StringDecode.java

/*
 * Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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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));
    }
}