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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.Func1;

import rx.internal.util.UtilityFunctions;

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 .*RedoPerf.*"

* <p>

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

*/

@BenchmarkMode(Mode.Throughput)

@OutputTimeUnit(TimeUnit.SECONDS)

@State(Scope.Thread)

public class RedoPerf {

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

public String params;

public int len;

public int repeat;

Observable<Integer> sourceRepeating;

Observable<Integer> sourceRetrying;

Observable<Integer> redoRepeating;

Observable<Integer> redoRetrying;

Observable<Integer> baseline;

@SuppressWarnings({ "rawtypes", "unchecked" })

@Setup

public void setup() {

String[] ps = params.split(",");

len = Integer.parseInt(ps[0]);

repeat = Integer.parseInt(ps[1]);

Integer[] values = new Integer[len];

Arrays.fill(values, 777);

Observable<Integer> source = Observable.from(values);

Observable<Integer> error = source.concatWith(Observable.<Integer>error(new RuntimeException()));

Integer[] values2 = new Integer[len * repeat];

Arrays.fill(values2, 777);

baseline = Observable.from(values2);

sourceRepeating = source.repeat(repeat);

sourceRetrying = error.retry(repeat);

redoRepeating = source.repeatWhen((Func1)UtilityFunctions.identity()).take(len * repeat);

redoRetrying = error.retryWhen((Func1)UtilityFunctions.identity()).take(len * repeat);

}

@Benchmark

public void baseline(Blackhole bh) {

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

}

@Benchmark

public void repeatCounted(Blackhole bh) {

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

}

@Benchmark

public void retryCounted(Blackhole bh) {

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

}

@Benchmark

public void repeatWhen(Blackhole bh) {

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

}

@Benchmark

public void retryWhen(Blackhole bh) {

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

}

}