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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.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.jmh.LatchedObserver;

/**

* 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 .*ConcatPerf.*"

* <p>

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

*/

@BenchmarkMode(Mode.Throughput)

@OutputTimeUnit(TimeUnit.SECONDS)

@State(Scope.Thread)

public class ConcatPerf {

Observable<Integer> source;

Observable<Integer> baseline;

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

int count;

@Setup

public void setup() {

Integer[] array = new Integer[count];

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

array[i] = 777;

}

baseline = Observable.from(array);

source = Observable.concat(baseline, Observable.<Integer>empty());

}

@Benchmark

public void normal(Blackhole bh) {

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

}

@Benchmark

public void baseline(Blackhole bh) {

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

}

}