/**
* Copyright (c) 2016-present, RxJava Contributors.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License is
* distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
* the License for the specific language governing permissions and limitations under the License.
*/
package io.reactivex.subjects;
import static org.junit.Assert.assertEquals;
import java.util.*;
import java.util.concurrent.*;
import java.util.concurrent.atomic.AtomicReference;
import org.junit.*;
import io.reactivex.*;
import io.reactivex.Observable;
import io.reactivex.Observer;
import io.reactivex.disposables.Disposables;
import io.reactivex.functions.Consumer;
import io.reactivex.observers.*;
import io.reactivex.schedulers.Schedulers;
public class ReplaySubjectConcurrencyTest {
@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.unsafeCreate(new ObservableSource<Long>() {
@Override
public void subscribe(Observer<? super Long> o) {
o.onSubscribe(Disposables.empty());
System.out.println("********* Start Source Data ***********");
for (long l = 1; l <= 10000; l++) {
o.onNext(l);
}
System.out.println("********* Finished Source Data ***********");
o.onComplete();
}
}).subscribe(replay);
}
});
source.start();
long v = replay.blockingLast();
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() {
Observer<Long> slow = new DefaultObserver<Long>() {
@Override
public void onComplete() {
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);
Observer<Long> fast = new DefaultObserver<Long>() {
@Override
public void onComplete() {
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.unsafeCreate(new ObservableSource<Long>() {
@Override
public void subscribe(Observer<? super Long> o) {
o.onSubscribe(Disposables.empty());
System.out.println("********* Start Source Data ***********");
for (long l = 1; l <= 10000; l++) {
o.onNext(l);
}
System.out.println("********* Finished Source Data ***********");
o.onComplete();
}
}).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().blockingGet();
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");
}
}
/**
* Can receive timeout if subscribe never receives an onError/onComplete ... 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 Consumer<String>() {
@Override
public void accept(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.onComplete();
}
});
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());
}
}
/**
* https://github.com/ReactiveX/RxJava/issues/1147
*/
@Test
public void testRaceForTerminalState() {
final List<Integer> expected = Arrays.asList(1);
for (int i = 0; i < 100000; i++) {
TestObserver<Integer> ts = new TestObserver<Integer>();
Observable.just(1).subscribeOn(Schedulers.computation()).cache().subscribe(ts);
ts.awaitTerminalEvent();
ts.assertValueSequence(expected);
ts.assertTerminated();
}
}
static class SubjectObserverThread extends Thread {
private final ReplaySubject<String> subject;
private final AtomicReference<String> value = new AtomicReference<String>();
SubjectObserverThread(ReplaySubject<String> subject) {
this.subject = subject;
}
@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).blockingSingle();
value.set(v);
} catch (Exception e) {
e.printStackTrace();
}
}
}
@Test
public void testReplaySubjectEmissionSubscriptionRace() throws Exception {
Scheduler s = Schedulers.io();
Scheduler.Worker worker = Schedulers.io().createWorker();
try {
for (int i = 0; i < 50000; i++) {
if (i % 1000 == 0) {
System.out.println(i);
}
final ReplaySubject<Object> rs = ReplaySubject.create();
final CountDownLatch finish = new CountDownLatch(1);
final CountDownLatch start = new CountDownLatch(1);
worker.schedule(new Runnable() {
@Override
public void run() {
try {
start.await();
} catch (Exception e1) {
e1.printStackTrace();
}
rs.onNext(1);
}
});
final AtomicReference<Object> o = new AtomicReference<Object>();
rs.subscribeOn(s).observeOn(Schedulers.io())
.subscribe(new DefaultObserver<Object>() {
@Override
public void onComplete() {
o.set(-1);
finish.countDown();
}
@Override
public void onError(Throwable e) {
o.set(e);
finish.countDown();
}
@Override
public void onNext(Object t) {
o.set(t);
finish.countDown();
}
});
start.countDown();
if (!finish.await(5, TimeUnit.SECONDS)) {
System.out.println(o.get());
System.out.println(rs.hasObservers());
rs.onComplete();
Assert.fail("Timeout @ " + i);
break;
} else {
Assert.assertEquals(1, o.get());
worker.schedule(new Runnable() {
@Override
public void run() {
rs.onComplete();
}
});
}
}
} finally {
worker.dispose();
}
}
@Test(timeout = 10000)
public void testConcurrentSizeAndHasAnyValue() throws InterruptedException {
final ReplaySubject<Object> rs = ReplaySubject.create();
final CyclicBarrier cb = new CyclicBarrier(2);
Thread t = new Thread(new Runnable() {
@Override
public void run() {
try {
cb.await();
} catch (InterruptedException e) {
return;
} catch (BrokenBarrierException e) {
return;
}
for (int i = 0; i < 1000000; i++) {
rs.onNext(i);
}
rs.onComplete();
System.out.println("Replay fill Thread finished!");
}
});
t.start();
try {
cb.await();
} catch (InterruptedException e) {
return;
} catch (BrokenBarrierException e) {
return;
}
int lastSize = 0;
for (; !rs.hasThrowable() && !rs.hasComplete();) {
int size = rs.size();
boolean hasAny = rs.hasValue();
Object[] values = rs.getValues();
if (size < lastSize) {
Assert.fail("Size decreased! " + lastSize + " -> " + size);
}
if ((size > 0) && !hasAny) {
Assert.fail("hasAnyValue reports emptyness but size doesn't");
}
if (size > values.length) {
Assert.fail("Got fewer values than size! " + size + " -> " + values.length);
}
lastSize = size;
}
t.join();
}
}