.getDelay())
    .repeatWhen(o -> o.flatMap(v -> Observable.timer(pollDelay[0], MILLISECONDS)))
    .takeUntil(Blah::shouldStopPolling);
});