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RefCountTests.java
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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;
import static org.junit.Assert.assertEquals;
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.verify;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import org.junit.Before;
import org.junit.Test;
import org.mockito.InOrder;
import org.mockito.MockitoAnnotations;
import rx.Observable.OnSubscribe;
import rx.functions.Action0;
import rx.functions.Action1;
import rx.functions.Func2;
import rx.observers.Subscribers;
import rx.observers.TestSubscriber;
import rx.schedulers.TestScheduler;
import rx.subjects.ReplaySubject;
import rx.subscriptions.Subscriptions;
public class RefCountTests {
@Before
public void setUp() {
MockitoAnnotations.initMocks(this);
}
@Test
public void onlyFirstShouldSubscribeAndLastUnsubscribe() {
final AtomicInteger subscriptionCount = new AtomicInteger();
final AtomicInteger unsubscriptionCount = new AtomicInteger();
Observable<Integer> observable = Observable.create(new OnSubscribe<Integer>() {
@Override
public void call(Subscriber<? super Integer> observer) {
subscriptionCount.incrementAndGet();
observer.add(Subscriptions.create(new Action0() {
@Override
public void call() {
unsubscriptionCount.incrementAndGet();
}
}));
}
});
Observable<Integer> refCounted = observable.publish().refCount();
@SuppressWarnings("unchecked")
Observer<Integer> observer = mock(Observer.class);
Subscription first = refCounted.subscribe(observer);
assertEquals(1, subscriptionCount.get());
Subscription second = refCounted.subscribe(observer);
assertEquals(1, subscriptionCount.get());
first.unsubscribe();
assertEquals(0, unsubscriptionCount.get());
second.unsubscribe();
assertEquals(1, unsubscriptionCount.get());
}
@Test
public void testRefCount() {
TestScheduler s = new TestScheduler();
Observable<Long> interval = Observable.interval(100, TimeUnit.MILLISECONDS, s).publish().refCount();
// subscribe list1
final List<Long> list1 = new ArrayList<Long>();
Subscription s1 = interval.subscribe(new Action1<Long>() {
@Override
public void call(Long t1) {
list1.add(t1);
}
});
s.advanceTimeBy(200, TimeUnit.MILLISECONDS);
assertEquals(2, list1.size());
assertEquals(0L, list1.get(0).longValue());
assertEquals(1L, list1.get(1).longValue());
// subscribe list2
final List<Long> list2 = new ArrayList<Long>();
Subscription s2 = interval.subscribe(new Action1<Long>() {
@Override
public void call(Long t1) {
list2.add(t1);
}
});
s.advanceTimeBy(300, TimeUnit.MILLISECONDS);
// list 1 should have 5 items
assertEquals(5, list1.size());
assertEquals(2L, list1.get(2).longValue());
assertEquals(3L, list1.get(3).longValue());
assertEquals(4L, list1.get(4).longValue());
// list 2 should only have 3 items
assertEquals(3, list2.size());
assertEquals(2L, list2.get(0).longValue());
assertEquals(3L, list2.get(1).longValue());
assertEquals(4L, list2.get(2).longValue());
// unsubscribe list1
s1.unsubscribe();
// advance further
s.advanceTimeBy(300, TimeUnit.MILLISECONDS);
// list 1 should still have 5 items
assertEquals(5, list1.size());
// list 2 should have 6 items
assertEquals(6, list2.size());
assertEquals(5L, list2.get(3).longValue());
assertEquals(6L, list2.get(4).longValue());
assertEquals(7L, list2.get(5).longValue());
// unsubscribe list2
s2.unsubscribe();
// advance further
s.advanceTimeBy(1000, TimeUnit.MILLISECONDS);
// subscribing a new one should start over because the source should have been unsubscribed
// subscribe list3
final List<Long> list3 = new ArrayList<Long>();
interval.subscribe(new Action1<Long>() {
@Override
public void call(Long t1) {
list3.add(t1);
}
});
s.advanceTimeBy(200, TimeUnit.MILLISECONDS);
assertEquals(2, list3.size());
assertEquals(0L, list3.get(0).longValue());
assertEquals(1L, list3.get(1).longValue());
}
@Test
public void testAlreadyUnsubscribedClient() {
Subscriber<Integer> done = Subscribers.empty();
done.unsubscribe();
@SuppressWarnings("unchecked")
Observer<Integer> o = mock(Observer.class);
Observable<Integer> result = Observable.just(1).publish().refCount();
result.subscribe(done);
result.subscribe(o);
verify(o).onNext(1);
verify(o).onCompleted();
verify(o, never()).onError(any(Throwable.class));
}
@Test
public void testAlreadyUnsubscribedInterleavesWithClient() {
ReplaySubject<Integer> source = ReplaySubject.create();
Subscriber<Integer> done = Subscribers.empty();
done.unsubscribe();
@SuppressWarnings("unchecked")
Observer<Integer> o = mock(Observer.class);
InOrder inOrder = inOrder(o);
Observable<Integer> result = source.publish().refCount();
result.subscribe(o);
source.onNext(1);
result.subscribe(done);
source.onNext(2);
source.onCompleted();
inOrder.verify(o).onNext(1);
inOrder.verify(o).onNext(2);
inOrder.verify(o).onCompleted();
verify(o, never()).onError(any(Throwable.class));
}
@Test
public void testConnectDisconnectConnectAndSubjectState() {
Observable<Integer> o1 = Observable.just(10);
Observable<Integer> o2 = Observable.just(20);
Observable<Integer> combined = Observable.combineLatest(o1, o2, new Func2<Integer, Integer, Integer>() {
@Override
public Integer call(Integer t1, Integer t2) {
return t1 + t2;
}
}).publish().refCount();
TestSubscriber<Integer> ts1 = new TestSubscriber<Integer>();
TestSubscriber<Integer> ts2 = new TestSubscriber<Integer>();
combined.subscribe(ts1);
combined.subscribe(ts2);
ts1.assertTerminalEvent();
ts1.assertNoErrors();
ts1.assertReceivedOnNext(Arrays.asList(30));
ts2.assertTerminalEvent();
ts2.assertNoErrors();
ts2.assertReceivedOnNext(Arrays.asList(30));
}
}