2.x: perf: comparison of range and flatMap between Observable,

NbpObservable and Single.

Author: akarnokd

src/perf/java/io/reactivex/EachTypeFlatMapPerf.java

@@ -0,0 +1,91 @@
+/**
+ * Copyright 2015 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 io.reactivex;
+
+import java.util.concurrent.*;
+
+import org.openjdk.jmh.annotations.*;
+import org.openjdk.jmh.infra.Blackhole;
+
+@BenchmarkMode(Mode.Throughput)
+@Warmup(iterations = 5)
+@Measurement(iterations = 5, time = 5, timeUnit = TimeUnit.SECONDS)
+@OutputTimeUnit(TimeUnit.SECONDS)
+@Fork(value = 1)
+@State(Scope.Thread)
+public class EachTypeFlatMapPerf {
+    @Param({ "1", "1000", "1000000" })
+    public int times;
+    
+    Observable<Integer> bpRange;
+    NbpObservable<Integer> nbpRange;
+    Single<Integer> singleJust;
+
+    Observable<Integer> bpRangeMapJust;
+    NbpObservable<Integer> nbpRangeMapJust;
+    Single<Integer> singleJustMapJust;
+
+    Observable<Integer> bpRangeMapRange;
+    NbpObservable<Integer> nbpRangeMapRange;
+
+    @Setup
+    public void setup() {
+        bpRange = Observable.range(1, times);
+        nbpRange = NbpObservable.range(1, times);
+
+        bpRangeMapJust = bpRange.flatMap(Observable::just);
+        nbpRangeMapJust = nbpRange.flatMap(NbpObservable::just);
+        
+        bpRangeMapRange = bpRange.flatMap(v -> Observable.range(v, 2));
+        nbpRangeMapRange = nbpRange.flatMap(v -> NbpObservable.range(v, 2));
+
+        singleJust = Single.just(1);
+        singleJustMapJust = singleJust.flatMap(Single::just);
+    }
+    
+    @Benchmark
+    public void bpRange(Blackhole bh) {
+        bpRange.subscribe(new LatchedObserver<>(bh));
+    }
+    @Benchmark
+    public void bpRangeMapJust(Blackhole bh) {
+        bpRangeMapJust.subscribe(new LatchedObserver<>(bh));
+    }
+    @Benchmark
+    public void bpRangeMapRange(Blackhole bh) {
+        bpRangeMapRange.subscribe(new LatchedObserver<>(bh));
+    }
+
+    @Benchmark
+    public void nbpRange(Blackhole bh) {
+        nbpRange.subscribe(new LatchedNbpObserver<>(bh));
+    }
+    @Benchmark
+    public void nbpRangeMapJust(Blackhole bh) {
+        nbpRangeMapJust.subscribe(new LatchedNbpObserver<>(bh));
+    }
+    @Benchmark
+    public void nbpRangeMapRange(Blackhole bh) {
+        nbpRangeMapRange.subscribe(new LatchedNbpObserver<>(bh));
+    }
+
+    @Benchmark
+    public void singleJust(Blackhole bh) {
+        singleJust.subscribe(new LatchedSingleObserver<>(bh));
+    }
+    @Benchmark
+    public void singleJustMapJust(Blackhole bh) {
+        singleJustMapJust.subscribe(new LatchedSingleObserver<>(bh));
+    }
+}

src/perf/java/io/reactivex/LatchedNbpObserver.java

@@ -0,0 +1,47 @@
+/**
+ * Copyright 2015 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 io.reactivex;
+
+import java.util.concurrent.CountDownLatch;
+
+import org.openjdk.jmh.infra.Blackhole;
+
+import io.reactivex.NbpObservable.NbpSubscriber;
+import io.reactivex.disposables.Disposable;
+
+public final class LatchedNbpObserver<T> implements NbpSubscriber<T> {
+    final CountDownLatch cdl;
+    final Blackhole bh;
+    public LatchedNbpObserver(Blackhole bh) {
+        this.bh = bh;
+        this.cdl = new CountDownLatch(1);
+    }
+    @Override
+    public void onSubscribe(Disposable d) {
+        
+    }
+    @Override
+    public void onNext(T value) {
+        bh.consume(value);
+    }
+    @Override
+    public void onError(Throwable e) {
+        e.printStackTrace();
+        cdl.countDown();
+    }
+    @Override
+    public void onComplete() {
+        cdl.countDown();
+    }
+}

src/perf/java/io/reactivex/LatchedSingleObserver.java

@@ -0,0 +1,44 @@
+/**
+ * Copyright 2015 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 io.reactivex;
+
+import java.util.concurrent.CountDownLatch;
+
+import org.openjdk.jmh.infra.Blackhole;
+
+import io.reactivex.Single.SingleCallback;
+import io.reactivex.disposables.Disposable;
+
+public final class LatchedSingleObserver<T> implements SingleCallback<T> {
+    final CountDownLatch cdl;
+    final Blackhole bh;
+    public LatchedSingleObserver(Blackhole bh) {
+        this.bh = bh;
+        this.cdl = new CountDownLatch(1);
+    }
+    @Override
+    public void onSubscribe(Disposable d) {
+        
+    }
+    @Override
+    public void onSuccess(T value) {
+        bh.consume(value);
+        cdl.countDown();
+    }
+    @Override
+    public void onFailure(Throwable e) {
+        e.printStackTrace();
+        cdl.countDown();
+    }
+}