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FlatMapAsFilterPerf.java

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FlatMapAsFilterPerf.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 rx.operators;

import java.util.concurrent.TimeUnit;

import org.openjdk.jmh.annotations.*;

import org.openjdk.jmh.infra.Blackhole;

import rx.Observable;

import rx.functions.Func1;

import rx.jmh.LatchedObserver;

/**

* Benchmark flatMap running over a mixture of normal and empty Observables.

* <p>

* gradlew benchmarks "-Pjmh=-f 1 -tu s -bm thrpt -wi 5 -i 5 -r 1 .*FlatMapAsFilterPerf.*"

* <p>

* gradlew benchmarks "-Pjmh=-f 1 -tu ns -bm avgt -wi 5 -i 5 -r 1 .*FlatMapAsFilterPerf.*"

*/

@BenchmarkMode(Mode.Throughput)

@OutputTimeUnit(TimeUnit.SECONDS)

@State(Scope.Thread)

public class FlatMapAsFilterPerf {

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

public int count;

@Param({"0", "1", "3", "7"})

public int mask;

public Observable<Integer> justEmptyFlatMap;

public Observable<Integer> rangeEmptyFlatMap;

public Observable<Integer> justEmptyConcatMap;

public Observable<Integer> rangeEmptyConcatMap;

@Setup

public void setup() {

if (count == 1 && mask != 0) {

throw new RuntimeException("Force skip");

}

Integer[] values = new Integer[count];

for (int i = 0; i < count; i++) {

values[i] = i;

}

final Observable<Integer> just = Observable.just(1);

final Observable<Integer> range = Observable.range(1, 2);

final Observable<Integer> empty = Observable.empty();

final int m = mask;

justEmptyFlatMap = Observable.from(values).flatMap(new Func1<Integer, Observable<Integer>>() {

@Override

public Observable<Integer> call(Integer v) {

return (v & m) == 0 ? empty : just;

}

});

rangeEmptyFlatMap = Observable.from(values).flatMap(new Func1<Integer, Observable<Integer>>() {

@Override

public Observable<Integer> call(Integer v) {

return (v & m) == 0 ? empty : range;

}

});

justEmptyConcatMap = Observable.from(values).concatMap(new Func1<Integer, Observable<Integer>>() {

@Override

public Observable<Integer> call(Integer v) {

return (v & m) == 0 ? empty : just;

}

});

rangeEmptyConcatMap = Observable.from(values).concatMap(new Func1<Integer, Observable<Integer>>() {

@Override

public Observable<Integer> call(Integer v) {

return (v & m) == 0 ? empty : range;

}

});

}

@Benchmark

public void justEmptyFlatMap(Blackhole bh) {

justEmptyFlatMap.subscribe(new LatchedObserver<Integer>(bh));

}

@Benchmark

public void rangeEmptyFlatMap(Blackhole bh) {

rangeEmptyFlatMap.subscribe(new LatchedObserver<Integer>(bh));

}

@Benchmark

public void justEmptyConcatMap(Blackhole bh) {

justEmptyConcatMap.subscribe(new LatchedObserver<Integer>(bh));

}

@Benchmark

public void rangeEmptyConcatMap(Blackhole bh) {

rangeEmptyConcatMap.subscribe(new LatchedObserver<Integer>(bh));

}

}