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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.*;

import org.openjdk.jmh.infra.Blackhole;

import rx.*;

import rx.internal.operators.*;

/**

* 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 .*FromComparison.*"

* <p>

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

*/

@BenchmarkMode(Mode.Throughput)

@OutputTimeUnit(TimeUnit.SECONDS)

@State(Scope.Thread)

public class FromComparison {

@Param({ "1", "10", "100", "1000", "1000000" })

public int times;

Observable<Integer> iterableSource;

Observable<Integer> arraySource;

@Setup

public void setup() {

Integer[] array = new Integer[times];

Arrays.fill(array, 1);

iterableSource = Observable.create(new OnSubscribeFromIterable<Integer>(Arrays.asList(array)));

arraySource = Observable.create(new OnSubscribeFromArray<Integer>(array));

}

@Benchmark

public void fastpathIterable(Blackhole bh) {

iterableSource.subscribe(new RequestingSubscriber<Object>(bh, Long.MAX_VALUE));

}

@Benchmark

public void fastpathArray(Blackhole bh) {

arraySource.subscribe(new RequestingSubscriber<Object>(bh, Long.MAX_VALUE));

}

@Benchmark

public void slowpathIterable(Blackhole bh) {

iterableSource.subscribe(new RequestingSubscriber<Object>(bh, times + 1));

}

@Benchmark

public void slowpathArray(Blackhole bh) {

arraySource.subscribe(new RequestingSubscriber<Object>(bh, times + 1));

}

@Benchmark

public void slowpathIterable2(Blackhole bh) {

iterableSource.subscribe(new RequestingSubscriber<Object>(bh, 128));

}

@Benchmark

public void slowpathArray2(Blackhole bh) {

arraySource.subscribe(new RequestingSubscriber<Object>(bh, 128));

}

static final class RequestingSubscriber<T> extends Subscriber<T> {

final Blackhole bh;

final long limit;

long received;

Producer p;

public RequestingSubscriber(Blackhole bh, long limit) {

this.bh = bh;

this.limit = limit;

}

@Override

public void onNext(T t) {

bh.consume(t);

if (++received >= limit) {

received = 0L;

p.request(limit);

}

}

@Override

public void onError(Throwable e) {

e.printStackTrace();

}

@Override

public void onCompleted() {

}

@Override

public void setProducer(Producer p) {

this.p = p;

p.request(limit);

}

}

}