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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.*;

import java.util.concurrent.*;

import org.openjdk.jmh.annotations.*;

import org.openjdk.jmh.infra.Blackhole;

import rx.*;

import rx.Observable;

import rx.observables.ConnectableObservable;

import rx.schedulers.Schedulers;

/**

* Benchmark typical atomic operations on volatile fields and AtomicXYZ classes.

* <p>

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

* <p>

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

*/

@BenchmarkMode(Mode.Throughput)

@OutputTimeUnit(TimeUnit.SECONDS)

@State(Scope.Thread)

public class OperatorPublishPerf {

static final class SharedLatchObserver extends Subscriber<Integer> {

final CountDownLatch cdl;

final int batchFrequency;

final Blackhole bh;

int received;

public SharedLatchObserver(CountDownLatch cdl, int batchFrequency, Blackhole bh) {

this.cdl = cdl;

this.batchFrequency = batchFrequency;

this.bh = bh;

}

@Override

public void onStart() {

request(batchFrequency);

}

@Override

public void onNext(Integer t) {

if (bh != null) {

bh.consume(t);

}

if (++received == batchFrequency) {

received = 0;

request(batchFrequency);

}

}

@Override

public void onError(Throwable e) {

e.printStackTrace();

cdl.countDown();

}

@Override

public void onCompleted() {

cdl.countDown();

}

}

/** How long the range should be. */

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

private int size;

/** Should children use observeOn? */

@Param({"false", "true"})

private boolean async;

/** Number of child subscribers. */

@Param({"0", "1", "2", "3", "4", "5"})

private int childCount;

/** How often the child subscribers should re-request. */

@Param({"1", "2", "4", "8", "16", "32", "64"})

private int batchFrequency;

private ConnectableObservable<Integer> source;

private Observable<Integer> observable;

@Setup

public void setup() {

List<Integer> list = new ArrayList<Integer>();

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

list.add(i);

}

Observable<Integer> src = Observable.from(list);

source = src.publish();

observable = async ? source.observeOn(Schedulers.computation()) : source;

}

@Benchmark

public void benchmark(Blackhole bh) throws InterruptedException,

TimeoutException, BrokenBarrierException {

CountDownLatch completion = null;

int cc = childCount;

if (cc > 0) {

completion = new CountDownLatch(cc);

Observable<Integer> o = observable;

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

o.subscribe(new SharedLatchObserver(completion, batchFrequency, bh));

}

}

Subscription s = source.connect();

if (completion != null && !completion.await(2, TimeUnit.SECONDS)) {

throw new RuntimeException("Source hung!");

}

s.unsubscribe();

}

public static void main(String[] args) throws Exception {

OperatorPublishPerf o = new OperatorPublishPerf();

o.async = false;

o.batchFrequency = 1;

o.childCount = 0;

o.size = 1;

o.setup();

for (int j = 0; j < 1000; j++) {

o.benchmark(null);

}

}

}