/**
* 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.assertTrue;
import static org.mockito.Matchers.any;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import org.junit.Test;
import org.mockito.Mockito;
import rx.Observable;
import rx.Observer;
import rx.Subscriber;
import rx.internal.util.RxRingBuffer;
import rx.observers.TestSubscriber;
import rx.schedulers.Schedulers;
public class OnSubscribeFromIterableTest {
@Test(expected = NullPointerException.class)
public void testNull() {
Observable.create(new OnSubscribeFromIterable<String>(null));
}
@Test
public void testListIterable() {
Observable<String> observable = Observable.create(new OnSubscribeFromIterable<String>(Arrays.<String> asList("one", "two", "three")));
@SuppressWarnings("unchecked")
Observer<String> observer = mock(Observer.class);
observable.subscribe(observer);
verify(observer, times(1)).onNext("one");
verify(observer, times(1)).onNext("two");
verify(observer, times(1)).onNext("three");
verify(observer, Mockito.never()).onError(any(Throwable.class));
verify(observer, times(1)).onCompleted();
}
/**
* This tests the path that can not optimize based on size so must use setProducer.
*/
@Test
public void testRawIterable() {
Iterable<String> it = new Iterable<String>() {
@Override
public Iterator<String> iterator() {
return new Iterator<String>() {
int i = 0;
@Override
public boolean hasNext() {
return i++ < 3;
}
@Override
public String next() {
return String.valueOf(i);
}
@Override
public void remove() {
}
};
}
};
Observable<String> observable = Observable.create(new OnSubscribeFromIterable<String>(it));
@SuppressWarnings("unchecked")
Observer<String> observer = mock(Observer.class);
observable.subscribe(observer);
verify(observer, times(1)).onNext("1");
verify(observer, times(1)).onNext("2");
verify(observer, times(1)).onNext("3");
verify(observer, Mockito.never()).onError(any(Throwable.class));
verify(observer, times(1)).onCompleted();
}
@Test
public void testObservableFromIterable() {
Observable<String> observable = Observable.from(Arrays.<String> asList("one", "two", "three"));
@SuppressWarnings("unchecked")
Observer<String> observer = mock(Observer.class);
observable.subscribe(observer);
verify(observer, times(1)).onNext("one");
verify(observer, times(1)).onNext("two");
verify(observer, times(1)).onNext("three");
verify(observer, Mockito.never()).onError(any(Throwable.class));
verify(observer, times(1)).onCompleted();
}
@Test
public void testBackpressureViaRequest() {
ArrayList<Integer> list = new ArrayList<Integer>(RxRingBuffer.SIZE);
for (int i = 1; i <= RxRingBuffer.SIZE + 1; i++) {
list.add(i);
}
OnSubscribeFromIterable<Integer> o = new OnSubscribeFromIterable<Integer>(list);
TestSubscriber<Integer> ts = new TestSubscriber<Integer>();
ts.assertReceivedOnNext(Collections.<Integer> emptyList());
ts.requestMore(1);
o.call(ts);
ts.assertReceivedOnNext(Arrays.asList(1));
ts.requestMore(2);
ts.assertReceivedOnNext(Arrays.asList(1, 2, 3));
ts.requestMore(3);
ts.assertReceivedOnNext(Arrays.asList(1, 2, 3, 4, 5, 6));
ts.requestMore(list.size());
ts.assertTerminalEvent();
}
@Test
public void testNoBackpressure() {
OnSubscribeFromIterable<Integer> o = new OnSubscribeFromIterable<Integer>(Arrays.asList(1, 2, 3, 4, 5));
TestSubscriber<Integer> ts = new TestSubscriber<Integer>();
ts.assertReceivedOnNext(Collections.<Integer> emptyList());
ts.requestMore(Long.MAX_VALUE); // infinite
o.call(ts);
ts.assertReceivedOnNext(Arrays.asList(1, 2, 3, 4, 5));
ts.assertTerminalEvent();
}
@Test
public void testSubscribeMultipleTimes() {
OnSubscribeFromIterable<Integer> o = new OnSubscribeFromIterable<Integer>(Arrays.asList(1, 2, 3));
TestSubscriber<Integer> ts = new TestSubscriber<Integer>();
o.call(ts);
ts.assertReceivedOnNext(Arrays.asList(1, 2, 3));
ts = new TestSubscriber<Integer>();
o.call(ts);
ts.assertReceivedOnNext(Arrays.asList(1, 2, 3));
ts = new TestSubscriber<Integer>();
o.call(ts);
ts.assertReceivedOnNext(Arrays.asList(1, 2, 3));
}
@Test
public void testFromIterableRequestOverflow() throws InterruptedException {
Observable<Integer> o = Observable.from(Arrays.asList(1,2,3,4));
final int expectedCount = 4;
final CountDownLatch latch = new CountDownLatch(expectedCount);
o.subscribeOn(Schedulers.computation()).subscribe(new Subscriber<Integer>() {
@Override
public void onStart() {
request(2);
}
@Override
public void onCompleted() {
//ignore
}
@Override
public void onError(Throwable e) {
throw new RuntimeException(e);
}
@Override
public void onNext(Integer t) {
latch.countDown();
request(Long.MAX_VALUE-1);
}});
assertTrue(latch.await(10, TimeUnit.SECONDS));
}
}