src/test/java/io/reactivex/rxjava4/flowable/FlowableZipTests.java - 4.x - githubmirror/RxJava

src/test/java/io/reactivex/rxjava4/flowable/FlowableZipTests.java
114 строк4 KB
David Karnok
4.x: Streamable + takeUntil + groupBy + refactor + helpers (#8215)
05 июл 2026, 01:45
05 июл 2026, 01:45580b39c
/*
 * 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.rxjava4.flowable;

import static org.junit.jupiter.api.Assertions.*;

import java.util.*;
import java.util.concurrent.Flow.Publisher;

import org.junit.jupiter.api.Test;

import io.reactivex.rxjava4.core.*;
import io.reactivex.rxjava4.core.config.StandardBufferedConfig;
import io.reactivex.rxjava4.flowable.FlowableCovarianceTest.*;
import io.reactivex.rxjava4.flowable.FlowableEventStream.Event;
import io.reactivex.rxjava4.functions.*;

public class FlowableZipTests extends RxJavaTest {

    @Test
    public void zipObservableOfObservables() {
        FlowableEventStream.getEventStream("HTTP-ClusterB", 20)
                .groupBy(Event::instanceId)
                // now we have streams of cluster+instanceId
                .flatMap((Function<GroupedFlowable<String, Event>, Publisher<HashMap<String, String>>>) ge -> ge.scan(new HashMap<>(), (accum, _) -> {
                     synchronized (accum) {
                         accum.put("instance", ge.getKey());
                     }
                     return accum;
                  }))
                .take(10)
                .blockingForEach(v -> {
                    synchronized (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 covarianceOfZip() {
        Flowable<HorrorMovie> horrors = Flowable.just(new HorrorMovie());
        Flowable<CoolRating> ratings = Flowable.just(new CoolRating());

        Flowable.<Movie, CoolRating, Result> zip(horrors, ratings, combine).blockingForEach(action);
        Flowable.<Movie, CoolRating, Result> zip(horrors, ratings, combine).blockingForEach(action);
        Flowable.<Media, Rating, ExtendedResult> zip(horrors, ratings, combine).blockingForEach(extendedAction);
        Flowable.<Media, Rating, Result> zip(horrors, ratings, combine).blockingForEach(action);
        Flowable.<Media, Rating, ExtendedResult> zip(horrors, ratings, combine).blockingForEach(action);

        Flowable.<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
    public void nonBlockingObservable() {
        assertThrows(NoSuchElementException.class, () -> {
            final Object invoked = new Object();

            Collection<Flowable<Object>> observables = Collections.emptyList();

            Flowable<Object> result = Flowable.zip(observables, args -> {
                System.out.println("received: " + args);
                assertEquals(0, args.length, "No argument should have been passed");
                return invoked;
            });

            assertSame(invoked, result.blockingLast());
        });

    }

    BiFunction<Media, Rating, ExtendedResult> combine = (_, _) -> new ExtendedResult();

    Consumer<Result> action = t1 -> System.out.println("Result: " + t1);

    Consumer<ExtendedResult> extendedAction = t1 -> System.out.println("Result: " + t1);

    @Test
    public void zipWithDelayError() {
        Flowable.just(1)
        .zipWith(Flowable.just(2), Integer::sum, new StandardBufferedConfig(true))
        .test()
        .assertResult(3);
    }

    @Test
    public void zipWithDelayErrorBufferSize() {
        Flowable.just(1)
        .zipWith(Flowable.just(2), Integer::sum, new StandardBufferedConfig(true, 16))
        .test()
        .assertResult(3);
    }
}