/*

 * Copyright (c) 2014 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package org.openjdk.bench.java.nio;

import org.openjdk.jmh.annotations.Benchmark;

import org.openjdk.jmh.annotations.BenchmarkMode;

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 java.nio.ByteBuffer;

import java.nio.CharBuffer;

import java.nio.charset.CharacterCodingException;

import java.nio.charset.Charset;

import java.nio.charset.CharsetDecoder;

import java.nio.charset.CharsetEncoder;

import java.util.concurrent.TimeUnit;

/**

 * This benchmark tests the encode/decode loops on different Charsets. It was created from an adhoc benchmark addressing

 * a performance issue which in the end boiled down to the encode/decode loops. This is the reason for the values on the

 * char and byte arrays.

 */

@BenchmarkMode(Mode.AverageTime)

@OutputTimeUnit(TimeUnit.MICROSECONDS)

@State(Scope.Thread)

public class CharsetEncodeDecode {

    private byte[] BYTES;

    private char[] CHARS;

    private CharsetEncoder encoder;

    private CharsetDecoder decoder;

    @Param({"BIG5", "ISO-8859-15", "ASCII", "UTF-16"})

    private String type;

    @Param("16384")

    private int size;

    @Setup

    public void prepare() {

        BYTES = new byte[size];

        CHARS = new char[size];

        for (int i = 0; i < size; ++i) {

            int val = 48 + (i % 16);

            BYTES[i] = (byte) val;

            CHARS[i] = (char) val;

        }

        encoder = Charset.forName(type).newEncoder();

        decoder = Charset.forName(type).newDecoder();

    }

    @Benchmark

    public ByteBuffer encode() throws CharacterCodingException {

        CharBuffer charBuffer = CharBuffer.wrap(CHARS);

        return encoder.encode(charBuffer);

    }

    @Benchmark

    public CharBuffer decode() throws CharacterCodingException {

        ByteBuffer byteBuffer = ByteBuffer.wrap(BYTES);

        return decoder.decode(byteBuffer);

    }

}