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OperatorFlatMapPerf.java

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 1.x

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OperatorFlatMapPerf.java

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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.operators;

import java.util.concurrent.TimeUnit;

import org.openjdk.jmh.annotations.Benchmark;

import org.openjdk.jmh.annotations.BenchmarkMode;

import org.openjdk.jmh.annotations.Mode;

import org.openjdk.jmh.annotations.OutputTimeUnit;

import org.openjdk.jmh.annotations.Param;

import org.openjdk.jmh.annotations.Scope;

import org.openjdk.jmh.annotations.State;

import rx.Observable;

import rx.functions.Func1;

import rx.jmh.InputWithIncrementingInteger;

import rx.jmh.LatchedObserver;

import rx.schedulers.Schedulers;

@BenchmarkMode(Mode.Throughput)

@OutputTimeUnit(TimeUnit.SECONDS)

@State(Scope.Thread)

public class OperatorFlatMapPerf {

@State(Scope.Thread)

public static class Input extends InputWithIncrementingInteger {

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

public int size;

@Override

public int getSize() {

return size;

}

}

@Benchmark

public void flatMapIntPassthruSync(Input input) throws InterruptedException {

input.observable.flatMap(new Func1<Integer, Observable<Integer>>() {

@Override

public Observable<Integer> call(Integer i) {

return Observable.just(i);

}

}).subscribe(input.observer);

}

@Benchmark

public void flatMapIntPassthruAsync(Input input) throws InterruptedException {

LatchedObserver<Integer> latchedObserver = input.newLatchedObserver();

input.observable.flatMap(new Func1<Integer, Observable<Integer>>() {

@Override

public Observable<Integer> call(Integer i) {

return Observable.just(i).subscribeOn(Schedulers.computation());

}

}).subscribe(latchedObserver);

latchedObserver.latch.await();

}

@Benchmark

public void flatMapTwoNestedSync(final Input input) throws InterruptedException {

Observable.range(1, 2).flatMap(new Func1<Integer, Observable<Integer>>() {

@Override

public Observable<Integer> call(Integer i) {

return input.observable;

}

}).subscribe(input.observer);

}

// this runs out of memory currently

// @Benchmark

// public void flatMapTwoNestedAsync(final Input input) throws InterruptedException {

// Observable.range(1, 2).flatMap(new Func1<Integer, Observable<Integer>>() {

//

// @Override

// public Observable<Integer> call(Integer i) {

// return input.observable.subscribeOn(Schedulers.computation());

// }

//

// }).subscribe(input.observer);

// }

}