content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF 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
   *
   *     http://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 org.apache.cassandra.test.microbench;
  
  import java.util.concurrent.TimeUnit;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.ByteBufUtil;
  import io.netty.buffer.Unpooled;
  import org.apache.cassandra.db.TypeSizes;
  import org.apache.cassandra.transport.CBUtil;
  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.Scope;
  import org.openjdk.jmh.annotations.State;
  import org.openjdk.jmh.annotations.Warmup;
  
  @BenchmarkMode(Mode.AverageTime)
  @OutputTimeUnit(TimeUnit.NANOSECONDS)
  @Warmup(iterations = 3, time = 1)
  @Measurement(iterations = 6, time = 20)
  @Fork(value = 1, jvmArgsAppend = { "-Xmx256M", "-Djmh.executor=CUSTOM", "-Djmh.executor.class=org.apache.cassandra.test.microbench.FastThreadExecutor"})
  @State(Scope.Benchmark)
  public class StringsEncodeBench
  {
      private String shortText = "abcdefghijk";
      private String longText = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.";
      private int shortTextEncodeSize = CBUtil.sizeOfString(shortText);
      private int longTextEncodeSize = CBUtil.sizeOfString(longText);
  
      @Benchmark
      public int writeShortText() // expecting resize
      {
          ByteBuf cb = Unpooled.buffer(shortTextEncodeSize);
          cb.writeShort(0); // field for str length
          return ByteBufUtil.writeUtf8(cb, shortText);
      }
  
      @Benchmark
      public int writeShortTextWithExactSize() // no resize
      {
          ByteBuf cb = Unpooled.buffer(shortTextEncodeSize);
          int size = TypeSizes.encodedUTF8Length(shortText);
          cb.writeShort(size); // field for str length
          return ByteBufUtil.reserveAndWriteUtf8(cb, shortText, size);
      }
  
      @Benchmark
      public int writeShortTextWithExactSizeSkipCalc() // no resize; from the encodeSize, we already know the amount of bytes required.
      {
          ByteBuf cb = Unpooled.buffer(shortTextEncodeSize);
          cb.writeShort(0); // field for str length
          int size = cb.capacity() - cb.writerIndex(); // leverage the pre-calculated encodeSize
          return ByteBufUtil.reserveAndWriteUtf8(cb, shortText, size);
      }
  
      @Benchmark
      public void writeShortTextAsASCII()
      {
          ByteBuf cb = Unpooled.buffer(shortTextEncodeSize);
          CBUtil.writeAsciiString(shortText, cb);
      }
  
      @Benchmark
      public int writeLongText() // expecting resize
      {
          ByteBuf cb = Unpooled.buffer(longTextEncodeSize);
          cb.writeShort(0); // field for str length
          return ByteBufUtil.writeUtf8(cb, longText);
      }
  
      @Benchmark
      public int writeLongTextWithExactSize() // no resize
      {
          ByteBuf cb = Unpooled.buffer(longTextEncodeSize);
          int size = TypeSizes.encodedUTF8Length(longText);
          cb.writeShort(size); // field for str length
          return ByteBufUtil.reserveAndWriteUtf8(cb, longText, size);
      }
  
      @Benchmark
      public int writeLongTextWithExactSizeSkipCalc() // no resize
      {
          ByteBuf cb = Unpooled.buffer(longTextEncodeSize);
          cb.writeShort(0); // field for str length
          int size = cb.capacity() - cb.writerIndex(); // leverage the pre-calculated encodeSize
          return ByteBufUtil.reserveAndWriteUtf8(cb, longText, size);
      }
  
      @Benchmark
      public void writeLongTextAsASCII()
      {
          ByteBuf cb = Unpooled.buffer(longTextEncodeSize);
          CBUtil.writeAsciiString(longText, cb);
      }
  
      @Benchmark
      public int sizeOfString()
      {
          return CBUtil.sizeOfString(longText);
      }
  
      @Benchmark
      public int sizeOfAsciiString()
      {
          return CBUtil.sizeOfAsciiString(longText);
      }
  }
  