2.x: benchmark (0..1).flatMap and flattenAs performance (#6017)

src/jmh/java/io/reactivex/BinaryFlatMapPerf.java

@@ -0,0 +1,275 @@
+/**
+ * Copyright (c) 2016-present, RxJava Contributors.
+ *
+ * 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.*;
+import java.util.concurrent.TimeUnit;
+
+import org.openjdk.jmh.annotations.*;
+import org.openjdk.jmh.infra.Blackhole;
+import org.reactivestreams.Publisher;
+
+import io.reactivex.Observable;
+import io.reactivex.functions.Function;
+
+@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 BinaryFlatMapPerf {
+    @Param({ "1", "1000", "1000000" })
+    public int times;
+
+    Flowable<Integer> singleFlatMapPublisher;
+
+    Flowable<Integer> singleFlatMapHidePublisher;
+
+    Flowable<Integer> singleFlattenAsPublisher;
+
+    Flowable<Integer> maybeFlatMapPublisher;
+
+    Flowable<Integer> maybeFlatMapHidePublisher;
+
+    Flowable<Integer> maybeFlattenAsPublisher;
+
+    Flowable<Integer> completableFlatMapPublisher;
+
+    Flowable<Integer> completableFlattenAsPublisher;
+
+    Observable<Integer> singleFlatMapObservable;
+
+    Observable<Integer> singleFlatMapHideObservable;
+
+    Observable<Integer> singleFlattenAsObservable;
+
+    Observable<Integer> maybeFlatMapObservable;
+
+    Observable<Integer> maybeFlatMapHideObservable;
+
+    Observable<Integer> maybeFlattenAsObservable;
+
+    Observable<Integer> completableFlatMapObservable;
+
+    Observable<Integer> completableFlattenAsObservable;
+
+    @Setup
+    public void setup() {
+
+        // --------------------------------------------------------------------------
+
+        final Integer[] array = new Integer[times];
+        Arrays.fill(array, 777);
+
+        final List<Integer> list = Arrays.asList(array);
+
+        final Flowable<Integer> arrayFlowable = Flowable.fromArray(array);
+        final Flowable<Integer> arrayFlowableHide = Flowable.fromArray(array).hide();
+        final Flowable<Integer> listFlowable = Flowable.fromIterable(list);
+
+        final Observable<Integer> arrayObservable = Observable.fromArray(array);
+        final Observable<Integer> arrayObservableHide = Observable.fromArray(array).hide();
+        final Observable<Integer> listObservable = Observable.fromIterable(list);
+
+        // --------------------------------------------------------------------------
+
+        singleFlatMapPublisher = Single.just(1).flatMapPublisher(new Function<Integer, Publisher<? extends Integer>>() {
+            @Override
+            public Publisher<? extends Integer> apply(Integer v)
+                    throws Exception {
+                return arrayFlowable;
+            }
+        });
+
+        singleFlatMapHidePublisher = Single.just(1).flatMapPublisher(new Function<Integer, Publisher<? extends Integer>>() {
+            @Override
+            public Publisher<? extends Integer> apply(Integer v)
+                    throws Exception {
+                return arrayFlowableHide;
+            }
+        });
+
+        singleFlattenAsPublisher = Single.just(1).flattenAsFlowable(new Function<Integer, Iterable<? extends Integer>>() {
+            @Override
+            public Iterable<? extends Integer> apply(Integer v)
+                    throws Exception {
+                return list;
+            }
+        });
+
+        maybeFlatMapPublisher = Maybe.just(1).flatMapPublisher(new Function<Integer, Publisher<? extends Integer>>() {
+            @Override
+            public Publisher<? extends Integer> apply(Integer v)
+                    throws Exception {
+                return arrayFlowable;
+            }
+        });
+
+        maybeFlatMapHidePublisher = Maybe.just(1).flatMapPublisher(new Function<Integer, Publisher<? extends Integer>>() {
+            @Override
+            public Publisher<? extends Integer> apply(Integer v)
+                    throws Exception {
+                return arrayFlowableHide;
+            }
+        });
+
+        maybeFlattenAsPublisher = Maybe.just(1).flattenAsFlowable(new Function<Integer, Iterable<? extends Integer>>() {
+            @Override
+            public Iterable<? extends Integer> apply(Integer v)
+                    throws Exception {
+                return list;
+            }
+        });
+
+        completableFlatMapPublisher = Completable.complete().andThen(listFlowable);
+
+        completableFlattenAsPublisher = Completable.complete().andThen(arrayFlowable);
+
+        // --------------------------------------------------------------------------
+
