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.kafka.jmh.util;
  
  import org.apache.kafka.common.utils.Crc32C;
  
  import org.openjdk.jmh.annotations.Benchmark;
  import org.openjdk.jmh.annotations.Fork;
  import org.openjdk.jmh.annotations.Measurement;
  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 java.nio.ByteBuffer;
  import java.util.SplittableRandom;
  import java.util.concurrent.TimeUnit;
  
  @State(Scope.Benchmark)
  @OutputTimeUnit(TimeUnit.MICROSECONDS)
  @Fork(2)
  @Warmup(iterations = 5, time = 1)
  @Measurement(iterations = 10, time = 1)
  public class Crc32CBenchmark {
  
      @Param({"false", "true"})
      private boolean direct;
  
  
      @Param({"false", "true"})
      private boolean readonly;
  
      @Param({"42"})
      private int seed;
  
      @Param({"128", "1024", "4096"})
      private int bytes;
  
      private ByteBuffer input;
  
      @Setup
      public void setup() {
          SplittableRandom random = new SplittableRandom(seed);
          input = direct ? ByteBuffer.allocateDirect(bytes) : ByteBuffer.allocate(bytes);
          for (int o = 0; o < bytes; o++) {
              input.put(o, (byte) random.nextInt(Byte.MIN_VALUE, Byte.MAX_VALUE + 1));
          }
          if (readonly) {
              input = input.asReadOnlyBuffer();
          }
      }
  
      @Benchmark
      public long checksum() {
          return Crc32C.compute(input, 0, bytes);
      }
  
  }
  