122 lines
4.2 KiB
Java
122 lines
4.2 KiB
Java
/*
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* Copyright (c) 2018, 2021, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package org.openjdk.bench.java.util;
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import org.openjdk.jmh.annotations.Benchmark;
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import org.openjdk.jmh.annotations.BenchmarkMode;
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import org.openjdk.jmh.annotations.Fork;
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import org.openjdk.jmh.annotations.Measurement;
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import org.openjdk.jmh.annotations.Mode;
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import org.openjdk.jmh.annotations.OutputTimeUnit;
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import org.openjdk.jmh.annotations.Param;
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import org.openjdk.jmh.annotations.Scope;
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import org.openjdk.jmh.annotations.Setup;
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import org.openjdk.jmh.annotations.State;
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import org.openjdk.jmh.annotations.Warmup;
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import java.util.StringJoiner;
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import java.util.concurrent.ThreadLocalRandom;
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import java.util.concurrent.TimeUnit;
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/**
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* Trivial benchmark for String joining with {@link java.util.StringJoiner}.
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*/
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@BenchmarkMode(Mode.AverageTime)
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@OutputTimeUnit(TimeUnit.NANOSECONDS)
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@Warmup(iterations = 10, time = 500, timeUnit = TimeUnit.MILLISECONDS)
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@Measurement(iterations = 10, time = 500, timeUnit = TimeUnit.MILLISECONDS)
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@Fork(value = 3, jvmArgs = {"-Xms1g", "-Xmx1g"})
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public class StringJoinerBenchmark {
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@Benchmark
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public String join(Data data) {
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String[] stringArray = data.stringArray;
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return String.join(",", stringArray);
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}
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@Benchmark
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public String stringJoiner(Data data) {
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String[] stringArray = data.stringArray;
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return Joiner.joinWithStringJoiner(stringArray);
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}
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@State(Scope.Thread)
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public static class Data {
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@Param({"latin", "cyrillic"})
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private String mode;
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@Param({"1", "8", "32", "128"})
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private int length;
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@Param({"5", "20"})
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private int count;
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private String[] stringArray;
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@Setup
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public void setup() {
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stringArray = new String[count];
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for (int i = 0; i < count; i++) {
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String alphabet = getAlphabet(i, mode);
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stringArray[i] = randomString(alphabet, length);
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}
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}
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private String randomString(String alphabet, int length) {
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var tl = ThreadLocalRandom.current();
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StringBuilder sb = new StringBuilder();
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for (int i = 0; i < length; i++) {
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sb.append(alphabet.charAt(tl.nextInt(alphabet.length())));
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}
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return sb.toString();
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}
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private static String getAlphabet(int index, String mode) {
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var latin = "abcdefghijklmnopqrstuvwxyz"; //English
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StringBuilder sb = new StringBuilder();
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latin.codePoints().forEach(cp -> sb.append(cp - 'a' + '\u0430'));
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var cyrillic = sb.toString(); // Russian (partial, matching length of latin alphabet)
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String alphabet;
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switch (mode) {
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case "latin" -> alphabet = latin;
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case "cyrillic" -> alphabet = cyrillic;
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default -> throw new RuntimeException("Illegal mode " + mode);
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}
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return alphabet;
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}
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}
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}
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class Joiner {
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public static String joinWithStringJoiner(String[] stringArray) {
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StringJoiner joiner = new StringJoiner(",", "[", "]");
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for (String str : stringArray) {
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joiner.add(str);
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}
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return joiner.toString();
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}
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}
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