iframe-proxy | Sunbelt Computer Software

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 * Copyright 2014 Netflix, Inc.
 * 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 rx.subjects;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import static org.mockito.Matchers.any;
import static org.mockito.Mockito.inOrder;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.never;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.verifyNoMoreInteractions;
import java.util.Arrays;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;
import org.junit.Test;
import org.mockito.InOrder;
import rx.Observable;
import rx.Observer;
import rx.Subscriber;
import rx.Subscription;
import rx.exceptions.CompositeException;
import rx.exceptions.OnErrorNotImplementedException;
import rx.exceptions.TestException;
import rx.functions.Func1;
import rx.observers.TestSubscriber;
import rx.schedulers.Schedulers;
import rx.schedulers.TestScheduler;
public class ReplaySubjectTest {
    private final Throwable testException = new Throwable();
    @SuppressWarnings("unchecked")
    public void testCompleted() {
        ReplaySubject<String> subject = ReplaySubject.create();
        Observer<String> o1 = mock(Observer.class);
        subject.subscribe(o1);
        subject.onNext("one");
        subject.onNext("two");
        subject.onNext("three");
        subject.onCompleted();
        subject.onNext("four");
        subject.onCompleted();
        subject.onError(new Throwable());
        assertCompletedObserver(o1);
        // assert that subscribing a 2nd time gets the same data
        Observer<String> o2 = mock(Observer.class);
        subject.subscribe(o2);
        assertCompletedObserver(o2);
    public void testCompletedStopsEmittingData() {
        ReplaySubject<Integer> channel = ReplaySubject.create();
        @SuppressWarnings("unchecked")
        Observer<Object> observerA = mock(Observer.class);
        @SuppressWarnings("unchecked")
        Observer<Object> observerB = mock(Observer.class);
        @SuppressWarnings("unchecked")
        Observer<Object> observerC = mock(Observer.class);
        @SuppressWarnings("unchecked")
        Observer<Object> observerD = mock(Observer.class);
        Subscription a = channel.subscribe(observerA);
        channel.subscribe(observerB);
        InOrder inOrderA = inOrder(observerA);
        InOrder inOrderB = inOrder(observerB);
        InOrder inOrderC = inOrder(observerC);
        InOrder inOrderD = inOrder(observerD);
        channel.onNext(42);
        // both A and B should have received 42 from before subscription
        inOrderA.verify(observerA).onNext(42);
        inOrderB.verify(observerB).onNext(42);
        a.unsubscribe();
        // a should receive no more
        inOrderA.verifyNoMoreInteractions();
        channel.onNext(4711);
        // only be should receive 4711 at this point
        inOrderB.verify(observerB).onNext(4711);
        channel.onCompleted();
        // B is subscribed so should receive onCompleted
        inOrderB.verify(observerB).onCompleted();
        channel.subscribe(observerC);
        // when C subscribes it should receive 42, 4711, onCompleted
        inOrderC.verify(observerC).onNext(42);
        inOrderC.verify(observerC).onNext(4711);
        inOrderC.verify(observerC).onCompleted();
        // if further events are propagated they should be ignored
        channel.onNext(13);
        channel.onNext(14);
        channel.onNext(15);
        channel.onError(new RuntimeException());
        // a new subscription should only receive what was emitted prior to terminal state onCompleted
        channel.subscribe(observerD);
        inOrderD.verify(observerD).onNext(42);
        inOrderD.verify(observerD).onNext(4711);
        inOrderD.verify(observerD).onCompleted();
        verifyNoMoreInteractions(observerA);
        verifyNoMoreInteractions(observerB);
        verifyNoMoreInteractions(observerC);
        verifyNoMoreInteractions(observerD);
    public void testCompletedAfterError() {
        ReplaySubject<String> subject = ReplaySubject.create();
        @SuppressWarnings("unchecked")
        Observer<String> observer = mock(Observer.class);
        subject.onNext("one");
        subject.onError(testException);
        subject.onNext("two");
        subject.onCompleted();
        subject.onError(new RuntimeException());
        subject.subscribe(observer);
        verify(observer, times(1)).onNext("one");
        verify(observer, times(1)).onError(testException);
        verifyNoMoreInteractions(observer);
    private void assertCompletedObserver(Observer<String> observer) {
        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, never()).onError(any(Throwable.class));
