/**
* 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.assertNotNull;
import static org.junit.Assert.fail;
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.atomic.AtomicReference;
import org.junit.Test;
import org.mockito.Mockito;
import rx.Observable;
import rx.Observer;
import rx.Subscriber;
import rx.functions.Func1;
import rx.observers.TestSubscriber;
import rx.schedulers.Schedulers;
public class OperatorOnErrorReturnTest {
@Test
public void testResumeNext() {
TestObservable f = new TestObservable("one");
Observable<String> w = Observable.create(f);
final AtomicReference<Throwable> capturedException = new AtomicReference<Throwable>();
Observable<String> observable = w.onErrorReturn(new Func1<Throwable, String>() {
@Override
public String call(Throwable e) {
capturedException.set(e);
return "failure";
}
});
@SuppressWarnings("unchecked")
Observer<String> observer = mock(Observer.class);
observable.subscribe(observer);
try {
f.t.join();
} catch (InterruptedException e) {
fail(e.getMessage());
}
verify(observer, Mockito.never()).onError(any(Throwable.class));
verify(observer, times(1)).onCompleted();
verify(observer, times(1)).onNext("one");
verify(observer, times(1)).onNext("failure");
assertNotNull(capturedException.get());
}
/**
* Test that when a function throws an exception this is propagated through onError
*/
@Test
public void testFunctionThrowsError() {
TestObservable f = new TestObservable("one");
Observable<String> w = Observable.create(f);
final AtomicReference<Throwable> capturedException = new AtomicReference<Throwable>();
Observable<String> observable = w.onErrorReturn(new Func1<Throwable, String>() {
@Override
public String call(Throwable e) {
capturedException.set(e);
throw new RuntimeException("exception from function");
}
});
@SuppressWarnings("unchecked")
Observer<String> observer = mock(Observer.class);
observable.subscribe(observer);
try {
f.t.join();
} catch (InterruptedException e) {
fail(e.getMessage());
}
// we should get the "one" value before the error
verify(observer, times(1)).onNext("one");
// we should have received an onError call on the Observer since the resume function threw an exception
verify(observer, times(1)).onError(any(Throwable.class));
verify(observer, times(0)).onCompleted();
assertNotNull(capturedException.get());
}
@Test
public void testMapResumeAsyncNext() {
// Trigger multiple failures
Observable<String> w = Observable.just("one", "fail", "two", "three", "fail");
// Introduce map function that fails intermittently (Map does not prevent this when the observer is a
// rx.operator incl onErrorResumeNextViaObservable)
w = w.map(new Func1<String, String>() {
@Override
public String call(String s) {
if ("fail".equals(s))
throw new RuntimeException("Forced Failure");
System.out.println("BadMapper:" + s);
return s;
}
});
Observable<String> observable = w.onErrorReturn(new Func1<Throwable, String>() {
@Override
public String call(Throwable t1) {
return "resume";
}
});
@SuppressWarnings("unchecked")
Observer<String> observer = mock(Observer.class);
TestSubscriber<String> ts = new TestSubscriber<String>(observer);
observable.subscribe(ts);
ts.awaitTerminalEvent();
verify(observer, Mockito.never()).onError(any(Throwable.class));
verify(observer, times(1)).onCompleted();
verify(observer, times(1)).onNext("one");
verify(observer, Mockito.never()).onNext("two");
verify(observer, Mockito.never()).onNext("three");
verify(observer, times(1)).onNext("resume");
}
@Test
public void testBackpressure() {
TestSubscriber<Integer> ts = new TestSubscriber<Integer>();
Observable.range(0, 100000)
.onErrorReturn(new Func1<Throwable, Integer>() {
@Override
public Integer call(Throwable t1) {
return 1;
}
})
.observeOn(Schedulers.computation())
.map(new Func1<Integer, Integer>() {
int c = 0;
@Override
public Integer call(Integer t1) {
if (c++ <= 1) {
// slow
try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
return t1;
}
})
.subscribe(ts);
ts.awaitTerminalEvent();
ts.assertNoErrors();
}
private static class TestObservable implements Observable.OnSubscribe<String> {
final String[] values;
Thread t = null;
public TestObservable(String... values) {
this.values = values;
}
@Override
public void call(final Subscriber<? super String> subscriber) {
System.out.println("TestObservable subscribed to ...");
t = new Thread(new Runnable() {
@Override
public void run() {
try {
System.out.println("running TestObservable thread");
for (String s : values) {
System.out.println("TestObservable onNext: " + s);
subscriber.onNext(s);
}
throw new RuntimeException("Forced Failure");
} catch (Throwable e) {
subscriber.onError(e);
}
}
});
System.out.println("starting TestObservable thread");
t.start();
System.out.println("done starting TestObservable thread");
}
}
}