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

src/test/java/io/reactivex/rxjava4/flowable/FlowableGroupByTests.java
81 строка3 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 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.FlowableEventStream.Event;
import io.reactivex.rxjava4.functions.Function;
import io.reactivex.rxjava4.subscribers.TestSubscriber;

public class FlowableGroupByTests extends RxJavaTest {

    @Test
    public void takeUnsubscribesOnGroupBy() {
        Flowable.mergeArray(
            FlowableEventStream.getEventStream("HTTP-ClusterA", 50),
            FlowableEventStream.getEventStream("HTTP-ClusterB", 20)
        )
        // group by type (2 clusters)
        .groupBy(event -> (Object) event.type())
        .take(1)
        .blockingForEach(v -> {
            System.out.println(v);
            v.take(1).subscribe();  // FIXME groups need consumption to a certain degree to cancel upstream
        });

        System.out.println("**** finished");
    }

    @Test
    public void takeUnsubscribesOnFlatMapOfGroupBy() {
        Flowable.mergeArray(
            FlowableEventStream.getEventStream("HTTP-ClusterA", 50),
            FlowableEventStream.getEventStream("HTTP-ClusterB", 20)
        )
        // group by type (2 clusters)
        .groupBy(event -> (Object) event.type())
        .flatMap((Function<GroupedFlowable<Object, Event>, Publisher<Object>>)
                g -> g.map(event -> event.instanceId() + " - " + event.values().get("count200")))
        .take(20)
        .blockingForEach(System.out::println);

        System.out.println("**** finished");
    }

    @Test
    public void groupsCompleteAsSoonAsMainCompletes() {
        TestSubscriber<Integer> ts = TestSubscriber.create();

        Flowable.range(0, 20)
        .groupBy(i -> i % 5)
        // need to prefetch as many groups as groupBy produces to avoid MBE
        .concatMap((Function<GroupedFlowable<Integer, Integer>, Flowable<Integer>>) v -> v, new StandardBufferedConfig(20))
        .subscribe(ts);

        // Behavior change: this now counts as group abandonment because concatMap
        // doesn't subscribe to the 2nd+ emitted groups immediately
        ts.assertValues(
                0, 5, 10, 15, // First group is okay
                // any other group gets abandoned so we get 16 one-element group
                1, 2, 3, 4, 6, 7, 8, 9, 11, 12, 13, 14, 16, 17, 18, 19
                );
        ts.assertComplete();
        ts.assertNoErrors();
    }
}