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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.Arrays;

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.Func2;

import rx.jmh.LatchedObserver;

import rx.schedulers.Schedulers;

/**

* Benchmark the Zip operator.

* <p>

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

* <p>

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

*/

@BenchmarkMode(Mode.Throughput)

@OutputTimeUnit(TimeUnit.SECONDS)

@State(Scope.Thread)

public class ZipPerf {

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

public int firstLen;

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

public int secondLen;

Observable<Integer> baseline;

Observable<Integer> bothSync;

Observable<Integer> firstSync;

Observable<Integer> secondSync;

Observable<Integer> bothAsync;

boolean small;

@Setup

public void setup() {

Integer[] array1 = new Integer[firstLen];

Arrays.fill(array1, 777);

Integer[] array2 = new Integer[secondLen];

Arrays.fill(array2, 777);

baseline = Observable.from(firstLen < secondLen? array2 : array1);

Observable<Integer> o1 = Observable.from(array1);

Observable<Integer> o2 = Observable.from(array2);

Func2<Integer, Integer, Integer> plus = new Func2<Integer, Integer, Integer>() {

@Override

public Integer call(Integer a, Integer b) {

return a + b;

}

};

bothSync = Observable.zip(o1, o2, plus);

firstSync = Observable.zip(o1, o2.subscribeOn(Schedulers.computation()), plus);

secondSync = Observable.zip(o1.subscribeOn(Schedulers.computation()), o2, plus);

bothAsync = Observable.zip(o1.subscribeOn(Schedulers.computation()), o2.subscribeOn(Schedulers.computation()), plus);

small = Math.min(firstLen, secondLen) < 100;

}

@Benchmark

public void baseline(Blackhole bh) {

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

}

@Benchmark

public void syncSync(Blackhole bh) {

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

}

@Benchmark

public void syncAsync(Blackhole bh) throws Exception {

LatchedObserver<Integer> o = new LatchedObserver<Integer>(bh);

firstSync.subscribe(o);

if (small) {

while (o.latch.getCount() != 0);

} else {

o.latch.await();

}

}

@Benchmark

public void asyncSync(Blackhole bh) throws Exception {

LatchedObserver<Integer> o = new LatchedObserver<Integer>(bh);

secondSync.subscribe(o);

if (small) {

while (o.latch.getCount() != 0);

} else {

o.latch.await();

}

}

@Benchmark

public void asyncAsync(Blackhole bh) throws Exception {

LatchedObserver<Integer> o = new LatchedObserver<Integer>(bh);

bothAsync.subscribe(o);

if (small) {

while (o.latch.getCount() != 0);

} else {

o.latch.await();

}

}

}