        inOrder.verify(observer, times(1)).onCompleted();
        inOrder.verifyNoMoreInteractions();
    @SuppressWarnings("unchecked")
    public void testError() {
        ReplaySubject<String> subject = ReplaySubject.create();
        Observer<String> observer = mock(Observer.class);
        subject.subscribe(observer);
        subject.onNext("one");
        subject.onNext("two");
        subject.onNext("three");
        subject.onError(testException);
        subject.onNext("four");
        subject.onError(new Throwable());
        subject.onCompleted();
        assertErrorObserver(observer);
        observer = mock(Observer.class);
        subject.subscribe(observer);
        assertErrorObserver(observer);
    private void assertErrorObserver(Observer<String> observer) {
        verify(observer, times(1)).onNext("one");
        verify(observer, times(1)).onNext("two");
        verify(observer, times(1)).onNext("three");
        verify(observer, times(1)).onError(testException);
        verify(observer, never()).onCompleted();
    @SuppressWarnings("unchecked")
    public void testSubscribeMidSequence() {
        ReplaySubject<String> subject = ReplaySubject.create();
        Observer<String> observer = mock(Observer.class);
        subject.subscribe(observer);
        subject.onNext("one");
        subject.onNext("two");
        assertObservedUntilTwo(observer);
        Observer<String> anotherObserver = mock(Observer.class);
        subject.subscribe(anotherObserver);
        assertObservedUntilTwo(anotherObserver);
        subject.onNext("three");
        subject.onCompleted();
        assertCompletedObserver(observer);
        assertCompletedObserver(anotherObserver);
    @SuppressWarnings("unchecked")
    public void testUnsubscribeFirstObserver() {
        ReplaySubject<String> subject = ReplaySubject.create();
        Observer<String> observer = mock(Observer.class);
        Subscription subscription = subject.subscribe(observer);
        subject.onNext("one");
        subject.onNext("two");
        subscription.unsubscribe();
        assertObservedUntilTwo(observer);
        Observer<String> anotherObserver = mock(Observer.class);
        subject.subscribe(anotherObserver);
        assertObservedUntilTwo(anotherObserver);
        subject.onNext("three");
        subject.onCompleted();
        assertObservedUntilTwo(observer);
        assertCompletedObserver(anotherObserver);
    private void assertObservedUntilTwo(Observer<String> observer) {
        verify(observer, times(1)).onNext("one");
        verify(observer, times(1)).onNext("two");
        verify(observer, never()).onNext("three");
        verify(observer, never()).onError(any(Throwable.class));
        verify(observer, never()).onCompleted();
    @Test(timeout = 2000)
    public void testNewSubscriberDoesntBlockExisting() throws InterruptedException {
        final AtomicReference<String> lastValueForObserver1 = new AtomicReference<String>();
        Subscriber<String> observer1 = new Subscriber<String>() {
            @Override
            public void onCompleted() {
            @Override
            public void onError(Throwable e) {
            @Override
            public void onNext(String v) {
                System.out.println("observer1: " + v);
                lastValueForObserver1.set(v);
        final AtomicReference<String> lastValueForObserver2 = new AtomicReference<String>();
        final CountDownLatch oneReceived = new CountDownLatch(1);
        final CountDownLatch makeSlow = new CountDownLatch(1);
        final CountDownLatch completed = new CountDownLatch(1);
        Subscriber<String> observer2 = new Subscriber<String>() {
            @Override
            public void onCompleted() {
                completed.countDown();
            @Override
            public void onError(Throwable e) {
            @Override
            public void onNext(String v) {
                System.out.println("observer2: " + v);
                if (v.equals("one")) {
                    oneReceived.countDown();
                } else {
                        makeSlow.await();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    lastValueForObserver2.set(v);
        ReplaySubject<String> subject = ReplaySubject.create();
        subject.subscribe(observer1);
        subject.onNext("one");
        assertEquals("one", lastValueForObserver1.get());
        subject.onNext("two");
        assertEquals("two", lastValueForObserver1.get());
        // use subscribeOn to make this async otherwise we deadlock as we are using CountDownLatches
        subject.subscribeOn(Schedulers.newThread()).subscribe(observer2);
        System.out.println("before waiting for one");
        // wait until observer2 starts having replay occur
        oneReceived.await();
