jdk-24/test/micro/org/openjdk/bench/java/lang/StringDecode.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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package org.openjdk.bench.java.lang;

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 org.openjdk.jmh.infra.Blackhole;

import java.nio.charset.Charset;
import java.util.concurrent.TimeUnit;

@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Fork(value = 3, jvmArgs = "-Xmx1g")
@Warmup(iterations = 5, time = 2)
@Measurement(iterations = 5, time = 3)
@State(Scope.Thread)
public class StringDecode {

    @BenchmarkMode(Mode.AverageTime)
    @OutputTimeUnit(TimeUnit.NANOSECONDS)
    @Fork(value = 3, jvmArgs = "-Xmx1g")
    @Warmup(iterations = 5, time = 2)
    @Measurement(iterations = 5, time = 2)
    @State(Scope.Thread)
    public static class WithCharset {

        @Param({"US-ASCII", "ISO-8859-1", "UTF-8", "MS932", "ISO-8859-6", "ISO-2022-KR"})
        private String charsetName;

        private Charset charset;
        private byte[] asciiString;
        private byte[] utf16String;

        @Setup
        public void setup() {
            charset = Charset.forName(charsetName);
            asciiString = "ascii string".getBytes(charset);
            utf16String = "UTF-\uFF11\uFF16 string".getBytes(charset);
        }

        @Benchmark
        public void decodeCharsetName(Blackhole bh) throws Exception {
            bh.consume(new String(asciiString, charsetName));
            bh.consume(new String(utf16String, charsetName));
        }

        @Benchmark
        public void decodeCharset(Blackhole bh) throws Exception {
            bh.consume(new String(asciiString, charset));
            bh.consume(new String(utf16String, charset));
        }
    }

    private byte[] asciiDefaultString;
    private byte[] utf16DefaultString;

    @Setup
    public void setup() {
        asciiDefaultString = "ascii string".getBytes();
        utf16DefaultString = "UTF-\uFF11\uFF16 string".getBytes();
    }

    @Benchmark
    public void decodeDefault(Blackhole bh) throws Exception {
        bh.consume(new String(asciiDefaultString));
        bh.consume(new String(utf16DefaultString));
    }
}