@Test
public void concatVeryLongObservableOfObservablesTakeHalf() {
final int n = 10000;
Observable<Observable<Integer>> source =
Observable.create(
new OnSubscribe<Observable<Integer>>() {
@Override
public void call(Subscriber<? super Observable<Integer>> s) {
for (int i = 0; i < n; i++) {
if (s.isUnsubscribed()) {
return;
}
s.onNext(Observable.from(i));
}
s.onCompleted();
}
});
Observable<List<Integer>> result = Observable.concat(source).take(n / 2).toList();
Observer<List<Integer>> o = mock(Observer.class);
InOrder inOrder = inOrder(o);
result.subscribe(o);
List<Integer> list = new ArrayList<Integer>(n);
for (int i = 0; i < n / 2; i++) {
list.add(i);
}
inOrder.verify(o).onNext(list);
inOrder.verify(o).onCompleted();
verify(o, never()).onError(any(Throwable.class));
}
/** Simple concat of 2 asynchronous observables ensuring it emits in correct order. */
@SuppressWarnings("unchecked")
@Test
public void testSimpleAsyncConcat() {
Observer<String> observer = mock(Observer.class);
TestObservable<String> o1 = new TestObservable<String>("one", "two", "three");
TestObservable<String> o2 = new TestObservable<String>("four", "five", "six");
Observable.concat(Observable.create(o1), Observable.create(o2)).subscribe(observer);
try {
// wait for async observables to complete
o1.t.join();
o2.t.join();
} catch (Throwable e) {
throw new RuntimeException("failed waiting on threads");
}
InOrder inOrder = inOrder(observer);
inOrder.verify(observer, times(1)).onNext("one");
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)).onNext("five");
inOrder.verify(observer, times(1)).onNext("six");
}
@Test
public void testConcatObservableOfObservables() {
@SuppressWarnings("unchecked")
Observer<String> observer = mock(Observer.class);
final String[] o = {"1", "3", "5", "7"};
final String[] e = {"2", "4", "6"};
final Observable<String> odds = Observable.from(o);
final Observable<String> even = Observable.from(e);
Observable<Observable<String>> observableOfObservables =
Observable.create(
new Observable.OnSubscribeFunc<Observable<String>>() {
@Override
public Subscription onSubscribe(Observer<? super Observable<String>> observer) {
// simulate what would happen in an observable
observer.onNext(odds);
observer.onNext(even);
observer.onCompleted();
return Subscriptions.empty();
}
});
Observable<String> concat = Observable.concat(observableOfObservables);
concat.subscribe(observer);
verify(observer, times(7)).onNext(anyString());
}
@Test
public void testFlatMapTransformsException() {
Observable<Integer> onNext = Observable.from(Arrays.asList(1, 2, 3));
Observable<Integer> onCompleted = Observable.from(Arrays.asList(4));
Observable<Integer> onError = Observable.from(Arrays.asList(5));
Observable<Integer> source =
Observable.concat(
Observable.from(Arrays.asList(10, 20, 30)),
Observable.<Integer>error(new RuntimeException("Forced failure!")));
@SuppressWarnings("unchecked")
Observer<Object> o = mock(Observer.class);
source.flatMap(just(onNext), just(onError), just0(onCompleted)).subscribe(o);
verify(o, times(3)).onNext(1);
verify(o, times(3)).onNext(2);
verify(o, times(3)).onNext(3);
verify(o).onNext(5);
verify(o).onCompleted();
verify(o, never()).onNext(4);
verify(o, never()).onError(any(Throwable.class));
}
@Test
public void testConcatConcurrentWithInfinity() {
final TestObservable<String> w1 = new TestObservable<String>("one", "two", "three");
// This observable will send "hello" MAX_VALUE time.
final TestObservable<String> w2 = new TestObservable<String>("hello", Integer.MAX_VALUE);
@SuppressWarnings("unchecked")
Observer<String> observer = mock(Observer.class);
@SuppressWarnings("unchecked")
TestObservable<Observable<String>> observableOfObservables =
new TestObservable<Observable<String>>(Observable.create(w1), Observable.create(w2));
Observable<String> concatF = Observable.concat(Observable.create(observableOfObservables));
concatF.take(50).subscribe(observer);
// Wait for the thread to start up.