        System.out.println("after waiting for one");
        subject.onNext("three");
        System.out.println("sent three");
        // if subscription blocked existing subscribers then 'makeSlow' would cause this to not be there yet 
        assertEquals("three", lastValueForObserver1.get());
        System.out.println("about to send onCompleted");
        subject.onCompleted();
        System.out.println("completed subject");
        // release 
        makeSlow.countDown();
        System.out.println("makeSlow released");
        completed.await();
        // all of them should be emitted with the last being "three"
        assertEquals("three", lastValueForObserver2.get());
    public void testSubscriptionLeak() {
        ReplaySubject<Object> replaySubject = ReplaySubject.create();
        Subscription s = replaySubject.subscribe();
        assertEquals(1, replaySubject.subscriberCount());
        s.unsubscribe();
        assertEquals(0, replaySubject.subscriberCount());
    @Test(timeout = 1000)
    public void testUnsubscriptionCase() {
        ReplaySubject<String> src = ReplaySubject.create();
        for (int i = 0; i < 10; i++) {
            @SuppressWarnings("unchecked")
            final Observer<Object> o = mock(Observer.class);
            InOrder inOrder = inOrder(o);
            String v = "" + i;
            src.onNext(v);
            System.out.printf("Turn: %d%n", i);
            src.first()
                .flatMap(new Func1<String, Observable<String>>() {
                    @Override
                    public Observable<String> call(String t1) {
                        return Observable.just(t1 + ", " + t1);
                .subscribe(new Observer<String>() {
                    @Override
                    public void onNext(String t) {
                        System.out.println(t);
                        o.onNext(t);
                    @Override
                    public void onError(Throwable e) {
                        o.onError(e);
                    @Override
                    public void onCompleted() {
                        o.onCompleted();
            inOrder.verify(o).onNext("0, 0");
            inOrder.verify(o).onCompleted();
            verify(o, never()).onError(any(Throwable.class));
    public void testTerminateOnce() {
        ReplaySubject<Integer> source = ReplaySubject.create();
        source.onNext(1);
        source.onNext(2);
        source.onCompleted();
        @SuppressWarnings("unchecked")
        final Observer<Integer> o = mock(Observer.class);
        source.unsafeSubscribe(new Subscriber<Integer>() {
            @Override
            public void onNext(Integer t) {
                o.onNext(t);
            @Override
            public void onError(Throwable e) {
                o.onError(e);
            @Override
            public void onCompleted() {
                o.onCompleted();
        });
        verify(o).onNext(1);
        verify(o).onNext(2);
        verify(o).onCompleted();
        verify(o, never()).onError(any(Throwable.class));
    public void testNodeListSimpleAddRemove() {
        ReplaySubject.NodeList<Integer> list = new ReplaySubject.NodeList<Integer>();
        assertEquals(0, list.size());
        // add and remove one
        list.addLast(1);
        assertEquals(1, list.size());
        assertEquals((Integer)1, list.removeFirst());
        assertEquals(0, list.size());
        // add and remove one again
        list.addLast(1);
        assertEquals(1, list.size());
        assertEquals((Integer)1, list.removeFirst());
        // add and remove two items
        list.addLast(1);
        list.addLast(2);
        assertEquals(2, list.size());
        assertEquals((Integer)1, list.removeFirst());
        assertEquals((Integer)2, list.removeFirst());
        assertEquals(0, list.size());
        // clear two items
        list.addLast(1);
        list.addLast(2);
        assertEquals(2, list.size());
        list.clear();
        assertEquals(0, list.size());
    public void testReplay1AfterTermination() {
        ReplaySubject<Integer> source = ReplaySubject.createWithSize(1);
        source.onNext(1);
        source.onNext(2);
        source.onCompleted();
        for (int i = 0; i < 1; i++) {
            @SuppressWarnings("unchecked")
            Observer<Integer> o = mock(Observer.class);
            source.subscribe(o);
            verify(o, never()).onNext(1);
            verify(o).onNext(2);
            verify(o).onCompleted();
            verify(o, never()).onError(any(Throwable.class));
    public void testReplay1Directly() {
        ReplaySubject<Integer> source = ReplaySubject.createWithSize(1);
        @SuppressWarnings("unchecked")
        Observer<Integer> o = mock(Observer.class);
