/**
* 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.internal.operators;
import static org.junit.Assert.assertEquals;
import static org.mockito.Mockito.inOrder;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.times;
import static rx.internal.operators.OnSubscribeAmb.amb;
import java.io.IOException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;
import org.junit.Before;
import org.junit.Test;
import org.mockito.InOrder;
import rx.Observable;
import rx.Observable.OnSubscribe;
import rx.Observer;
import rx.Producer;
import rx.Scheduler;
import rx.Subscriber;
import rx.functions.Action0;
import rx.internal.util.RxRingBuffer;
import rx.observers.TestSubscriber;
import rx.schedulers.Schedulers;
import rx.schedulers.TestScheduler;
import rx.subscriptions.CompositeSubscription;
public class OnSubscribeAmbTest {
private TestScheduler scheduler;
private Scheduler.Worker innerScheduler;
@Before
public void setUp() {
scheduler = new TestScheduler();
innerScheduler = scheduler.createWorker();
}
private Observable<String> createObservable(final String[] values,
final long interval, final Throwable e) {
return Observable.create(new OnSubscribe<String>() {
@Override
public void call(final Subscriber<? super String> subscriber) {
CompositeSubscription parentSubscription = new CompositeSubscription();
subscriber.add(parentSubscription);
long delay = interval;
for (final String value : values) {
parentSubscription.add(innerScheduler.schedule(new Action0() {
@Override
public void call() {
subscriber.onNext(value);
}
}, delay, TimeUnit.MILLISECONDS));
delay += interval;
}
parentSubscription.add(innerScheduler.schedule(new Action0() {
@Override
public void call() {
if (e == null) {
subscriber.onCompleted();
} else {
subscriber.onError(e);
}
}
}, delay, TimeUnit.MILLISECONDS));
}
});
}
@Test
public void testAmb() {
Observable<String> observable1 = createObservable(new String[] {
"1", "11", "111", "1111" }, 2000, null);
Observable<String> observable2 = createObservable(new String[] {
"2", "22", "222", "2222" }, 1000, null);
Observable<String> observable3 = createObservable(new String[] {
"3", "33", "333", "3333" }, 3000, null);
Observable<String> o = Observable.create(amb(observable1,
observable2, observable3));
@SuppressWarnings("unchecked")
Observer<String> observer = mock(Observer.class);
o.subscribe(observer);
scheduler.advanceTimeBy(100000, TimeUnit.MILLISECONDS);
InOrder inOrder = inOrder(observer);
inOrder.verify(observer, times(1)).onNext("2");
inOrder.verify(observer, times(1)).onNext("22");
inOrder.verify(observer, times(1)).onNext("222");
inOrder.verify(observer, times(1)).onNext("2222");
inOrder.verify(observer, times(1)).onCompleted();
inOrder.verifyNoMoreInteractions();
}
@Test
public void testAmb2() {
IOException expectedException = new IOException(
"fake exception");
Observable<String> observable1 = createObservable(new String[] {},
2000, new IOException("fake exception"));
Observable<String> observable2 = createObservable(new String[] {
"2", "22", "222", "2222" }, 1000, expectedException);
Observable<String> observable3 = createObservable(new String[] {},
3000, new IOException("fake exception"));
Observable<String> o = Observable.create(amb(observable1,
observable2, observable3));
@SuppressWarnings("unchecked")
Observer<String> observer = mock(Observer.class);
o.subscribe(observer);
scheduler.advanceTimeBy(100000, TimeUnit.MILLISECONDS);
InOrder inOrder = inOrder(observer);
inOrder.verify(observer, times(1)).onNext("2");
inOrder.verify(observer, times(1)).onNext("22");
inOrder.verify(observer, times(1)).onNext("222");
inOrder.verify(observer, times(1)).onNext("2222");
inOrder.verify(observer, times(1)).onError(expectedException);
inOrder.verifyNoMoreInteractions();
}
@Test
public void testAmb3() {
Observable<String> observable1 = createObservable(new String[] {
"1" }, 2000, null);
Observable<String> observable2 = createObservable(new String[] {},
1000, null);
Observable<String> observable3 = createObservable(new String[] {
"3" }, 3000, null);
Observable<String> o = Observable.create(amb(observable1,
observable2, observable3));
@SuppressWarnings("unchecked")
Observer<String> observer = mock(Observer.class);
o.subscribe(observer);
scheduler.advanceTimeBy(100000, TimeUnit.MILLISECONDS);
InOrder inOrder = inOrder(observer);
inOrder.verify(observer, times(1)).onCompleted();
inOrder.verifyNoMoreInteractions();
}
@Test
public void testProducerRequestThroughAmb() {
TestSubscriber<Integer> ts = new TestSubscriber<Integer>();
ts.requestMore(3);
final AtomicLong requested1 = new AtomicLong();
final AtomicLong requested2 = new AtomicLong();
Observable<Integer> o1 = Observable.create(new OnSubscribe<Integer>() {
@Override
public void call(Subscriber<? super Integer> s) {
s.setProducer(new Producer() {
@Override
public void request(long n) {
System.out.println("1-requested: " + n);
requested1.set(n);
}
});
}
});
Observable<Integer> o2 = Observable.create(new OnSubscribe<Integer>() {
@Override
public void call(Subscriber<? super Integer> s) {
s.setProducer(new Producer() {
@Override
public void request(long n) {
System.out.println("2-requested: " + n);
requested2.set(n);
}
});
}
});
Observable.amb(o1, o2).subscribe(ts);
assertEquals(3, requested1.get());
assertEquals(3, requested2.get());
}
@Test
public void testBackpressure() {
TestSubscriber<Integer> ts = new TestSubscriber<Integer>();
Observable.range(0, RxRingBuffer.SIZE * 2)
.ambWith(Observable.range(0, RxRingBuffer.SIZE * 2))
.observeOn(Schedulers.computation()) // observeOn has a backpressured RxRingBuffer
.delay(1, TimeUnit.MICROSECONDS) // make it a slightly slow consumer
.subscribe(ts);
ts.awaitTerminalEvent();
ts.assertNoErrors();
assertEquals(RxRingBuffer.SIZE * 2, ts.getOnNextEvents().size());
}
}