@Test
public void testTakeWithErrorInObserver() {
final AtomicInteger count = new AtomicInteger();
final AtomicReference<Throwable> error = new AtomicReference<>();
Observable.just("1", "2", "three", "4")
.take(3)
.safeSubscribe(
new Observer<String>() {
@Override
public void onComplete() {
System.out.println("completed");
}
@Override
public void onError(Throwable e) {
error.set(e);
System.out.println("error");
e.printStackTrace();
}
@Override
public void onNext(String v) {
int num = Integer.parseInt(v);
System.out.println(num);
// doSomething(num);
count.incrementAndGet();
}
});
assertEquals(2, count.get());
assertNotNull(error.get());
if (!(error.get() instanceof NumberFormatException)) {
fail("It should be a NumberFormatException");
}
}
/**
* The error from the user provided Observable is handled by the subscribe try/catch because this
* is synchronous
*
* <p>Result: Passes
*/
@Test
public void testCustomObservableWithErrorInObservableSynchronous() {
final AtomicInteger count = new AtomicInteger();
final AtomicReference<Throwable> error = new AtomicReference<>();
// FIXME custom built???
Observable.just("1", "2")
.concatWith(Observable.error(() -> new NumberFormatException()))
.subscribe(
new Observer<String>() {
@Override
public void onComplete() {
System.out.println("completed");
}
@Override
public void onError(Throwable e) {
error.set(e);
System.out.println("error");
e.printStackTrace();
}
@Override
public void onNext(String v) {
System.out.println(v);
count.incrementAndGet();
}
});
assertEquals(2, count.get());
assertNotNull(error.get());
if (!(error.get() instanceof NumberFormatException)) {
fail("It should be a NumberFormatException");
}
}
/**
* 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());
}
/**
* 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");
}
}