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/**
* 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;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertSame;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.NoSuchElementException;
import org.junit.Test;
import rx.CovarianceTest.CoolRating;
import rx.CovarianceTest.ExtendedResult;
import rx.CovarianceTest.HorrorMovie;
import rx.CovarianceTest.Media;
import rx.CovarianceTest.Movie;
import rx.CovarianceTest.Rating;
import rx.CovarianceTest.Result;
import rx.EventStream.Event;
import rx.functions.Action1;
import rx.functions.Func1;
import rx.functions.Func2;
import rx.functions.FuncN;
import rx.observables.GroupedObservable;
public class ZipTests {
@Test
public void testZipObservableOfObservables() {
EventStream.getEventStream("HTTP-ClusterB", 20)
.groupBy(new Func1<Event, String>() {
@Override
public String call(Event e) {
return e.instanceId;
}
// now we have streams of cluster+instanceId
}).flatMap(new Func1<GroupedObservable<String, Event>, Observable<Map<String, String>>>() {
@Override
public Observable<Map<String, String>> call(final GroupedObservable<String, Event> ge) {
return ge.scan(new HashMap<String, String>(), new Func2<Map<String, String>, Event, Map<String, String>>() {
@Override
public Map<String, String> call(Map<String, String> accum, Event perInstanceEvent) {
accum.put("instance", ge.getKey());
return accum;
}
});
}
})
.take(10)
.toBlocking().forEach(new Action1<Map<String, String>>() {
@Override
public void call(Map<String, String> v) {
System.out.println(v);
}
});
System.out.println("**** finished");
}
/**
* This won't compile if super/extends isn't done correctly on generics
*/
@Test
public void testCovarianceOfZip() {
Observable<HorrorMovie> horrors = Observable.from(new HorrorMovie());
Observable<CoolRating> ratings = Observable.from(new CoolRating());
Observable.<Movie, CoolRating, Result> zip(horrors, ratings, combine).toBlocking().forEach(action);
Observable.<Movie, CoolRating, Result> zip(horrors, ratings, combine).toBlocking().forEach(action);
Observable.<Media, Rating, ExtendedResult> zip(horrors, ratings, combine).toBlocking().forEach(extendedAction);
Observable.<Media, Rating, Result> zip(horrors, ratings, combine).toBlocking().forEach(action);
Observable.<Media, Rating, ExtendedResult> zip(horrors, ratings, combine).toBlocking().forEach(action);
Observable.<Movie, CoolRating, Result> zip(horrors, ratings, combine);
}
/**
* Occasionally zip may be invoked with 0 observables. Test that we don't block indefinitely instead
* of immediately invoking zip with 0 argument.
*
* We now expect an NoSuchElementException since last() requires at least one value and nothing will be emitted.
*/
@Test(expected = NoSuchElementException.class)
public void nonBlockingObservable() {
final Object invoked = new Object();
Collection<Observable<Object>> observables = Collections.emptyList();
Observable<Object> result = Observable.zip(observables, new FuncN<Object>() {
@Override
public Object call(final Object... args) {
System.out.println("received: " + args);
assertEquals("No argument should have been passed", 0, args.length);
return invoked;
}
});
assertSame(invoked, result.toBlocking().last());
}
Func2<Media, Rating, ExtendedResult> combine = new Func2<Media, Rating, ExtendedResult>() {
@Override
public ExtendedResult call(Media m, Rating r) {
return new ExtendedResult();
}
};
Action1<Result> action = new Action1<Result>() {
@Override
public void call(Result t1) {
System.out.println("Result: " + t1);
}
};
Action1<ExtendedResult> extendedAction = new Action1<ExtendedResult>() {
@Override
public void call(ExtendedResult t1) {
System.out.println("Result: " + t1);
}
};
}