content: /*
   * Licensed 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 io.airlift.slice;
  
  import org.openjdk.jmh.annotations.Benchmark;
  import org.openjdk.jmh.annotations.BenchmarkMode;
  import org.openjdk.jmh.annotations.Fork;
  import org.openjdk.jmh.annotations.Level;
  import org.openjdk.jmh.annotations.Measurement;
  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 org.openjdk.jmh.annotations.Warmup;
  import org.openjdk.jmh.runner.Runner;
  import org.openjdk.jmh.runner.options.Options;
  import org.openjdk.jmh.runner.options.OptionsBuilder;
  import org.openjdk.jmh.runner.options.VerboseMode;
  
  import java.util.concurrent.ThreadLocalRandom;
  import java.util.concurrent.TimeUnit;
  
  @SuppressWarnings("MethodMayBeStatic")
  @OutputTimeUnit(TimeUnit.NANOSECONDS)
  @BenchmarkMode(Mode.AverageTime)
  @Fork(5)
  @Warmup(iterations = 5, time = 1000, timeUnit = TimeUnit.MILLISECONDS)
  @Measurement(iterations = 10, time = 1000, timeUnit = TimeUnit.MILLISECONDS)
  public class BenchmarkSlice
  {
      @Benchmark
      public Object compareTo(BenchmarkData data)
      {
          return data.slice1.compareTo(0, data.slice1.length(), data.slice2, 0, data.slice2.length());
      }
  
      @Benchmark
      public Object equalsUnchecked(BenchmarkData data)
      {
          return data.slice1.equalsUnchecked(0, data.slice2, 0, data.slice1.length());
      }
  
      @Benchmark
      public Object equalsObject(BenchmarkData data)
      {
          return data.slice1.equals(data.slice2);
      }
  
      @State(Scope.Thread)
      public static class BenchmarkData
      {
          @Param({"1", "7", "8", "16", "32", "64", "127", "32779"})
          private int size = 1;
  
          private Slice slice1;
          private Slice slice2;
  
          @Setup(Level.Iteration)
          public void setup()
          {
              slice1 = Slices.allocate(size);
              slice2 = Slices.allocate(size);
  
              if (ThreadLocalRandom.current().nextBoolean()) {
                  slice1.setByte(size - 1, 1);
              }
              else {
                  slice2.setByte(size - 1, 1);
              }
          }
      }
  
      public static void main(String[] args)
              throws Throwable
      {
          // assure the benchmarks are valid before running
          BenchmarkData data = new BenchmarkData();
          data.setup();
          new BenchmarkSlice().equalsObject(data);
  
          Options options = new OptionsBuilder()
                  .verbosity(VerboseMode.NORMAL)
                  .include(".*" + BenchmarkSlice.class.getSimpleName() + ".*")
                  .build();
          new Runner(options).run();
      }
  }
  