/**
* 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.any;
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.when;
import java.util.concurrent.CancellationException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.atomic.AtomicBoolean;
import org.junit.Test;
import rx.Observable;
import rx.Observer;
import rx.Subscription;
import rx.observers.TestObserver;
import rx.observers.TestSubscriber;
import rx.schedulers.Schedulers;
public class OnSubscribeToObservableFutureTest {
@Test
public void testSuccess() throws Exception {
@SuppressWarnings("unchecked")
Future<Object> future = mock(Future.class);
Object value = new Object();
when(future.get()).thenReturn(value);
@SuppressWarnings("unchecked")
Observer<Object> o = mock(Observer.class);
Subscription sub = Observable.from(future).subscribe(new TestObserver<Object>(o));
sub.unsubscribe();
verify(o, times(1)).onNext(value);
verify(o, times(1)).onCompleted();
verify(o, never()).onError(any(Throwable.class));
verify(future, times(1)).cancel(true);
}
@Test
public void testFailure() throws Exception {
@SuppressWarnings("unchecked")
Future<Object> future = mock(Future.class);
RuntimeException e = new RuntimeException();
when(future.get()).thenThrow(e);
@SuppressWarnings("unchecked")
Observer<Object> o = mock(Observer.class);
Subscription sub = Observable.from(future).subscribe(new TestObserver<Object>(o));
sub.unsubscribe();
verify(o, never()).onNext(null);
verify(o, never()).onCompleted();
verify(o, times(1)).onError(e);
verify(future, times(1)).cancel(true);
}
@Test
public void testCancelledBeforeSubscribe() throws Exception {
@SuppressWarnings("unchecked")
Future<Object> future = mock(Future.class);
CancellationException e = new CancellationException("unit test synthetic cancellation");
when(future.get()).thenThrow(e);
@SuppressWarnings("unchecked")
Observer<Object> o = mock(Observer.class);
TestSubscriber<Object> testSubscriber = new TestSubscriber<Object>(o);
testSubscriber.unsubscribe();
Subscription sub = Observable.from(future).subscribe(testSubscriber);
assertEquals(0, testSubscriber.getOnErrorEvents().size());
assertEquals(0, testSubscriber.getOnCompletedEvents().size());
}
@Test
public void testCancellationDuringFutureGet() throws Exception {
Future<Object> future = new Future<Object>() {
private AtomicBoolean isCancelled = new AtomicBoolean(false);
private AtomicBoolean isDone = new AtomicBoolean(false);
@Override
public boolean cancel(boolean mayInterruptIfRunning) {
isCancelled.compareAndSet(false, true);
return true;
}
@Override
public boolean isCancelled() {
return isCancelled.get();
}
@Override
public boolean isDone() {
return isCancelled() || isDone.get();
}
@Override
public Object get() throws InterruptedException, ExecutionException {
Thread.sleep(500);
isDone.compareAndSet(false, true);
return "foo";
}
@Override
public Object get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
return get();
}
};
@SuppressWarnings("unchecked")
Observer<Object> o = mock(Observer.class);
TestSubscriber<Object> testSubscriber = new TestSubscriber<Object>(o);
Observable<Object> futureObservable = Observable.from(future);
Subscription sub = futureObservable.subscribeOn(Schedulers.computation()).subscribe(testSubscriber);
sub.unsubscribe();
assertEquals(0, testSubscriber.getOnErrorEvents().size());
assertEquals(0, testSubscriber.getOnCompletedEvents().size());
assertEquals(0, testSubscriber.getOnNextEvents().size());
}
}