@Test
@SuppressWarnings("unchecked")
public void testOrdering() throws InterruptedException {
Observable<String> obs = Observable.just("one", null, "two", "three", "four");
Observer<String> observer = mock(Observer.class);
InOrder inOrder = inOrder(observer);
TestSubscriber<String> ts = new TestSubscriber<String>(observer);
obs.observeOn(Schedulers.computation()).subscribe(ts);
ts.awaitTerminalEvent(1000, TimeUnit.MILLISECONDS);
if (ts.getOnErrorEvents().size() > 0) {
for (Throwable t : ts.getOnErrorEvents()) {
t.printStackTrace();
}
fail("failed with exception");
}
inOrder.verify(observer, times(1)).onNext("one");
inOrder.verify(observer, times(1)).onNext(null);
inOrder.verify(observer, times(1)).onNext("two");
inOrder.verify(observer, times(1)).onNext("three");
inOrder.verify(observer, times(1)).onNext("four");
inOrder.verify(observer, times(1)).onCompleted();
inOrder.verifyNoMoreInteractions();
}
/**
* Make sure we get a MissingBackpressureException propagated through when we have a fast temporal
* (hot) producer.
*/
@Test
public void testHotOperatorBackpressure() {
TestSubscriber<String> ts = new TestSubscriber<String>();
Observable.timer(0, 1, TimeUnit.MICROSECONDS)
.observeOn(Schedulers.computation())
.map(
new Func1<Long, String>() {
@Override
public String call(Long t1) {
System.out.println(t1);
try {
Thread.sleep(100);
} catch (InterruptedException e) {
}
return t1 + " slow value";
}
})
.subscribe(ts);
ts.awaitTerminalEvent();
System.out.println("Errors: " + ts.getOnErrorEvents());
assertEquals(1, ts.getOnErrorEvents().size());
assertEquals(MissingBackpressureException.class, ts.getOnErrorEvents().get(0).getClass());
}
@Test(timeout = 2000)
public void testFirehoseFailsAsExpected() {
AtomicInteger c = new AtomicInteger();
TestSubscriber<Integer> ts = new TestSubscriber<Integer>();
firehose(c).observeOn(Schedulers.computation()).map(SLOW_PASS_THRU).subscribe(ts);
ts.awaitTerminalEvent();
System.out.println(
"testFirehoseFailsAsExpected => Received: "
+ ts.getOnNextEvents().size()
+ " Emitted: "
+ c.get());
assertEquals(1, ts.getOnErrorEvents().size());
assertTrue(ts.getOnErrorEvents().get(0) instanceof MissingBackpressureException);
}
@Test
public void testErrorPropagatesWhenNoOutstandingRequests() {
Observable<Long> timer =
Observable.timer(0, 1, TimeUnit.MICROSECONDS)
.doOnEach(
new Action1<Notification<? super Long>>() {
@Override
public void call(Notification<? super Long> n) {
// System.out.println("BEFORE " +
// n);
}
})
.observeOn(Schedulers.newThread())
.doOnEach(
new Action1<Notification<? super Long>>() {
@Override
public void call(Notification<? super Long> n) {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
}
// System.out.println("AFTER " +
// n);
}
});
TestSubscriber<Long> ts = new TestSubscriber<Long>();
Observable.combineLatest(
timer,
Observable.<Integer>never(),
new Func2<Long, Integer, Long>() {
@Override
public Long call(Long t1, Integer t2) {
return t1;
}
})
.take(RxRingBuffer.SIZE * 2)
.subscribe(ts);
ts.awaitTerminalEvent();
assertEquals(1, ts.getOnErrorEvents().size());
assertEquals(MissingBackpressureException.class, ts.getOnErrorEvents().get(0).getClass());
}
@Test
public void testOnErrorCutsAheadOfOnNext() {
final PublishSubject<Long> subject = PublishSubject.create();
final AtomicLong counter = new AtomicLong();
TestSubscriber<Long> ts =
new TestSubscriber<Long>(
new Observer<Long>() {
@Override
public void onCompleted() {}
@Override
public void onError(Throwable e) {}
@Override
public void onNext(Long t) {
// simulate slow consumer to force backpressure failure
try {
Thread.sleep(1);
} catch (InterruptedException e) {
}
}
});
subject.observeOn(Schedulers.computation()).subscribe(ts);
// this will blow up with backpressure
while (counter.get() < 102400) {
subject.onNext(counter.get());
counter.incrementAndGet();
}
ts.awaitTerminalEvent();
assertEquals(1, ts.getOnErrorEvents().size());
assertTrue(ts.getOnErrorEvents().get(0) instanceof MissingBackpressureException);
// assert that the values are sequential, that cutting in didn't allow skipping some but
// emitting others.
// example [0, 1, 2] not [0, 1, 4]
assertTrue(
ts.getOnNextEvents().size()
== ts.getOnNextEvents().get(ts.getOnNextEvents().size() - 1) + 1);
// we should emit the error without emitting the full buffer size
assertTrue(ts.getOnNextEvents().size() < RxRingBuffer.SIZE);
}
@Test
public void testQueueFullEmitsError() {
final CountDownLatch latch = new CountDownLatch(1);
Observable<Integer> observable =
Observable.create(
new OnSubscribe<Integer>() {
@Override
public void call(Subscriber<? super Integer> o) {
for (int i = 0; i < RxRingBuffer.SIZE + 10; i++) {
o.onNext(i);
}
latch.countDown();
o.onCompleted();
}
});
TestSubscriber<Integer> testSubscriber =
new TestSubscriber<Integer>(
new Observer<Integer>() {
@Override
public void onCompleted() {}
@Override
public void onError(Throwable e) {}
@Override
public void onNext(Integer t) {
// force it to be slow and wait until we have queued everything
try {
latch.await(500, TimeUnit.MILLISECONDS);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
});
observable.observeOn(Schedulers.newThread()).subscribe(testSubscriber);
testSubscriber.awaitTerminalEvent();
List<Throwable> errors = testSubscriber.getOnErrorEvents();
assertEquals(1, errors.size());
System.out.println("Errors: " + errors);
Throwable t = errors.get(0);
if (t instanceof MissingBackpressureException) {
// success, we expect this
} else {
if (t.getCause() instanceof MissingBackpressureException) {
// this is also okay
} else {
fail("Expecting MissingBackpressureException");
}
}
}