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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.ArrayList;

import java.util.List;

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.Setup;

import org.openjdk.jmh.annotations.State;

import org.openjdk.jmh.infra.Blackhole;

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)

public class OperatorMergePerf {

// flatMap

@Benchmark

public void oneStreamOfNthatMergesIn1(final InputMillion input) throws InterruptedException {

Observable<Observable<Integer>> os = Observable.range(1, input.size).map(new Func1<Integer, Observable<Integer>>() {

@Override

public Observable<Integer> call(Integer i) {

return Observable.just(i);

}

});

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

Observable.merge(os).subscribe(o);

o.latch.await();

}

// flatMap

@Benchmark

public void merge1SyncStreamOfN(final InputMillion input) throws InterruptedException {

Observable<Observable<Integer>> os = Observable.just(1).map(new Func1<Integer, Observable<Integer>>() {

@Override

public Observable<Integer> call(Integer i) {

return Observable.range(0, input.size);

}

});

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

Observable.merge(os).subscribe(o);

o.latch.await();

}

@Benchmark

public void mergeNSyncStreamsOfN(final InputThousand input) throws InterruptedException {

Observable<Observable<Integer>> os = input.observable.map(new Func1<Integer, Observable<Integer>>() {

@Override

public Observable<Integer> call(Integer i) {

return Observable.range(0, input.size);

}

});

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

Observable.merge(os).subscribe(o);

o.latch.await();

}

@Benchmark

public void mergeNAsyncStreamsOfN(final InputThousand input) throws InterruptedException {

Observable<Observable<Integer>> os = input.observable.map(new Func1<Integer, Observable<Integer>>() {

@Override

public Observable<Integer> call(Integer i) {

return Observable.range(0, input.size).subscribeOn(Schedulers.computation());

}

});

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

Observable.merge(os).subscribe(o);

o.latch.await();

}

@Benchmark

public void mergeTwoAsyncStreamsOfN(final InputThousand input) throws InterruptedException {

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

Observable<Integer> ob = Observable.range(0, input.size).subscribeOn(Schedulers.computation());

Observable.merge(ob, ob).subscribe(o);

o.latch.await();

}

@Benchmark

public void mergeNSyncStreamsOf1(final InputForMergeN input) throws InterruptedException {

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

Observable.merge(input.observables).subscribe(o);

o.latch.await();

}

@State(Scope.Thread)

public static class InputForMergeN {

@Param({ "1", "100", "1000" })

// @Param({ "1000" })

public int size;

private Blackhole bh;

List<Observable<Integer>> observables;

@Setup

public void setup(final Blackhole bh) {

this.bh = bh;

observables = new ArrayList<Observable<Integer>>();

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

observables.add(Observable.just(i));

}

}

public LatchedObserver<Integer> newLatchedObserver() {

return new LatchedObserver<Integer>(bh);

}

}

@State(Scope.Thread)

public static class InputMillion extends InputWithIncrementingInteger {

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

// @Param({ "1000" })

public int size;

@Override

public int getSize() {

return size;

}

}

@State(Scope.Thread)

public static class InputThousand extends InputWithIncrementingInteger {

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

// @Param({ "1000" })

public int size;

@Override

public int getSize() {

return size;

}

}

}