/*
    * Copyright 2017 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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 io.netty.handler.codec.http;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.ByteBufUtil;
  import io.netty.buffer.Unpooled;
  import io.netty.microbench.util.AbstractMicrobenchmark;
  import org.openjdk.jmh.annotations.Benchmark;
  import org.openjdk.jmh.annotations.Measurement;
  import org.openjdk.jmh.annotations.OutputTimeUnit;
  import org.openjdk.jmh.annotations.Threads;
  import org.openjdk.jmh.annotations.Warmup;
  
  import java.util.concurrent.TimeUnit;
  
  import static io.netty.handler.codec.http.HttpConstants.*;
  
  @Threads(1)
  @Warmup(iterations = 3)
  @Measurement(iterations = 3)
  @OutputTimeUnit(TimeUnit.MICROSECONDS)
  public class WriteBytesVsShortOrMediumBenchmark extends AbstractMicrobenchmark {
      private static final int CRLF_SHORT = (CR << 8) + LF;
      private static final byte[] CRLF = { CR, LF };
      private static final int ZERO_CRLF_MEDIUM = ('0' << 16) + (CR << 8) + LF;
      private static final byte[] ZERO_CRLF = { '0', CR, LF };
  
      private final ByteBuf buf = Unpooled.directBuffer(16);
  
      @Benchmark
      public ByteBuf shortInt() {
          return ByteBufUtil.writeShortBE(buf, CRLF_SHORT).resetWriterIndex();
      }
  
      @Benchmark
      public ByteBuf mediumInt() {
          return ByteBufUtil.writeMediumBE(buf, ZERO_CRLF_MEDIUM).resetWriterIndex();
      }
  
      @Benchmark
      public ByteBuf byteArray2() {
          return buf.writeBytes(CRLF).resetWriterIndex();
      }
  
      @Benchmark
      public ByteBuf byteArray3() {
          return buf.writeBytes(ZERO_CRLF).resetWriterIndex();
      }
  
      @Benchmark
      public ByteBuf chainedBytes2() {
          return buf.writeByte(CR).writeByte(LF).resetWriterIndex();
      }
  
      @Benchmark
      public ByteBuf chainedBytes3() {
          return buf.writeByte('0').writeByte(CR).writeByte(LF).resetWriterIndex();
      }
  }