try {
w1.waitForThreadDone();
w2.waitForThreadDone();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
InOrder inOrder = inOrder(observer);
inOrder.verify(observer, times(1)).onNext("one");
inOrder.verify(observer, times(1)).onNext("two");
inOrder.verify(observer, times(1)).onNext("three");
inOrder.verify(observer, times(47)).onNext("hello");
verify(observer, times(1)).onCompleted();
verify(observer, never()).onError(any(Throwable.class));
}
public Observable<V> get(User user, K key) {
return Observable.concat(
fromMemory(user, key),
fromDiskWithCaching(user, key),
fromNetworkWithCaching(user, key))
.first();
}
@Test
public void testConcatNonBlockingObservables() {
final CountDownLatch okToContinueW1 = new CountDownLatch(1);
final CountDownLatch okToContinueW2 = new CountDownLatch(1);
final TestObservable<String> w1 =
new TestObservable<String>(null, okToContinueW1, "one", "two", "three");
final TestObservable<String> w2 =
new TestObservable<String>(null, okToContinueW2, "four", "five", "six");
@SuppressWarnings("unchecked")
Observer<String> observer = mock(Observer.class);
Observable<Observable<String>> observableOfObservables =
Observable.create(
new Observable.OnSubscribeFunc<Observable<String>>() {
@Override
public Subscription onSubscribe(Observer<? super Observable<String>> observer) {
// simulate what would happen in an observable
observer.onNext(Observable.create(w1));
observer.onNext(Observable.create(w2));
observer.onCompleted();
return Subscriptions.empty();
}
});
Observable<String> concat = Observable.concat(observableOfObservables);
concat.subscribe(observer);
verify(observer, times(0)).onCompleted();
try {
// release both threads
okToContinueW1.countDown();
okToContinueW2.countDown();
// wait for both to finish
w1.t.join();
w2.t.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
InOrder inOrder = inOrder(observer);
inOrder.verify(observer, times(1)).onNext("one");
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)).onNext("five");
inOrder.verify(observer, times(1)).onNext("six");
verify(observer, times(1)).onCompleted();
}
@Test
public void testPropogateErrorInTheMiddleOfMultibyte() {
Observable<byte[]> src = Observable.from(new byte[] {(byte) 0xc2});
Observable<byte[]> err = Observable.error(new IOException());
CharsetDecoder charsetDecoder = Charset.forName("UTF-8").newDecoder();
try {
StringObservable.decode(Observable.concat(src, err), charsetDecoder)
.toList()
.toBlockingObservable()
.single();
fail();
} catch (RuntimeException e) {
assertEquals(MalformedInputException.class, e.getCause().getClass());
}
}
@Test
public void testConcat() {
@SuppressWarnings("unchecked")
Observer<String> observer = mock(Observer.class);
final String[] o = {"1", "3", "5", "7"};
final String[] e = {"2", "4", "6"};
final Observable<String> odds = Observable.from(o);
final Observable<String> even = Observable.from(e);
@SuppressWarnings("unchecked")
Observable<String> concat = Observable.concat(odds, even);
concat.subscribe(observer);
verify(observer, times(7)).onNext(anyString());
}
@Test
public void testConcatWithList() {
@SuppressWarnings("unchecked")
Observer<String> observer = mock(Observer.class);
final String[] o = {"1", "3", "5", "7"};
final String[] e = {"2", "4", "6"};
final Observable<String> odds = Observable.from(o);
final Observable<String> even = Observable.from(e);
final List<Observable<String>> list = new ArrayList<Observable<String>>();
list.add(odds);
list.add(even);
Observable<String> concat = Observable.concat(Observable.from(list));
concat.subscribe(observer);
verify(observer, times(7)).onNext(anyString());
}
/**
* All observables will be running in different threads so subscribe() is unblocked.
* CountDownLatch is only used in order to call unsubscribe() in a predictable manner.
*/
@Test
public void testConcatUnsubscribeConcurrent() {
final CountDownLatch callOnce = new CountDownLatch(1);
final CountDownLatch okToContinue = new CountDownLatch(1);
final TestObservable<String> w1 = new TestObservable<String>("one", "two", "three");
final TestObservable<String> w2 =
new TestObservable<String>(callOnce, okToContinue, "four", "five", "six");
@SuppressWarnings("unchecked")
Observer<String> observer = mock(Observer.class);
@SuppressWarnings("unchecked")
TestObservable<Observable<String>> observableOfObservables =
new TestObservable<Observable<String>>(Observable.create(w1), Observable.create(w2));
Observable<String> concatF = Observable.concat(Observable.create(observableOfObservables));
Subscription s1 = concatF.subscribe(observer);
try {
// Block main thread to allow observable "w1" to complete and observable "w2" to call onNext
// exactly once.
callOnce.await();
// "four" from w2 has been processed by onNext()
s1.unsubscribe();
// "five" and "six" will NOT be processed by onNext()
// Unblock the observable to continue.
