/**
* 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.never;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import java.util.HashMap;
import java.util.Map;
import java.util.NoSuchElementException;
import org.junit.Before;
import org.junit.Test;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;
import rx.Observable;
import rx.Observer;
import rx.Subscriber;
import rx.exceptions.OnErrorNotImplementedException;
import rx.functions.Action1;
import rx.functions.Func1;
import rx.functions.Func2;
import rx.internal.operators.OperatorMap;
import rx.schedulers.Schedulers;
public class OperatorMapTest {
@Mock
Observer<String> stringObserver;
@Mock
Observer<String> stringObserver2;
final static Func2<String, Integer, String> APPEND_INDEX = new Func2<String, Integer, String>() {
@Override
public String call(String value, Integer index) {
return value + index;
}
};
@Before
public void before() {
MockitoAnnotations.initMocks(this);
}
@Test
public void testMap() {
Map<String, String> m1 = getMap("One");
Map<String, String> m2 = getMap("Two");
Observable<Map<String, String>> observable = Observable.just(m1, m2);
Observable<String> m = observable.lift(new OperatorMap<Map<String, String>, String>(new Func1<Map<String, String>, String>() {
@Override
public String call(Map<String, String> map) {
return map.get("firstName");
}
}));
m.subscribe(stringObserver);
verify(stringObserver, never()).onError(any(Throwable.class));
verify(stringObserver, times(1)).onNext("OneFirst");
verify(stringObserver, times(1)).onNext("TwoFirst");
verify(stringObserver, times(1)).onCompleted();
}
@Test
public void testMapMany() {
/* simulate a top-level async call which returns IDs */
Observable<Integer> ids = Observable.just(1, 2);
/* now simulate the behavior to take those IDs and perform nested async calls based on them */
Observable<String> m = ids.flatMap(new Func1<Integer, Observable<String>>() {
@Override
public Observable<String> call(Integer id) {
/* simulate making a nested async call which creates another Observable */
Observable<Map<String, String>> subObservable = null;
if (id == 1) {
Map<String, String> m1 = getMap("One");
Map<String, String> m2 = getMap("Two");
subObservable = Observable.just(m1, m2);
} else {
Map<String, String> m3 = getMap("Three");
Map<String, String> m4 = getMap("Four");
subObservable = Observable.just(m3, m4);
}
/* simulate kicking off the async call and performing a select on it to transform the data */
return subObservable.map(new Func1<Map<String, String>, String>() {
@Override
public String call(Map<String, String> map) {
return map.get("firstName");
}
});
}
});
m.subscribe(stringObserver);
verify(stringObserver, never()).onError(any(Throwable.class));
verify(stringObserver, times(1)).onNext("OneFirst");
verify(stringObserver, times(1)).onNext("TwoFirst");
verify(stringObserver, times(1)).onNext("ThreeFirst");
verify(stringObserver, times(1)).onNext("FourFirst");
verify(stringObserver, times(1)).onCompleted();
}
@Test
public void testMapMany2() {
Map<String, String> m1 = getMap("One");
Map<String, String> m2 = getMap("Two");
Observable<Map<String, String>> observable1 = Observable.just(m1, m2);
Map<String, String> m3 = getMap("Three");
Map<String, String> m4 = getMap("Four");
Observable<Map<String, String>> observable2 = Observable.just(m3, m4);
Observable<Observable<Map<String, String>>> observable = Observable.just(observable1, observable2);
Observable<String> m = observable.flatMap(new Func1<Observable<Map<String, String>>, Observable<String>>() {
@Override
public Observable<String> call(Observable<Map<String, String>> o) {
return o.map(new Func1<Map<String, String>, String>() {
@Override
public String call(Map<String, String> map) {
return map.get("firstName");
}
});
}
});
m.subscribe(stringObserver);
verify(stringObserver, never()).onError(any(Throwable.class));
verify(stringObserver, times(1)).onNext("OneFirst");
verify(stringObserver, times(1)).onNext("TwoFirst");
verify(stringObserver, times(1)).onNext("ThreeFirst");
verify(stringObserver, times(1)).onNext("FourFirst");
verify(stringObserver, times(1)).onCompleted();
}
@Test
public void testMapWithError() {
Observable<String> w = Observable.just("one", "fail", "two", "three", "fail");
Observable<String> m = w.lift(new OperatorMap<String, String>(new Func1<String, String>() {
@Override
public String call(String s) {
if ("fail".equals(s)) {
throw new RuntimeException("Forced Failure");
}
return s;
}
})).doOnError(new Action1<Throwable>() {
@Override
public void call(Throwable t1) {
t1.printStackTrace();
}
});
m.subscribe(stringObserver);
verify(stringObserver, times(1)).onNext("one");
verify(stringObserver, never()).onNext("two");
verify(stringObserver, never()).onNext("three");
verify(stringObserver, never()).onCompleted();
verify(stringObserver, times(1)).onError(any(Throwable.class));
}
@Test(expected = IllegalArgumentException.class)
public void testMapWithIssue417() {
Observable.just(1).observeOn(Schedulers.computation())
.map(new Func1<Integer, Integer>() {
@Override
public Integer call(Integer arg0) {
throw new IllegalArgumentException("any error");
}
}).toBlocking().single();
}
@Test(expected = IllegalArgumentException.class)
public void testMapWithErrorInFuncAndThreadPoolScheduler() throws InterruptedException {
// The error will throw in one of threads in the thread pool.
