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/*

* Copyright 2011-2015 David Karnok

*

* 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 rx.Observable;

import rx.functions.Func1;

/**

* Benchmark flatMap's optimizations.

* <p>

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

* <p>

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

*/

@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 FlatMapPerf {

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

public int times;

Observable<Integer> rxSource;

Observable<Integer> rxSource2;

@Setup

public void setup() {

Observable<Integer> rxRange = Observable.range(0, times);

rxSource = rxRange.flatMap(new Func1<Integer, Observable<Integer>>() {

@Override

public Observable<Integer> call(Integer t) {

return Observable.just(t);

}

});

rxSource2 = rxRange.flatMap(new Func1<Integer, Observable<Integer>>() {

@Override

public Observable<Integer> call(Integer v) {

return Observable.range(v, 2);

}

});

}

@Benchmark

public Object rxFlatMap() {

return rxSource.subscribe();

}

@Benchmark

public Object rxFlatMap2() {

return rxSource2.subscribe();

}

}