112 lines
2.8 KiB
Java
112 lines
2.8 KiB
Java
/*
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* Copyright (C) 2016 The Guava Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.common.collect;
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import com.google.caliper.BeforeExperiment;
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import com.google.caliper.Benchmark;
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import com.google.caliper.Param;
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import com.google.caliper.api.SkipThisScenarioException;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.LinkedList;
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import java.util.NoSuchElementException;
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import java.util.function.Supplier;
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import java.util.stream.Stream;
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/**
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* Test stream operation speed.
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*
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* @author Louis Wasserman
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*/
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public class StreamsBenchmark {
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@Param({"1", "10", "100", "1000", "10000"})
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private int size;
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enum CollectionType {
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ARRAY_LIST(ArrayList::new),
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LINKED_LIST(LinkedList::new);
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final Supplier<Collection<Object>> supplier;
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private CollectionType(Supplier<Collection<Object>> supplier) {
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this.supplier = supplier;
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}
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}
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@Param private CollectionType source;
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enum Operation {
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FIND_FIRST {
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@Override
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Object operate(Stream<?> stream) {
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return stream.findFirst();
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}
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},
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STREAMS_ONLY_ELEMENT {
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@Override
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Object operate(Stream<?> stream) {
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try {
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return stream.collect(MoreCollectors.onlyElement());
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} catch (IllegalArgumentException | NoSuchElementException e) {
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throw new SkipThisScenarioException();
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}
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}
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},
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STREAMS_FIND_LAST {
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@Override
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Object operate(Stream<?> stream) {
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return Streams.findLast(stream);
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}
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},
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REDUCE_LAST {
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@Override
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Object operate(Stream<?> stream) {
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return stream.reduce((a, b) -> b);
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}
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},
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REDUCE_LAST_PARALLEL {
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@Override
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Object operate(Stream<?> stream) {
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return stream.parallel().reduce((a, b) -> b);
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}
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};
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abstract Object operate(Stream<?> stream);
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}
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@Param private Operation operation;
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Collection<Object> collection;
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@BeforeExperiment
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void setUp() {
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collection = source.supplier.get();
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for (int i = 0; i < size; i++) {
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collection.add(new Object());
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}
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}
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@Benchmark
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int runOperation(int reps) {
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int result = 0;
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for (int i = 0; i < reps; i++) {
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result += System.identityHashCode(operation.operate(collection.stream()));
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}
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return result;
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}
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}
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