/**
* 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.mockito.Matchers.any;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import java.util.concurrent.CountDownLatch;
import org.junit.Test;
import org.mockito.Mockito;
import rx.Observable;
import rx.Observer;
import rx.functions.Func1;
import rx.internal.util.RxRingBuffer;
import rx.observers.TestSubscriber;
public class OperatorFilterTest {
@Test
public void testFilter() {
Observable<String> w = Observable.just("one", "two", "three");
Observable<String> observable = w.filter(new Func1<String, Boolean>() {
@Override
public Boolean call(String t1) {
return t1.equals("two");
}
});
@SuppressWarnings("unchecked")
Observer<String> observer = mock(Observer.class);
observable.subscribe(observer);
verify(observer, Mockito.never()).onNext("one");
verify(observer, times(1)).onNext("two");
verify(observer, Mockito.never()).onNext("three");
verify(observer, Mockito.never()).onError(any(Throwable.class));
verify(observer, times(1)).onCompleted();
}
/**
* Make sure we are adjusting subscriber.request() for filtered items
*/
@Test(timeout = 500)
public void testWithBackpressure() throws InterruptedException {
Observable<String> w = Observable.just("one", "two", "three");
Observable<String> o = w.filter(new Func1<String, Boolean>() {
@Override
public Boolean call(String t1) {
return t1.equals("three");
}
});
final CountDownLatch latch = new CountDownLatch(1);
TestSubscriber<String> ts = new TestSubscriber<String>() {
@Override
public void onCompleted() {
System.out.println("onCompleted");
latch.countDown();
}
@Override
public void onError(Throwable e) {
e.printStackTrace();
latch.countDown();
}
@Override
public void onNext(String t) {
System.out.println("Received: " + t);
// request more each time we receive
request(1);
}
};
// this means it will only request "one" and "two", expecting to receive them before requesting more
ts.requestMore(2);
o.subscribe(ts);
// this will wait forever unless OperatorTake handles the request(n) on filtered items
latch.await();
}
/**
* Make sure we are adjusting subscriber.request() for filtered items
*/
@Test(timeout = 500000)
public void testWithBackpressure2() throws InterruptedException {
Observable<Integer> w = Observable.range(1, RxRingBuffer.SIZE * 2);
Observable<Integer> o = w.filter(new Func1<Integer, Boolean>() {
@Override
public Boolean call(Integer t1) {
return t1 > 100;
}
});
final CountDownLatch latch = new CountDownLatch(1);
final TestSubscriber<Integer> ts = new TestSubscriber<Integer>() {
@Override
public void onCompleted() {
System.out.println("onCompleted");
latch.countDown();
}
@Override
public void onError(Throwable e) {
e.printStackTrace();
latch.countDown();
}
@Override
public void onNext(Integer t) {
System.out.println("Received: " + t);
// request more each time we receive
request(1);
}
};
// this means it will only request 1 item and expect to receive more
ts.requestMore(1);
o.subscribe(ts);
// this will wait forever unless OperatorTake handles the request(n) on filtered items
latch.await();
}
}