okToContinue.countDown();
w1.t.join();
w2.t.join();
} catch (Throwable e) {
e.printStackTrace();
fail(e.getMessage());
}
InOrder inOrder = inOrder(observer);
inOrder.verify(observer, times(1)).onNext("one");
inOrder.verify(observer, times(1)).onNext("two");
inOrder.verify(observer, times(1)).onNext("three");
inOrder.verify(observer, times(1)).onNext("four");
inOrder.verify(observer, never()).onNext("five");
inOrder.verify(observer, never()).onNext("six");
verify(observer, never()).onCompleted();
verify(observer, never()).onError(any(Throwable.class));
}
@Test
public void testMultipleObservers() {
Observer<Object> o1 = mock(Observer.class);
Observer<Object> o2 = mock(Observer.class);
TestScheduler s = new TestScheduler();
Observable<Long> timer = Observable.interval(500, TimeUnit.MILLISECONDS, s).take(2);
Observable<Long> o = Observable.concat(timer, timer);
o.subscribe(o1);
o.subscribe(o2);
InOrder inOrder1 = inOrder(o1);
InOrder inOrder2 = inOrder(o2);
s.advanceTimeBy(500, TimeUnit.MILLISECONDS);
inOrder1.verify(o1, times(1)).onNext(0L);
inOrder2.verify(o2, times(1)).onNext(0L);
s.advanceTimeBy(500, TimeUnit.MILLISECONDS);
inOrder1.verify(o1, times(1)).onNext(1L);
inOrder2.verify(o2, times(1)).onNext(1L);
s.advanceTimeBy(500, TimeUnit.MILLISECONDS);
inOrder1.verify(o1, times(1)).onNext(0L);
inOrder2.verify(o2, times(1)).onNext(0L);
s.advanceTimeBy(500, TimeUnit.MILLISECONDS);
inOrder1.verify(o1, times(1)).onNext(1L);
inOrder2.verify(o2, times(1)).onNext(1L);
inOrder1.verify(o1, times(1)).onCompleted();
inOrder2.verify(o2, times(1)).onCompleted();
verify(o1, never()).onError(any(Throwable.class));
verify(o2, never()).onError(any(Throwable.class));
}
@SuppressWarnings("unchecked")
@Test
public void testBlockedObservableOfObservables() {
Observer<String> observer = mock(Observer.class);
final String[] o = {"1", "3", "5", "7"};
final String[] e = {"2", "4", "6"};
final Observable<String> odds = Observable.from(o);
final Observable<String> even = Observable.from(e);
final CountDownLatch callOnce = new CountDownLatch(1);
final CountDownLatch okToContinue = new CountDownLatch(1);
TestObservable<Observable<String>> observableOfObservables =
new TestObservable<Observable<String>>(callOnce, okToContinue, odds, even);
Observable<String> concatF = Observable.concat(Observable.create(observableOfObservables));
concatF.subscribe(observer);
try {
// Block main thread to allow observables to serve up o1.
callOnce.await();
} catch (Throwable ex) {
ex.printStackTrace();
fail(ex.getMessage());
}
// The concated observable should have served up all of the odds.
verify(observer, times(1)).onNext("1");
verify(observer, times(1)).onNext("3");
verify(observer, times(1)).onNext("5");
verify(observer, times(1)).onNext("7");
try {
// unblock observables so it can serve up o2 and complete
okToContinue.countDown();
observableOfObservables.t.join();
} catch (Throwable ex) {
ex.printStackTrace();
fail(ex.getMessage());
}
// The concatenated observable should now have served up all the evens.
verify(observer, times(1)).onNext("2");
verify(observer, times(1)).onNext("4");
verify(observer, times(1)).onNext("6");
}
@Test
public void testDelayedErrorDeliveryWhenSafeSubscriberUnsubscribes() {
TestScheduler testScheduler = new TestScheduler();
Observable<Integer> source =
Observable.concat(Observable.<Integer>error(new TestException()), Observable.just(1));
@SuppressWarnings("unchecked")
Observer<Integer> o = mock(Observer.class);
InOrder inOrder = inOrder(o);
source.observeOn(testScheduler).subscribe(o);
inOrder.verify(o, never()).onError(any(TestException.class));
testScheduler.advanceTimeBy(1, TimeUnit.SECONDS);
inOrder.verify(o).onError(any(TestException.class));
inOrder.verify(o, never()).onNext(anyInt());
inOrder.verify(o, never()).onCompleted();
}
/** Test unsubscribing the concatenated Observable in a single thread. */
@Test
public void testConcatUnsubscribe() {
final CountDownLatch callOnce = new CountDownLatch(1);
final CountDownLatch okToContinue = new CountDownLatch(1);
final TestObservable<String> w1 = new TestObservable<String>("one", "two", "three");
final TestObservable<String> w2 =
new TestObservable<String>(callOnce, okToContinue, "four", "five", "six");
@SuppressWarnings("unchecked")
final Observer<String> observer = mock(Observer.class);
@SuppressWarnings("unchecked")
final Observable<String> concat =
Observable.concat(Observable.create(w1), Observable.create(w2));
try {
// Subscribe
Subscription s1 = concat.subscribe(observer);
// Block main thread to allow observable "w1" to complete and observable "w2" to call onNext
// once.
