/**
* 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.ArrayList;
import java.util.List;
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.jmh.InputWithIncrementingInteger;
import rx.jmh.LatchedObserver;
import rx.schedulers.Schedulers;
@BenchmarkMode(Mode.Throughput)
@OutputTimeUnit(TimeUnit.SECONDS)
public class OperatorMergePerf {
// flatMap
@Benchmark
public void oneStreamOfNthatMergesIn1(final InputMillion input) throws InterruptedException {
Observable<Observable<Integer>> os = Observable.range(1, input.size).map(new Func1<Integer, Observable<Integer>>() {
@Override
public Observable<Integer> call(Integer i) {
return Observable.just(i);
}
});
LatchedObserver<Integer> o = input.newLatchedObserver();
Observable.merge(os).subscribe(o);
o.latch.await();
}
// flatMap
@Benchmark
public void merge1SyncStreamOfN(final InputMillion input) throws InterruptedException {
Observable<Observable<Integer>> os = Observable.just(1).map(new Func1<Integer, Observable<Integer>>() {
@Override
public Observable<Integer> call(Integer i) {
return Observable.range(0, input.size);
}
});
LatchedObserver<Integer> o = input.newLatchedObserver();
Observable.merge(os).subscribe(o);
o.latch.await();
}
@Benchmark
public void mergeNSyncStreamsOfN(final InputThousand input) throws InterruptedException {
Observable<Observable<Integer>> os = input.observable.map(new Func1<Integer, Observable<Integer>>() {
@Override
public Observable<Integer> call(Integer i) {
return Observable.range(0, input.size);
}
});
LatchedObserver<Integer> o = input.newLatchedObserver();
Observable.merge(os).subscribe(o);
o.latch.await();
}
@Benchmark
public void mergeNAsyncStreamsOfN(final InputThousand input) throws InterruptedException {
Observable<Observable<Integer>> os = input.observable.map(new Func1<Integer, Observable<Integer>>() {
@Override
public Observable<Integer> call(Integer i) {
return Observable.range(0, input.size).subscribeOn(Schedulers.computation());
}
});
LatchedObserver<Integer> o = input.newLatchedObserver();
Observable.merge(os).subscribe(o);
o.latch.await();
}
@Benchmark
public void mergeTwoAsyncStreamsOfN(final InputThousand input) throws InterruptedException {
LatchedObserver<Integer> o = input.newLatchedObserver();
Observable<Integer> ob = Observable.range(0, input.size).subscribeOn(Schedulers.computation());
Observable.merge(ob, ob).subscribe(o);
o.latch.await();
}
@Benchmark
public void mergeNSyncStreamsOf1(final InputForMergeN input) throws InterruptedException {
LatchedObserver<Integer> o = input.newLatchedObserver();
Observable.merge(input.observables).subscribe(o);
o.latch.await();
}
@State(Scope.Thread)
public static class InputForMergeN {
@Param({ "1", "100", "1000" })
// @Param({ "1000" })
public int size;
private Blackhole bh;
List<Observable<Integer>> observables;
@Setup
public void setup(final Blackhole bh) {
this.bh = bh;
observables = new ArrayList<Observable<Integer>>();
for (int i = 0; i < size; i++) {
observables.add(Observable.just(i));
}
}
public LatchedObserver<Integer> newLatchedObserver() {
return new LatchedObserver<Integer>(bh);
}
}
@State(Scope.Thread)
public static class InputMillion extends InputWithIncrementingInteger {
@Param({ "1", "1000", "1000000" })
// @Param({ "1000" })
public int size;
@Override
public int getSize() {
return size;
}
}
@State(Scope.Thread)
public static class InputThousand extends InputWithIncrementingInteger {
@Param({ "1", "1000" })
// @Param({ "1000" })
public int size;
@Override
public int getSize() {
return size;
}
}
}