/**
* Can receive timeout if subscribe never receives an onError/onCompleted ... which reveals a race
* condition.
*/
@Test(timeout = 10000)
public void testSubscribeCompletionRaceCondition() {
for (int i = 0; i < 50; i++) {
final ReplaySubject<String> subject = ReplaySubject.create();
final AtomicReference<String> value1 = new AtomicReference<String>();
subject.subscribe(
new Action1<String>() {
@Override
public void call(String t1) {
try {
// simulate a slow observer
Thread.sleep(50);
} catch (InterruptedException e) {
e.printStackTrace();
}
value1.set(t1);
}
});
Thread t1 =
new Thread(
new Runnable() {
@Override
public void run() {
subject.onNext("value");
subject.onCompleted();
}
});
SubjectObserverThread t2 = new SubjectObserverThread(subject);
SubjectObserverThread t3 = new SubjectObserverThread(subject);
SubjectObserverThread t4 = new SubjectObserverThread(subject);
SubjectObserverThread t5 = new SubjectObserverThread(subject);
t2.start();
t3.start();
t1.start();
t4.start();
t5.start();
try {
t1.join();
t2.join();
t3.join();
t4.join();
t5.join();
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
assertEquals("value", value1.get());
assertEquals("value", t2.value.get());
assertEquals("value", t3.value.get());
assertEquals("value", t4.value.get());
assertEquals("value", t5.value.get());
}
}
@Override
public void run() {
try {
// a timeout exception will happen if we don't get a terminal state
String v = subject.timeout(2000, TimeUnit.MILLISECONDS).toBlocking().single();
value.set(v);
} catch (Exception e) {
e.printStackTrace();
}
}
@Test
public void testErrorThrownIssue1685() {
Subject<Object, Object> subject = ReplaySubject.create();
Observable.error(new RuntimeException("oops"))
.materialize()
.delay(1, TimeUnit.SECONDS)
.dematerialize()
.subscribe(subject);
subject.subscribe();
subject.materialize().toBlocking().first();
System.out.println("Done");
}
@Test(timeout = 4000)
public void testReplaySubjectConcurrentSubscribersDoingReplayDontBlockEachOther()
throws InterruptedException {
final ReplaySubject<Long> replay = ReplaySubject.create();
Thread source =
new Thread(
new Runnable() {
@Override
public void run() {
Observable.create(
new OnSubscribe<Long>() {
@Override
public void call(Subscriber<? super Long> o) {
System.out.println("********* Start Source Data ***********");
for (long l = 1; l <= 10000; l++) {
o.onNext(l);
}
System.out.println("********* Finished Source Data ***********");
o.onCompleted();
}
})
.subscribe(replay);
}
});
source.start();
long v = replay.toBlocking().last();
assertEquals(10000, v);
// it's been played through once so now it will all be replays
final CountDownLatch slowLatch = new CountDownLatch(1);
Thread slowThread =
new Thread(
new Runnable() {
@Override
public void run() {
Subscriber<Long> slow =
new Subscriber<Long>() {
@Override
public void onCompleted() {
System.out.println("*** Slow Observer completed");
slowLatch.countDown();
}
@Override
public void onError(Throwable e) {}
@Override
public void onNext(Long args) {
if (args == 1) {
System.out.println("*** Slow Observer STARTED");
}
try {
if (args % 10 == 0) {
Thread.sleep(1);
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}
};
replay.subscribe(slow);
try {
slowLatch.await();
} catch (InterruptedException e1) {
e1.printStackTrace();
}
}
});
slowThread.start();
Thread fastThread =
new Thread(
new Runnable() {
@Override
public void run() {
final CountDownLatch fastLatch = new CountDownLatch(1);
Subscriber<Long> fast =
new Subscriber<Long>() {
@Override
public void onCompleted() {
System.out.println("*** Fast Observer completed");
fastLatch.countDown();
}
@Override
public void onError(Throwable e) {}
@Override
public void onNext(Long args) {
if (args == 1) {
System.out.println("*** Fast Observer STARTED");
}
}
};
replay.subscribe(fast);
try {
fastLatch.await();
} catch (InterruptedException e1) {
e1.printStackTrace();
}
}
});
fastThread.start();
fastThread.join();
// slow should not yet be completed when fast completes
assertEquals(1, slowLatch.getCount());
slowThread.join();
}
@Test
public void testReplaySubjectConcurrentSubscriptions() throws InterruptedException {
final ReplaySubject<Long> replay = ReplaySubject.create();
Thread source =
new Thread(
new Runnable() {
@Override
public void run() {
Observable.create(
new OnSubscribe<Long>() {
@Override
public void call(Subscriber<? super Long> o) {
System.out.println("********* Start Source Data ***********");
for (long l = 1; l <= 10000; l++) {
o.onNext(l);
}
System.out.println("********* Finished Source Data ***********");
o.onCompleted();
}
})
.subscribe(replay);
}
});
// used to collect results of each thread
final List<List<Long>> listOfListsOfValues =
Collections.synchronizedList(new ArrayList<List<Long>>());
final List<Thread> threads = Collections.synchronizedList(new ArrayList<Thread>());
for (int i = 1; i <= 200; i++) {
final int count = i;
if (count == 20) {
// start source data after we have some already subscribed
// and while others are in process of subscribing
source.start();
}
if (count == 100) {
// wait for source to finish then keep adding after it's done
source.join();
}
Thread t =
new Thread(
new Runnable() {
@Override
public void run() {
List<Long> values = replay.toList().toBlocking().last();
listOfListsOfValues.add(values);
System.out.println("Finished thread: " + count);
}
});
t.start();
System.out.println("Started thread: " + i);
threads.add(t);
}
// wait for all threads to complete
for (Thread t : threads) {
t.join();
}
// assert all threads got the same results
List<Long> sums = new ArrayList<Long>();
for (List<Long> values : listOfListsOfValues) {
long v = 0;
for (long l : values) {
v += l;
}
sums.add(v);
}
long expected = sums.get(0);
boolean success = true;
for (long l : sums) {
if (l != expected) {
success = false;
System.out.println("FAILURE => Expected " + expected + " but got: " + l);
}
}
if (success) {
System.out.println("Success! " + sums.size() + " each had the same sum of " + expected);
} else {
throw new RuntimeException("Concurrency Bug");
}
}
