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ForBenchmark.java
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ForBenchmark.java
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/* __ __ __ __ __ ___
* \ \ / / \ \ / / __/
* \ \/ / /\ \ \/ / /
* \____/__/ \__\____/__/
*
* Copyright 2014-2018 Vavr, http://vavr.io
*
* 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.vavr.idiom;
import io.vavr.JmhRunner;
import io.vavr.collection.Array;
import org.junit.Test;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.function.BiFunction;
import static java.util.stream.Collectors.toList;
import static io.vavr.API.*;
import static io.vavr.JmhRunner.getRandomValues;
/**
* Benchmark for nested loops vs Vavr's For().yield comprehensions.
*
* @see For2
*/
public class ForBenchmark {
static final Array<Class<?>> CLASSES = Array(
For.class
);
@Test
public void testAsserts() {
JmhRunner.runDebugWithAsserts(CLASSES);
}
public static void main(String... args) {
JmhRunner.runNormalNoAsserts(CLASSES);
}
@State(Scope.Benchmark)
public static class Base {
int CONTAINER_SIZE = 1000;
int AGGREGATE;
io.vavr.collection.List<Integer> ELEMENTS;
final BiFunction<Integer, Integer, Integer> AGGREGATOR = (i, j) -> i ^ j;
@Setup
public void setup() {
ELEMENTS = io.vavr.collection.List.ofAll(Arrays.stream(getRandomValues(CONTAINER_SIZE, 0, true)));
AGGREGATE = 0;
for (Integer i : ELEMENTS) {
for (Integer j : ELEMENTS) {
AGGREGATE += AGGREGATOR.apply(i, j);
}
}
}
}
public static class For extends Base {
@Benchmark
public Object java_for() {
final List<Integer> result = new ArrayList<>(CONTAINER_SIZE * CONTAINER_SIZE);
for (Integer i : ELEMENTS) {
for (Integer j : ELEMENTS) {
result.add(AGGREGATOR.apply(i, j));
}
}
assert Array(result).sum().intValue() == AGGREGATE;
return result;
}
@Benchmark
public Object vavr_for() {
final List<Integer> result = For(ELEMENTS, ELEMENTS).yield(AGGREGATOR).collect(toList());
assert Array(result).sum().intValue() == AGGREGATE;
return result;
}
}
}