/**
* 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.fail;
import static org.mockito.Matchers.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.verifyNoMoreInteractions;
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 OperatorOnExceptionResumeNextViaObservableTest {
@Test
public void testResumeNextWithException() {
// Trigger failure on second element
TestObservable f = new TestObservable("one", "EXCEPTION", "two", "three");
Observable<String> w = Observable.create(f);
Observable<String> resume = Observable.just("twoResume", "threeResume");
Observable<String> observable = w.onExceptionResumeNext(resume);
@SuppressWarnings("unchecked")
Observer<String> observer = mock(Observer.class);
observable.subscribe(observer);
try {
f.t.join();
} catch (InterruptedException e) {
fail(e.getMessage());
}
verify(observer, times(1)).onNext("one");
verify(observer, Mockito.never()).onNext("two");
verify(observer, Mockito.never()).onNext("three");
verify(observer, times(1)).onNext("twoResume");
verify(observer, times(1)).onNext("threeResume");
verify(observer, Mockito.never()).onError(any(Throwable.class));
verify(observer, times(1)).onCompleted();
verifyNoMoreInteractions(observer);
}
@Test
public void testResumeNextWithRuntimeException() {
// Trigger failure on second element
TestObservable f = new TestObservable("one", "RUNTIMEEXCEPTION", "two", "three");
Observable<String> w = Observable.create(f);
Observable<String> resume = Observable.just("twoResume", "threeResume");
Observable<String> observable = w.onExceptionResumeNext(resume);
@SuppressWarnings("unchecked")
Observer<String> observer = mock(Observer.class);
observable.subscribe(observer);
try {
f.t.join();
} catch (InterruptedException e) {
fail(e.getMessage());
}
verify(observer, times(1)).onNext("one");
verify(observer, Mockito.never()).onNext("two");
verify(observer, Mockito.never()).onNext("three");
verify(observer, times(1)).onNext("twoResume");
verify(observer, times(1)).onNext("threeResume");
verify(observer, Mockito.never()).onError(any(Throwable.class));
verify(observer, times(1)).onCompleted();
verifyNoMoreInteractions(observer);
}
@Test
public void testThrowablePassesThru() {
// Trigger failure on second element
TestObservable f = new TestObservable("one", "THROWABLE", "two", "three");
Observable<String> w = Observable.create(f);
Observable<String> resume = Observable.just("twoResume", "threeResume");
Observable<String> observable = w.onExceptionResumeNext(resume);
@SuppressWarnings("unchecked")
Observer<String> observer = mock(Observer.class);
observable.subscribe(observer);
try {
f.t.join();
} catch (InterruptedException e) {
fail(e.getMessage());
}
verify(observer, times(1)).onNext("one");
verify(observer, never()).onNext("two");
verify(observer, never()).onNext("three");
verify(observer, never()).onNext("twoResume");
verify(observer, never()).onNext("threeResume");
verify(observer, times(1)).onError(any(Throwable.class));
verify(observer, never()).onCompleted();
verifyNoMoreInteractions(observer);
}
@Test
public void testErrorPassesThru() {
// Trigger failure on second element
TestObservable f = new TestObservable("one", "ERROR", "two", "three");
Observable<String> w = Observable.create(f);
Observable<String> resume = Observable.just("twoResume", "threeResume");
Observable<String> observable = w.onExceptionResumeNext(resume);
@SuppressWarnings("unchecked")
Observer<String> observer = mock(Observer.class);
observable.subscribe(observer);
try {
f.t.join();
} catch (InterruptedException e) {
fail(e.getMessage());
}
verify(observer, times(1)).onNext("one");
verify(observer, never()).onNext("two");
verify(observer, never()).onNext("three");
verify(observer, never()).onNext("twoResume");
verify(observer, never()).onNext("threeResume");
verify(observer, times(1)).onError(any(Throwable.class));
verify(observer, never()).onCompleted();
verifyNoMoreInteractions(observer);
}
@Test
public void testMapResumeAsyncNext() {
// Trigger multiple failures
Observable<String> w = Observable.just("one", "fail", "two", "three", "fail");
// Resume Observable is async
TestObservable f = new TestObservable("twoResume", "threeResume");
Observable<String> resume = Observable.create(f);
// 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.onExceptionResumeNext(resume);
@SuppressWarnings("unchecked")
Observer<String> observer = mock(Observer.class);
observable.subscribe(observer);
try {
// if the thread gets started (which it shouldn't if it's working correctly)
if (f.t != null) {
f.t.join();
}
} catch (InterruptedException e) {
fail(e.getMessage());
}
verify(observer, times(1)).onNext("one");
verify(observer, never()).onNext("two");
verify(observer, never()).onNext("three");
verify(observer, times(1)).onNext("twoResume");
verify(observer, times(1)).onNext("threeResume");
verify(observer, Mockito.never()).onError(any(Throwable.class));
verify(observer, times(1)).onCompleted();
}
@Test
public void testBackpressure() {
TestSubscriber<Integer> ts = new TestSubscriber<Integer>();
Observable.range(0, 100000)
.onExceptionResumeNext(Observable.just(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> observer) {
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) {
if ("EXCEPTION".equals(s))
throw new Exception("Forced Exception");
else if ("RUNTIMEEXCEPTION".equals(s))
throw new RuntimeException("Forced RuntimeException");
else if ("ERROR".equals(s))
throw new Error("Forced Error");
else if ("THROWABLE".equals(s))
throw new Throwable("Forced Throwable");
System.out.println("TestObservable onNext: " + s);
observer.onNext(s);
}
System.out.println("TestObservable onCompleted");
observer.onCompleted();
} catch (Throwable e) {
System.out.println("TestObservable onError: " + e);
observer.onError(e);
}
}
});
System.out.println("starting TestObservable thread");
t.start();
System.out.println("done starting TestObservable thread");
}
}
}