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StringConcatenationBenchmark.java
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StringConcatenationBenchmark.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 static com.ionutbalosin.jvm.performance.benchmarks.api.string.utils.StringUtils.generateCharArray;
import static java.lang.String.valueOf;
import com.ionutbalosin.jvm.performance.benchmarks.api.string.utils.StringUtils.Coder;
import java.util.Random;
import java.util.concurrent.TimeUnit;
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;
/**
* Benchmark measuring the performance of various concatenation methods using different data types
* (e.g., String, int, float, char, long, double, boolean, Object):
* - StringBuilder
* - StringBuffer
* - String.concat()
* - plus operator
* - StringTemplate
*
* The input String and char contain 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 StringConcatenationBenchmark {
// $ java -jar */*/benchmarks.jar ".*StringConcatenationBenchmark.*"
// Recommended command line options:
// - JMH options: -prof gc
private final Random random = new Random(16384);
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_builder() {
// Do not explicitly set a capacity
return new StringBuilder()
.append(aString)
.append(anInt)
.append(aFloat)
.append(aChar)
.append(aLong)
.append(aDouble)
.append(aBool)
.append(anObject)
.toString();
}
@Benchmark
public String string_buffer() {
// Do not explicitly set a capacity
return new StringBuffer()
.append(aString)
.append(anInt)
.append(aFloat)
.append(aChar)
.append(aLong)
.append(aDouble)
.append(aBool)
.append(anObject)
.toString();
}
@Benchmark
public String string_concat() {
return new String()
.concat(aString)
.concat(valueOf(anInt))
.concat(valueOf(aFloat))
.concat(valueOf(aChar))
.concat(valueOf(aLong))
.concat(valueOf(aDouble))
.concat(valueOf(aBool))
.concat(valueOf(anObject));
}
@Benchmark
public String plus_operator() {
return aString + anInt + aFloat+ aChar + aLong + aDouble + aBool + anObject ;
}
@Benchmark
public String string_template() {
return STR."\{aString}\{anInt}\{aFloat}\{aChar}\{aLong}\{aDouble}\{aBool}\{anObject}";
}
}