package com.github.benjchristensen.gist;
import rx.Observable;
import rx.Subscriber;
import rx.schedulers.Schedulers;
/**
* Handling a hot Observable producing faster than the Subscriber with onBackpressureDrop
*
* This demonstrates how to use onBackpressureDrop when a hot stream doesn't itself handle "reactive pull"
*/
public class ReactivePullHotOnBackpressureDrop {
public static void main(String[] args) {
hotStream().onBackpressureDrop() // without this it will receive a MissingBackpressureException
.observeOn(Schedulers.computation())
.map(ReactivePullHotOnBackpressureDrop::doExpensiveWork)
.toBlocking().forEach(System.out::println);
}
/**
* Simulate a "slow consumer" doing expensive work, slowing that the producer is emitting.
*/
public static int doExpensiveWork(int i) {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
// do nothing
}
return i;
}
/**
* This is an artificial source to demonstrate an infinite stream that emits randomly
*/
/**
* This is an artificial source to demonstrate an infinite stream that emits randomly
*/
public static Observable<Integer> hotStream() {
return Observable.create((Subscriber<? super Integer> s) -> {
int i = 0;
while (!s.isUnsubscribed()) {
s.onNext(i++);
try {
// sleep for a random amount of time
// NOTE: Only using Thread.sleep here as an artificial demo.
Thread.sleep((long) (Math.random() * 10));
} catch (Exception e) {
// do nothing
}
}
}).subscribeOn(Schedulers.newThread());
}
}