callOnce.await();
// Unsubcribe
s1.unsubscribe();
// Unblock the observable to continue.
okToContinue.countDown();
w1.t.join();
w2.t.join();
} catch (Throwable e) {
e.printStackTrace();
fail(e.getMessage());
}
InOrder inOrder = inOrder(observer);
inOrder.verify(observer, times(1)).onNext("one");
inOrder.verify(observer, times(1)).onNext("two");
inOrder.verify(observer, times(1)).onNext("three");
inOrder.verify(observer, times(1)).onNext("four");
inOrder.verify(observer, never()).onNext("five");
inOrder.verify(observer, never()).onNext("six");
inOrder.verify(observer, never()).onCompleted();
}
/** Test an async Observable that emits more async Observables */
@SuppressWarnings("unchecked")
@Test
public void testNestedAsyncConcat() throws Throwable {
Observer<String> observer = mock(Observer.class);
final TestObservable<String> o1 = new TestObservable<String>("one", "two", "three");
final TestObservable<String> o2 = new TestObservable<String>("four", "five", "six");
final TestObservable<String> o3 = new TestObservable<String>("seven", "eight", "nine");
final CountDownLatch allowThird = new CountDownLatch(1);
final AtomicReference<Thread> parent = new AtomicReference<Thread>();
final CountDownLatch parentHasStarted = new CountDownLatch(1);
Observable<Observable<String>> observableOfObservables =
Observable.create(
new Observable.OnSubscribeFunc<Observable<String>>() {
@Override
public Subscription onSubscribe(final Observer<? super Observable<String>> observer) {
final BooleanSubscription s = new BooleanSubscription();
parent.set(
new Thread(
new Runnable() {
@Override
public void run() {
try {
// emit first
if (!s.isUnsubscribed()) {
System.out.println("Emit o1");
observer.onNext(Observable.create(o1));
}
// emit second
if (!s.isUnsubscribed()) {
System.out.println("Emit o2");
observer.onNext(Observable.create(o2));
}
// wait until sometime later and emit third
try {
allowThird.await();
} catch (InterruptedException e) {
observer.onError(e);
}
if (!s.isUnsubscribed()) {
System.out.println("Emit o3");
observer.onNext(Observable.create(o3));
}
} catch (Throwable e) {
observer.onError(e);
} finally {
System.out.println("Done parent Observable");
observer.onCompleted();
}
}
}));
parent.get().start();
parentHasStarted.countDown();
return s;
}
});
Observable.concat(observableOfObservables).subscribe(observer);
// wait for parent to start
parentHasStarted.await();
try {
// wait for first 2 async observables to complete
System.out.println("Thread1 is starting ... waiting for it to complete ...");
o1.waitForThreadDone();
System.out.println("Thread2 is starting ... waiting for it to complete ...");
o2.waitForThreadDone();
} catch (Throwable e) {
throw new RuntimeException("failed waiting on threads", e);
}
InOrder inOrder = inOrder(observer);
inOrder.verify(observer, times(1)).onNext("one");
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)).onNext("five");
inOrder.verify(observer, times(1)).onNext("six");
// we shouldn't have the following 3 yet
inOrder.verify(observer, never()).onNext("seven");
inOrder.verify(observer, never()).onNext("eight");
inOrder.verify(observer, never()).onNext("nine");
// we should not be completed yet
verify(observer, never()).onCompleted();
verify(observer, never()).onError(any(Throwable.class));
// now allow the third
allowThird.countDown();
try {
// wait for 3rd to complete
o3.waitForThreadDone();
} catch (Throwable e) {
throw new RuntimeException("failed waiting on threads", e);
}
inOrder.verify(observer, times(1)).onNext("seven");
inOrder.verify(observer, times(1)).onNext("eight");
inOrder.verify(observer, times(1)).onNext("nine");
inOrder.verify(observer, times(1)).onCompleted();
verify(observer, never()).onError(any(Throwable.class));
}
/**
* Perform a long operation to be used in the main thread
*
* @param maxResults
* @return
*/
@Override
public Observable<List<Promotion>> queryLastestPromotion(int maxResults) {
return Observable.concat(queryLocalPromotions(), queryServerPromotions())
.observeOn(AndroidSchedulers.mainThread());
}