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StringFormatBenchmark.java
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StringFormatBenchmark.java
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/*
* JVM Performance Benchmarks
*
* Copyright (C) 2019 - 2024 Ionut Balosin
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 com.ionutbalosin.jvm.performance.benchmarks.api.string;
import com.ionutbalosin.jvm.performance.benchmarks.api.string.utils.StringUtils.Coder;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Param;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.Warmup;
import java.text.MessageFormat;
import java.util.Random;
import java.util.concurrent.TimeUnit;
import static com.ionutbalosin.jvm.performance.benchmarks.api.string.utils.StringUtils.generateCharArray;
import static java.util.FormatProcessor.FMT;
/*
* This benchmark measures the performance of different formatting approaches utilizing various data types
* (e.g., String, int, float, char, long, double, boolean, Object) using different methods:
* - String.format()
* - MessageFormat.format() with both constant or dynamically allocated message formatter in the benchmark method
* - String.formatted()
* - FormatProcessor
*
* The input String and char consist of characters encoded in either Latin-1 or UTF-16.
*
* Note: The benchmark might encompass different allocations, potentially impacting the overall results.
*/
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Warmup(iterations = 5, time = 10, timeUnit = TimeUnit.SECONDS)
@Measurement(iterations = 5, time = 10, timeUnit = TimeUnit.SECONDS)
@Fork(value = 5)
@State(Scope.Benchmark)
public class StringFormatBenchmark {
// $ java -jar */*/benchmarks.jar ".*StringFormatBenchmark.*"
// Recommended command line options:
// - JMH options: -prof gc
private final Random random = new Random(16384);
private final MessageFormat MESSAGE_FORMAT = new MessageFormat(
"{0}{1,number,0}{2,number,0.00000000}{3}{4,number,0}{5,number,0.00000000000000000}{6}{7,number,0}");
private String aString;
private int anInt;
private float aFloat;
private char aChar;
private long aLong;
private double aDouble;
private boolean aBool;
private Object anObject;
@Param({"128"})
private int length;
@Param private Coder coder;
@Setup
public void setup() {
aString = new String(generateCharArray(length, coder));
anInt = random.nextInt();
aFloat = random.nextFloat();
aChar = generateCharArray(1, coder)[0];
aLong = random.nextLong();
aDouble = random.nextDouble();
aBool = random.nextBoolean();
anObject = random.nextLong();
}
@Benchmark
public String string_format() {
return String.format(
"%s%d%.8f%s%d%.17f%b%s", aString, anInt, aFloat, aChar, aLong, aDouble, aBool, anObject);
}
@Benchmark
public String message_format_new() {
final MessageFormat mf =
new MessageFormat(
"{0}{1,number,0}{2,number,0.00000000}{3}{4,number,0}{5,number,0.00000000000000000}{6}{7,number,0}");
return mf.format(new Object[] {aString, anInt, aFloat, aChar, aLong, aDouble, aBool, anObject});
}
@Benchmark
public String message_format_constant() {
return MESSAGE_FORMAT.format(new Object[] {aString, anInt, aFloat, aChar, aLong, aDouble, aBool, anObject});
}
@Benchmark
public String string_formatted() {
return "%s%d%.8f%s%d%.17f%b%s".formatted(aString, anInt, aFloat, aChar, aLong, aDouble, aBool, anObject);
}
@Benchmark
public String format_processor() {
return FMT."%s\{aString}%d\{anInt}%.8f\{aFloat}%s\{aChar}%d\{aLong}%.17f\{aDouble}%b\{aBool}%s\{anObject}";
}
}