// If map does not handle it, the error will disappear.
// so map needs to handle the error by itself.
Observable<String> m = Observable.just("one")
.observeOn(Schedulers.computation())
.map(new Func1<String, String>() {
@Override
public String call(String arg0) {
throw new IllegalArgumentException("any error");
}
});
// block for response, expecting exception thrown
m.toBlocking().last();
}
/**
* While mapping over range(1,0).last() we expect NoSuchElementException since the sequence is empty.
*/
@Test(expected = NoSuchElementException.class)
public void testErrorPassesThruMap() {
Observable.range(1, 0).last().map(new Func1<Integer, Integer>() {
@Override
public Integer call(Integer i) {
return i;
}
}).toBlocking().single();
}
/**
* We expect IllegalStateException to pass thru map.
*/
@Test(expected = IllegalStateException.class)
public void testErrorPassesThruMap2() {
Observable.error(new IllegalStateException()).map(new Func1<Object, Object>() {
@Override
public Object call(Object i) {
return i;
}
}).toBlocking().single();
}
/**
* We expect an ArithmeticException exception here because last() emits a single value
* but then we divide by 0.
*/
@Test(expected = ArithmeticException.class)
public void testMapWithErrorInFunc() {
Observable.range(1, 1).last().map(new Func1<Integer, Integer>() {
@Override
public Integer call(Integer i) {
return i / 0;
}
}).toBlocking().single();
}
@Test(expected = OnErrorNotImplementedException.class)
public void verifyExceptionIsThrownIfThereIsNoExceptionHandler() {
Observable.OnSubscribe<Object> creator = new Observable.OnSubscribe<Object>() {
@Override
public void call(Subscriber<? super Object> observer) {
observer.onNext("a");
observer.onNext("b");
observer.onNext("c");
observer.onCompleted();
}
};
Func1<Object, Observable<Object>> manyMapper = new Func1<Object, Observable<Object>>() {
@Override
public Observable<Object> call(Object object) {
return Observable.just(object);
}
};
Func1<Object, Object> mapper = new Func1<Object, Object>() {
private int count = 0;
@Override
public Object call(Object object) {
++count;
if (count > 2) {
throw new RuntimeException();
}
return object;
}
};
Action1<Object> onNext = new Action1<Object>() {
@Override
public void call(Object object) {
System.out.println(object.toString());
}
};
try {
Observable.create(creator).flatMap(manyMapper).map(mapper).subscribe(onNext);
} catch (RuntimeException e) {
e.printStackTrace();
throw e;
}
}
private static Map<String, String> getMap(String prefix) {
Map<String, String> m = new HashMap<String, String>();
m.put("firstName", prefix + "First");
m.put("lastName", prefix + "Last");
return m;
}
@Test(expected = OnErrorNotImplementedException.class)
public void testShouldNotSwallowOnErrorNotImplementedException() {
Observable.just("a", "b").flatMap(new Func1<String, Observable<String>>() {
@Override
public Observable<String> call(String s) {
return Observable.just(s + "1", s + "2");
}
}).flatMap(new Func1<String, Observable<String>>() {
@Override
public Observable<String> call(String s) {
return Observable.error(new Exception("test"));
}
}).forEach(new Action1<String>() {
@Override
public void call(String s) {
System.out.println(s);
}
});
}
}