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ZipTests.java
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/**
* Copyright 2016 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 io.reactivex;
import static org.junit.Assert.*;
import java.util.*;
import org.junit.Test;
import org.reactivestreams.Publisher;
import io.reactivex.Observable;
import io.reactivex.CovarianceTest.*;
import io.reactivex.EventStream.Event;
import io.reactivex.functions.*;
import io.reactivex.observables.GroupedObservable;
public class ZipTests {
@Test
public void testZipObservableOfObservables() {
EventStream.getEventStream("HTTP-ClusterB", 20)
.groupBy(new Function<Event, String>() {
@Override
public String apply(Event e) {
return e.instanceId;
}
})
// now we have streams of cluster+instanceId
.flatMap(new Function<GroupedObservable<String, Event>, Publisher<HashMap<String, String>>>() {
@Override
public Publisher<HashMap<String, String>> apply(final GroupedObservable<String, Event> ge) {
return ge.scan(new HashMap<String, String>(), new BiFunction<HashMap<String, String>, Event, HashMap<String, String>>() {
@Override
public HashMap<String, String> apply(HashMap<String, String> accum,
Event perInstanceEvent) {
accum.put("instance", ge.key());
return accum;
}
});
}
})
.take(10)
.toBlocking().forEach(new Consumer<HashMap<String, String>>() {
@Override
public void accept(HashMap<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.just(new HorrorMovie());
Observable<CoolRating> ratings = Observable.just(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 Function<Object[], Object>() {
@Override
public Object apply(Object[] args) {
System.out.println("received: " + args);
assertEquals("No argument should have been passed", 0, args.length);
return invoked;
}
});
assertSame(invoked, result.toBlocking().last());
}
BiFunction<Media, Rating, ExtendedResult> combine = new BiFunction<Media, Rating, ExtendedResult>() {
@Override
public ExtendedResult apply(Media m, Rating r) {
return new ExtendedResult();
}
};
Consumer<Result> action = new Consumer<Result>() {
@Override
public void accept(Result t1) {
System.out.println("Result: " + t1);
}
};
Consumer<ExtendedResult> extendedAction = new Consumer<ExtendedResult>() {
@Override
public void accept(ExtendedResult t1) {
System.out.println("Result: " + t1);
}
};
}