+        singleFlatMapObservable = Single.just(1).flatMapObservable(new Function<Integer, Observable<? extends Integer>>() {
+            @Override
+            public Observable<? extends Integer> apply(Integer v)
+                    throws Exception {
+                return arrayObservable;
+            }
+        });
+
+        singleFlatMapHideObservable = Single.just(1).flatMapObservable(new Function<Integer, Observable<? extends Integer>>() {
+            @Override
+            public Observable<? extends Integer> apply(Integer v)
+                    throws Exception {
+                return arrayObservableHide;
+            }
+        });
+
+        singleFlattenAsObservable = Single.just(1).flattenAsObservable(new Function<Integer, Iterable<? extends Integer>>() {
+            @Override
+            public Iterable<? extends Integer> apply(Integer v)
+                    throws Exception {
+                return list;
+            }
+        });
+
+        maybeFlatMapObservable = Maybe.just(1).flatMapObservable(new Function<Integer, Observable<? extends Integer>>() {
+            @Override
+            public Observable<? extends Integer> apply(Integer v)
+                    throws Exception {
+                return arrayObservable;
+            }
+        });
+
+        maybeFlatMapHideObservable = Maybe.just(1).flatMapObservable(new Function<Integer, Observable<? extends Integer>>() {
+            @Override
+            public Observable<? extends Integer> apply(Integer v)
+                    throws Exception {
+                return arrayObservableHide;
+            }
+        });
+
+        maybeFlattenAsObservable = Maybe.just(1).flattenAsObservable(new Function<Integer, Iterable<? extends Integer>>() {
+            @Override
+            public Iterable<? extends Integer> apply(Integer v)
+                    throws Exception {
+                return list;
+            }
+        });
+
+        completableFlatMapObservable = Completable.complete().andThen(listObservable);
+
+        completableFlattenAsObservable = Completable.complete().andThen(arrayObservable);
+
+    }
+
+    @Benchmark
+    public void singleFlatMapPublisher(Blackhole bh) {
+        singleFlatMapPublisher.subscribe(new PerfConsumer(bh));
+    }
+
+    @Benchmark
+    public void singleFlatMapHidePublisher(Blackhole bh) {
+        singleFlatMapHidePublisher.subscribe(new PerfConsumer(bh));
+    }
+
+    @Benchmark
+    public void singleFlattenAsPublisher(Blackhole bh) {
+        singleFlattenAsPublisher.subscribe(new PerfConsumer(bh));
+    }
+
+    @Benchmark
+    public void maybeFlatMapPublisher(Blackhole bh) {
+        maybeFlatMapPublisher.subscribe(new PerfConsumer(bh));
+    }
+
+    @Benchmark
+    public void maybeFlatMapHidePublisher(Blackhole bh) {
+        maybeFlatMapHidePublisher.subscribe(new PerfConsumer(bh));
+    }
+
+    @Benchmark
+    public void maybeFlattenAsPublisher(Blackhole bh) {
+        maybeFlattenAsPublisher.subscribe(new PerfConsumer(bh));
+    }
+
+    @Benchmark
+    public void completableFlatMapPublisher(Blackhole bh) {
+        completableFlatMapPublisher.subscribe(new PerfConsumer(bh));
+    }
+
+    @Benchmark
+    public void completableFlattenAsPublisher(Blackhole bh) {
+        completableFlattenAsPublisher.subscribe(new PerfConsumer(bh));
+    }
+
+    @Benchmark
+    public void singleFlatMapObservable(Blackhole bh) {
+        singleFlatMapObservable.subscribe(new PerfConsumer(bh));
+    }
+
+    @Benchmark
+    public void singleFlatMapHideObservable(Blackhole bh) {
+        singleFlatMapHideObservable.subscribe(new PerfConsumer(bh));
+    }
+
+    @Benchmark
+    public void singleFlattenAsObservable(Blackhole bh) {
+        singleFlattenAsObservable.subscribe(new PerfConsumer(bh));
+    }
+
+    @Benchmark
+    public void maybeFlatMapObservable(Blackhole bh) {
+        maybeFlatMapObservable.subscribe(new PerfConsumer(bh));
+    }
+
+    @Benchmark
+    public void maybeFlatMapHideObservable(Blackhole bh) {
+        maybeFlatMapHideObservable.subscribe(new PerfConsumer(bh));
+    }
+
+    @Benchmark
+    public void maybeFlattenAsObservable(Blackhole bh) {
+        maybeFlattenAsObservable.subscribe(new PerfConsumer(bh));
+    }
+
+    @Benchmark
+    public void completableFlatMapObservable(Blackhole bh) {
+        completableFlatMapObservable.subscribe(new PerfConsumer(bh));
+    }
+
+    @Benchmark
+    public void completableFlattenAsObservable(Blackhole bh) {
+        completableFlattenAsObservable.subscribe(new PerfConsumer(bh));
+    }
+}