        source.onNext(1);
        source.onNext(2);
        source.subscribe(o);
        source.onNext(3);
        source.onCompleted();
        verify(o, never()).onNext(1);
        verify(o).onNext(2);
        verify(o).onNext(3);
        verify(o).onCompleted();
        verify(o, never()).onError(any(Throwable.class));
    public void testReplayTimestampedAfterTermination() {
        TestScheduler scheduler = new TestScheduler();
        ReplaySubject<Integer> source = ReplaySubject.createWithTime(1, TimeUnit.SECONDS, scheduler);
        source.onNext(1);
        scheduler.advanceTimeBy(1, TimeUnit.SECONDS);
        source.onNext(2);
        scheduler.advanceTimeBy(1, TimeUnit.SECONDS);
        source.onNext(3);
        source.onCompleted();
        scheduler.advanceTimeBy(1, TimeUnit.SECONDS);
        @SuppressWarnings("unchecked")
        Observer<Integer> o = mock(Observer.class);
        source.subscribe(o);
        verify(o, never()).onNext(1);
        verify(o, never()).onNext(2);
        verify(o).onNext(3);
        verify(o).onCompleted();
        verify(o, never()).onError(any(Throwable.class));
    public void testReplayTimestampedDirectly() {
        TestScheduler scheduler = new TestScheduler();
        ReplaySubject<Integer> source = ReplaySubject.createWithTime(1, TimeUnit.SECONDS, scheduler);
        source.onNext(1);
        scheduler.advanceTimeBy(1, TimeUnit.SECONDS);
        @SuppressWarnings("unchecked")
        Observer<Integer> o = mock(Observer.class);
        source.subscribe(o);
        source.onNext(2);
        scheduler.advanceTimeBy(1, TimeUnit.SECONDS);
        source.onNext(3);
        scheduler.advanceTimeBy(1, TimeUnit.SECONDS);
        source.onCompleted();
        scheduler.advanceTimeBy(1, TimeUnit.SECONDS);
        verify(o, never()).onError(any(Throwable.class));
        verify(o, never()).onNext(1);
        verify(o).onNext(2);
        verify(o).onNext(3);
        verify(o).onCompleted();
    public void testOnErrorThrowsDoesntPreventDelivery() {
        ReplaySubject<String> ps = ReplaySubject.create();
        ps.subscribe();
        TestSubscriber<String> ts = new TestSubscriber<String>();
        ps.subscribe(ts);
        try {
            ps.onError(new RuntimeException("an exception"));
            fail("expect OnErrorNotImplementedException");
        } catch (OnErrorNotImplementedException e) {
            // ignore
        // even though the onError above throws we should still receive it on the other subscriber 
        assertEquals(1, ts.getOnErrorEvents().size());
     * This one has multiple failures so should get a CompositeException
    public void testOnErrorThrowsDoesntPreventDelivery2() {
        ReplaySubject<String> ps = ReplaySubject.create();
        ps.subscribe();
        ps.subscribe();
        TestSubscriber<String> ts = new TestSubscriber<String>();
        ps.subscribe(ts);
        ps.subscribe();
        ps.subscribe();
        ps.subscribe();
        try {
            ps.onError(new RuntimeException("an exception"));
            fail("expect OnErrorNotImplementedException");
        } catch (CompositeException e) {
            // we should have 5 of them
            assertEquals(5, e.getExceptions().size());
        // even though the onError above throws we should still receive it on the other subscriber 
        assertEquals(1, ts.getOnErrorEvents().size());
    public void testCurrentStateMethodsNormal() {
        ReplaySubject<Object> as = ReplaySubject.create();
        assertFalse(as.hasThrowable());
        assertFalse(as.hasCompleted());
        assertNull(as.getThrowable());
        as.onNext(1);
        assertFalse(as.hasThrowable());
        assertFalse(as.hasCompleted());
        assertNull(as.getThrowable());
        as.onCompleted();
        assertFalse(as.hasThrowable());
        assertTrue(as.hasCompleted());
        assertNull(as.getThrowable());
    public void testCurrentStateMethodsEmpty() {
        ReplaySubject<Object> as = ReplaySubject.create();
        assertFalse(as.hasThrowable());
        assertFalse(as.hasCompleted());
        assertNull(as.getThrowable());
        as.onCompleted();
        assertFalse(as.hasThrowable());
        assertTrue(as.hasCompleted());
        assertNull(as.getThrowable());
    public void testCurrentStateMethodsError() {
        ReplaySubject<Object> as = ReplaySubject.create();
        assertFalse(as.hasThrowable());
        assertFalse(as.hasCompleted());
        assertNull(as.getThrowable());
        as.onError(new TestException());
        assertTrue(as.hasThrowable());
        assertFalse(as.hasCompleted());
        assertTrue(as.getThrowable() instanceof TestException);
    public void testSizeAndHasAnyValueUnbounded() {
