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.arrow.vector.ipc;
  
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.nio.channels.Channels;
  import java.util.concurrent.TimeUnit;
  import org.openjdk.jmh.annotations.Benchmark;
  import org.openjdk.jmh.annotations.BenchmarkMode;
  import org.openjdk.jmh.annotations.Level;
  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.TearDown;
  import org.openjdk.jmh.runner.Runner;
  import org.openjdk.jmh.runner.RunnerException;
  import org.openjdk.jmh.runner.options.Options;
  import org.openjdk.jmh.runner.options.OptionsBuilder;
  
  /** Benchmarks for {@link WriteChannel}. */
  public class WriteChannelBenchmark {
    // checkstyle:off: MissingJavadocMethod
  
    /** State object for align benchmark. */
    @State(Scope.Benchmark)
    public static class AlignState {
  
      private ByteArrayOutputStream baos;
  
      private WriteChannel writeChannel;
  
      @Param({"1", "2", "3", "4", "5", "6", "7"})
      public int alignSize;
  
      @Setup(Level.Invocation)
      public void prepareInvoke() throws IOException {
        baos = new ByteArrayOutputStream(8);
        writeChannel = new WriteChannel(Channels.newChannel(baos));
        writeChannel.write(new byte[8 - alignSize]);
      }
  
      @TearDown(Level.Invocation)
      public void tearDownInvoke() throws IOException {
        writeChannel.close();
        baos.close();
      }
    }
  
    @Benchmark
    @BenchmarkMode(Mode.AverageTime)
    @OutputTimeUnit(TimeUnit.NANOSECONDS)
    public void alignBenchmark(AlignState state) throws IOException {
      state.writeChannel.align();
    }
  
    public static void main(String[] args) throws RunnerException {
      Options opt =
          new OptionsBuilder().include(WriteChannelBenchmark.class.getSimpleName()).forks(1).build();
  
      new Runner(opt).run();
    }
    // checkstyle:on: MissingJavadocMethod
  }
  