/**
* Copyright (c) 2016-present, RxJava Contributors.
*
* 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 io.reactivex.internal.operators.flowable;
import static org.junit.Assert.fail;
import static org.mockito.Mockito.*;
import org.junit.Test;
import org.mockito.Mockito;
import org.reactivestreams.*;
import io.reactivex.*;
import io.reactivex.exceptions.TestException;
import io.reactivex.functions.Function;
import io.reactivex.internal.subscriptions.BooleanSubscription;
import io.reactivex.processors.PublishProcessor;
import io.reactivex.schedulers.Schedulers;
import io.reactivex.subscribers.TestSubscriber;
public class FlowableOnExceptionResumeNextViaFlowableTest {
@Test
public void testResumeNextWithException() {
// Trigger failure on second element
TestObservable f = new TestObservable("one", "EXCEPTION", "two", "three");
Flowable<String> w = Flowable.unsafeCreate(f);
Flowable<String> resume = Flowable.just("twoResume", "threeResume");
Flowable<String> observable = w.onExceptionResumeNext(resume);
Subscriber<String> observer = TestHelper.mockSubscriber();
observable.subscribe(observer);
try {
f.t.join();
} catch (InterruptedException e) {
fail(e.getMessage());
}
verify(observer).onSubscribe((Subscription)any());
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)).onComplete();
verifyNoMoreInteractions(observer);
}
@Test
public void testResumeNextWithRuntimeException() {
// Trigger failure on second element
TestObservable f = new TestObservable("one", "RUNTIMEEXCEPTION", "two", "three");
Flowable<String> w = Flowable.unsafeCreate(f);
Flowable<String> resume = Flowable.just("twoResume", "threeResume");
Flowable<String> observable = w.onExceptionResumeNext(resume);
Subscriber<String> observer = TestHelper.mockSubscriber();
observable.subscribe(observer);
try {
f.t.join();
} catch (InterruptedException e) {
fail(e.getMessage());
}
verify(observer).onSubscribe((Subscription)any());
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)).onComplete();
verifyNoMoreInteractions(observer);
}
@Test
public void testThrowablePassesThru() {
// Trigger failure on second element
TestObservable f = new TestObservable("one", "THROWABLE", "two", "three");
Flowable<String> w = Flowable.unsafeCreate(f);
Flowable<String> resume = Flowable.just("twoResume", "threeResume");
Flowable<String> observable = w.onExceptionResumeNext(resume);
Subscriber<String> observer = TestHelper.mockSubscriber();
observable.subscribe(observer);
try {
f.t.join();
} catch (InterruptedException e) {
fail(e.getMessage());
}
verify(observer).onSubscribe((Subscription)any());
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()).onComplete();
verifyNoMoreInteractions(observer);
}
@Test
public void testErrorPassesThru() {
// Trigger failure on second element
TestObservable f = new TestObservable("one", "ERROR", "two", "three");
Flowable<String> w = Flowable.unsafeCreate(f);
Flowable<String> resume = Flowable.just("twoResume", "threeResume");
Flowable<String> observable = w.onExceptionResumeNext(resume);
Subscriber<String> observer = TestHelper.mockSubscriber();
observable.subscribe(observer);
try {
f.t.join();
} catch (InterruptedException e) {
fail(e.getMessage());
}
verify(observer).onSubscribe((Subscription)any());
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()).onComplete();
verifyNoMoreInteractions(observer);
}
@Test
public void testMapResumeAsyncNext() {
// Trigger multiple failures
Flowable<String> w = Flowable.just("one", "fail", "two", "three", "fail");
// Resume Observable is async
TestObservable f = new TestObservable("twoResume", "threeResume");
Flowable<String> resume = Flowable.unsafeCreate(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 Function<String, String>() {
@Override
public String apply(String s) {
if ("fail".equals(s)) {
throw new RuntimeException("Forced Failure");
}
System.out.println("BadMapper:" + s);
return s;
}
});
Flowable<String> observable = w.onExceptionResumeNext(resume);
Subscriber<String> observer = TestHelper.mockSubscriber();
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)).onComplete();
}
@Test
public void testBackpressure() {
TestSubscriber<Integer> ts = new TestSubscriber<Integer>();
Flowable.range(0, 100000)
.onExceptionResumeNext(Flowable.just(1))
.observeOn(Schedulers.computation())
.map(new Function<Integer, Integer>() {
int c;
@Override
public Integer apply(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 Publisher<String> {
final String[] values;
Thread t;
TestObservable(String... values) {
this.values = values;
}
@Override
public void subscribe(final Subscriber<? super String> observer) {
observer.onSubscribe(new BooleanSubscription());
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 onComplete");
observer.onComplete();
} 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");
}
}
@Test
public void normalBackpressure() {
TestSubscriber<Integer> ts = TestSubscriber.create(0);
PublishProcessor<Integer> ps = PublishProcessor.create();
ps.onExceptionResumeNext(Flowable.range(3, 2)).subscribe(ts);
ts.request(2);
ps.onNext(1);
ps.onNext(2);
ps.onError(new TestException("Forced failure"));
ts.assertValues(1, 2);
ts.assertNoErrors();
ts.assertNotComplete();
ts.request(2);
ts.assertValues(1, 2, 3, 4);
ts.assertNoErrors();
ts.assertComplete();
}
}