1 /*
   2  * Copyright (c) 2014 Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package org.openjdk.bench.java.nio;
  24 
  25 import org.openjdk.jmh.annotations.Benchmark;
  26 import org.openjdk.jmh.annotations.BenchmarkMode;
  27 import org.openjdk.jmh.annotations.Mode;
  28 import org.openjdk.jmh.annotations.OutputTimeUnit;
  29 import org.openjdk.jmh.annotations.Param;
  30 import org.openjdk.jmh.annotations.Scope;
  31 import org.openjdk.jmh.annotations.Setup;
  32 import org.openjdk.jmh.annotations.State;
  33 
  34 import java.nio.ByteBuffer;
  35 import java.nio.CharBuffer;
  36 import java.nio.charset.CharacterCodingException;
  37 import java.nio.charset.Charset;
  38 import java.nio.charset.CharsetDecoder;
  39 import java.nio.charset.CharsetEncoder;
  40 import java.util.concurrent.TimeUnit;
  41 
  42 /**
  43  * This benchmark tests the encode/decode loops on different Charsets. It was created from an adhoc benchmark addressing
  44  * a performance issue which in the end boiled down to the encode/decode loops. This is the reason for the values on the
  45  * char and byte arrays.
  46  */
  47 @BenchmarkMode(Mode.AverageTime)
  48 @OutputTimeUnit(TimeUnit.MICROSECONDS)
  49 @State(Scope.Thread)
  50 public class CharsetEncodeDecode {
  51 
  52     private byte[] BYTES;
  53     private char[] CHARS;
  54 
  55     private CharsetEncoder encoder;
  56     private CharsetDecoder decoder;
  57 
  58     @Param({"BIG5", "ISO-8859-15", "ASCII", "UTF-16"})
  59     private String type;
  60 
  61     @Param("16384")
  62     private int size;
  63 
  64     @Setup
  65     public void prepare() {
  66         BYTES = new byte[size];
  67         CHARS = new char[size];
  68         for (int i = 0; i < size; ++i) {
  69             int val = 48 + (i % 16);
  70             BYTES[i] = (byte) val;
  71             CHARS[i] = (char) val;
  72         }
  73 
  74         encoder = Charset.forName(type).newEncoder();
  75         decoder = Charset.forName(type).newDecoder();
  76     }
  77 
  78     @Benchmark
  79     public ByteBuffer encode() throws CharacterCodingException {
  80         CharBuffer charBuffer = CharBuffer.wrap(CHARS);
  81         return encoder.encode(charBuffer);
  82     }
  83 
  84     @Benchmark
  85     public CharBuffer decode() throws CharacterCodingException {
  86         ByteBuffer byteBuffer = ByteBuffer.wrap(BYTES);
  87         return decoder.decode(byteBuffer);
  88     }
  89 
  90 }