        ReplaySubject<Object> rs = ReplaySubject.create();
        assertEquals(0, rs.size());
        assertFalse(rs.hasAnyValue());
        rs.onNext(1);
        assertEquals(1, rs.size());
        assertTrue(rs.hasAnyValue());
        rs.onNext(1);
        assertEquals(2, rs.size());
        assertTrue(rs.hasAnyValue());
        rs.onCompleted();
        assertEquals(2, rs.size());
        assertTrue(rs.hasAnyValue());
    public void testSizeAndHasAnyValueEffectivelyUnbounded() {
        ReplaySubject<Object> rs = ReplaySubject.createUnbounded();
        assertEquals(0, rs.size());
        assertFalse(rs.hasAnyValue());
        rs.onNext(1);
        assertEquals(1, rs.size());
        assertTrue(rs.hasAnyValue());
        rs.onNext(1);
        assertEquals(2, rs.size());
        assertTrue(rs.hasAnyValue());
        rs.onCompleted();
        assertEquals(2, rs.size());
        assertTrue(rs.hasAnyValue());
    public void testSizeAndHasAnyValueUnboundedError() {
        ReplaySubject<Object> rs = ReplaySubject.create();
        assertEquals(0, rs.size());
        assertFalse(rs.hasAnyValue());
        rs.onNext(1);
        assertEquals(1, rs.size());
        assertTrue(rs.hasAnyValue());
        rs.onNext(1);
        assertEquals(2, rs.size());
        assertTrue(rs.hasAnyValue());
        rs.onError(new TestException());
        assertEquals(2, rs.size());
        assertTrue(rs.hasAnyValue());
    public void testSizeAndHasAnyValueEffectivelyUnboundedError() {
        ReplaySubject<Object> rs = ReplaySubject.createUnbounded();
        assertEquals(0, rs.size());
        assertFalse(rs.hasAnyValue());
        rs.onNext(1);
        assertEquals(1, rs.size());
        assertTrue(rs.hasAnyValue());
        rs.onNext(1);
        assertEquals(2, rs.size());
        assertTrue(rs.hasAnyValue());
        rs.onError(new TestException());
        assertEquals(2, rs.size());
        assertTrue(rs.hasAnyValue());
    public void testSizeAndHasAnyValueUnboundedEmptyError() {
        ReplaySubject<Object> rs = ReplaySubject.create();
        rs.onError(new TestException());
        assertEquals(0, rs.size());
        assertFalse(rs.hasAnyValue());
    public void testSizeAndHasAnyValueEffectivelyUnboundedEmptyError() {
        ReplaySubject<Object> rs = ReplaySubject.createUnbounded();
        rs.onError(new TestException());
        assertEquals(0, rs.size());
        assertFalse(rs.hasAnyValue());
    public void testSizeAndHasAnyValueUnboundedEmptyCompleted() {
        ReplaySubject<Object> rs = ReplaySubject.create();
        rs.onCompleted();
        assertEquals(0, rs.size());
        assertFalse(rs.hasAnyValue());
    public void testSizeAndHasAnyValueEffectivelyUnboundedEmptyCompleted() {
        ReplaySubject<Object> rs = ReplaySubject.createUnbounded();
        rs.onCompleted();
        assertEquals(0, rs.size());
        assertFalse(rs.hasAnyValue());
    public void testSizeAndHasAnyValueSizeBounded() {
        ReplaySubject<Object> rs = ReplaySubject.createWithSize(1);
        assertEquals(0, rs.size());
        assertFalse(rs.hasAnyValue());
        for (int i = 0; i < 1000; i++) {
            rs.onNext(i);
            assertEquals(1, rs.size());
            assertTrue(rs.hasAnyValue());
        rs.onCompleted();
        assertEquals(1, rs.size());
        assertTrue(rs.hasAnyValue());
    public void testSizeAndHasAnyValueTimeBounded() {
        TestScheduler ts = new TestScheduler();
        ReplaySubject<Object> rs = ReplaySubject.createWithTime(1, TimeUnit.SECONDS, ts);
        assertEquals(0, rs.size());
        assertFalse(rs.hasAnyValue());
        for (int i = 0; i < 1000; i++) {
            rs.onNext(i);
            ts.advanceTimeBy(2, TimeUnit.SECONDS);
            assertEquals(1, rs.size());
            assertTrue(rs.hasAnyValue());
        rs.onCompleted();
        assertEquals(0, rs.size());
        assertFalse(rs.hasAnyValue());
    public void testGetValues() {
        ReplaySubject<Object> rs = ReplaySubject.create();
        Object[] expected = new Object[10];
        for (int i = 0; i < expected.length; i++) {
            expected[i] = i;
            rs.onNext(i);
            assertArrayEquals(Arrays.copyOf(expected, i + 1), rs.getValues());
        rs.onCompleted();
        assertArrayEquals(expected, rs.getValues());
    public void testGetValuesUnbounded() {
        ReplaySubject<Object> rs = ReplaySubject.createUnbounded();
        Object[] expected = new Object[10];
        for (int i = 0; i < expected.length; i++) {
            expected[i] = i;
            rs.onNext(i);
            assertArrayEquals(Arrays.copyOf(expected, i + 1), rs.getValues());
        rs.onCompleted();
        assertArrayEquals(expected, rs.getValues());
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