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 2.x

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RxVsStreamPerf.java

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/**

* 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;

import java.util.List;

import java.util.concurrent.TimeUnit;

import org.openjdk.jmh.annotations.*;

import org.openjdk.jmh.infra.Blackhole;

import org.reactivestreams.Publisher;

import io.reactivex.functions.Function;

@BenchmarkMode(Mode.Throughput)

@Warmup(iterations = 5)

@Measurement(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)

@OutputTimeUnit(TimeUnit.SECONDS)

@Fork(value = 1)

@State(Scope.Thread)

public class RxVsStreamPerf {

@Param({ "1", "1000", "1000000" })

public int times;

Flowable<Integer> range;

Observable<Integer> rangeObservable;

Flowable<Integer> rangeFlatMap;

Observable<Integer> rangeObservableFlatMap;

Flowable<Integer> rangeFlatMapJust;

Observable<Integer> rangeObservableFlatMapJust;

List<Integer> values;

@Setup

public void setup() {

range = Flowable.range(1, times);

rangeFlatMapJust = range.flatMap(new Function<Integer, Publisher<Integer>>() {

@Override

public Publisher<Integer> apply(Integer v) {

return Flowable.just(v);

}

});

rangeFlatMap = range.flatMap(new Function<Integer, Publisher<Integer>>() {

@Override

public Publisher<Integer> apply(Integer v) {

return Flowable.range(v, 2);

}

});

rangeObservable = Observable.range(1, times);

rangeObservableFlatMapJust = rangeObservable.flatMap(new Function<Integer, Observable<Integer>>() {

@Override

public Observable<Integer> apply(Integer v) {

return Observable.just(v);

}

});

rangeObservableFlatMap = rangeObservable.flatMap(new Function<Integer, Observable<Integer>>() {

@Override

public Observable<Integer> apply(Integer v) {

return Observable.range(v, 2);

}

});

values = range.toList().blockingGet();

}

@Benchmark

public void range(Blackhole bh) {

range.subscribe(new PerfSubscriber(bh));

}

@Benchmark

public void rangeObservable(Blackhole bh) {

rangeObservable.subscribe(new PerfObserver(bh));

}

@Benchmark

public void rangeFlatMap(Blackhole bh) {

rangeFlatMap.subscribe(new PerfSubscriber(bh));

}

@Benchmark

public void rangeObservableFlatMap(Blackhole bh) {

rangeObservableFlatMap.subscribe(new PerfObserver(bh));

}

@Benchmark

public void rangeFlatMapJust(Blackhole bh) {

rangeFlatMapJust.subscribe(new PerfSubscriber(bh));

}

@Benchmark

public void rangeObservableFlatMapJust(Blackhole bh) {

rangeObservableFlatMapJust.subscribe(new PerfObserver(bh));

}

}