/**
* https://github.com/ReactiveX/RxJava/issues/198
*
* <p>Rx Design Guidelines 5.2
*
* <p>"when calling the Subscribe method that only has an onNext argument, the OnError behavior
* will be to rethrow the exception on the thread that the message comes out from the Observable.
* The OnCompleted behavior in this case is to do nothing."
*
* @throws InterruptedException
*/
@Test
@Ignore("Subscribers can't throw")
public void testErrorThrownWithoutErrorHandlerAsynchronous() throws InterruptedException {
final CountDownLatch latch = new CountDownLatch(1);
final AtomicReference<Throwable> exception = new AtomicReference<>();
Observable.create(
observer -> {
new Thread(
() -> {
try {
observer.onError(new Error("failure"));
} catch (Throwable e) {
// without an onError handler it has to just throw on whatever thread
// invokes it
exception.set(e);
}
latch.countDown();
})
.start();
})
.subscribe();
// wait for exception
latch.await(3000, TimeUnit.MILLISECONDS);
assertNotNull(exception.get());
assertEquals("failure", exception.get().getMessage());
}
@Test
public void testPublishLast() throws InterruptedException {
final AtomicInteger count = new AtomicInteger();
ConnectableObservable<String> connectable =
Observable.<String>create(
observer -> {
observer.onSubscribe(EmptySubscription.INSTANCE);
count.incrementAndGet();
new Thread(
() -> {
observer.onNext("first");
observer.onNext("last");
observer.onComplete();
})
.start();
})
.takeLast(1)
.publish();
// subscribe once
final CountDownLatch latch = new CountDownLatch(1);
connectable.subscribe(
value -> {
assertEquals("last", value);
latch.countDown();
});
// subscribe twice
connectable.subscribe();
Disposable subscription = connectable.connect();
assertTrue(latch.await(1000, TimeUnit.MILLISECONDS));
assertEquals(1, count.get());
subscription.dispose();
}
@Test
public void testReplay() throws InterruptedException {
final AtomicInteger counter = new AtomicInteger();
ConnectableObservable<String> o =
Observable.<String>create(
observer -> {
observer.onSubscribe(EmptySubscription.INSTANCE);
new Thread(
new Runnable() {
@Override
public void run() {
counter.incrementAndGet();
observer.onNext("one");
observer.onComplete();
}
})
.start();
})
.replay();
// we connect immediately and it will emit the value
Disposable s = o.connect();
try {
// we then expect the following 2 subscriptions to get that same value
final CountDownLatch latch = new CountDownLatch(2);
// subscribe once
o.subscribe(
v -> {
assertEquals("one", v);
latch.countDown();
});
// subscribe again
o.subscribe(
v -> {
assertEquals("one", v);
latch.countDown();
});
if (!latch.await(1000, TimeUnit.MILLISECONDS)) {
fail("subscriptions did not receive values");
}
assertEquals(1, counter.get());
} finally {
s.dispose();
}
}
/**
* The error from the user provided Observer is not handled by the subscribe method try/catch.
*
* <p>It is handled by the AtomicObserver that wraps the provided Observer.
*
* <p>Result: Passes (if AtomicObserver functionality exists)
*/
@Test
public void testCustomObservableWithErrorInObserverAsynchronous() throws InterruptedException {
final CountDownLatch latch = new CountDownLatch(1);
final AtomicInteger count = new AtomicInteger();
final AtomicReference<Throwable> error = new AtomicReference<>();
// FIXME custom built???
Observable.just("1", "2", "three", "4")
.subscribeOn(Schedulers.newThread())
.safeSubscribe(
new Observer<String>() {
@Override
public void onComplete() {
System.out.println("completed");
latch.countDown();
}
@Override
public void onError(Throwable e) {
error.set(e);
System.out.println("error");
e.printStackTrace();
latch.countDown();
}
@Override
public void onNext(String v) {
int num = Integer.parseInt(v);
System.out.println(num);
// doSomething(num);
count.incrementAndGet();
}
});
// wait for async sequence to complete
latch.await();
assertEquals(2, count.get());
assertNotNull(error.get());
if (!(error.get() instanceof NumberFormatException)) {
fail("It should be a NumberFormatException");
}
}
@Test
public void testCacheWithCapacity() throws InterruptedException {
final AtomicInteger counter = new AtomicInteger();
Observable<String> o =
Observable.<String>create(
observer -> {
observer.onSubscribe(EmptySubscription.INSTANCE);
new Thread(
() -> {
counter.incrementAndGet();
observer.onNext("one");
observer.onComplete();
})
.start();
})
.cache(1);
// we then expect the following 2 subscriptions to get that same value
final CountDownLatch latch = new CountDownLatch(2);
// subscribe once
o.subscribe(
v -> {
assertEquals("one", v);
latch.countDown();
});
// subscribe again
o.subscribe(
v -> {
assertEquals("one", v);
latch.countDown();
});
if (!latch.await(1000, TimeUnit.MILLISECONDS)) {
fail("subscriptions did not receive values");
}
assertEquals(1, counter.get());
}