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;
  
  import java.util.concurrent.TimeUnit;
  import org.apache.arrow.memory.BufferAllocator;
  import org.apache.arrow.memory.RootAllocator;
  import org.apache.arrow.vector.ipc.message.ArrowRecordBatch;
  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.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 VectorLoader}. */
  public class VectorLoaderBenchmark {
    // checkstyle:off: MissingJavadocMethod
  
    private static final int ALLOCATOR_CAPACITY = 1024 * 1024;
  
    private static final int VECTOR_COUNT = 10;
  
    /** State for vector load benchmark. */
    @State(Scope.Benchmark)
    public static class LoadState {
  
      private BufferAllocator allocator;
  
      private VarCharVector[] vectors;
  
      private ArrowRecordBatch recordBatch;
  
      private VectorSchemaRoot root;
  
      private VectorLoader loader;
  
      /** Setup benchmarks. */
      @Setup(Level.Trial)
      public void prepare() {
        allocator = new RootAllocator(ALLOCATOR_CAPACITY);
      }
  
      @Setup(Level.Invocation)
      public void prepareInvoke() {
        vectors = new VarCharVector[VECTOR_COUNT];
        for (int i = 0; i < VECTOR_COUNT; i++) {
          vectors[i] = new VarCharVector("vector", allocator);
          vectors[i].allocateNew(100, 10);
        }
  
        root = VectorSchemaRoot.of(vectors);
        VectorUnloader unloader = new VectorUnloader(root);
        recordBatch = unloader.getRecordBatch();
  
        loader = new VectorLoader(root);
      }
  
      @TearDown(Level.Invocation)
      public void tearDownInvoke() {
        recordBatch.close();
        root.close();
      }
  
      /** Tear down benchmarks. */
      @TearDown(Level.Trial)
      public void tearDown() {
        allocator.close();
      }
    }
  
    @Benchmark
    @BenchmarkMode(Mode.AverageTime)
    @OutputTimeUnit(TimeUnit.MICROSECONDS)
    public void loadBenchmark(LoadState state) {
      state.loader.load(state.recordBatch);
    }
  
    public static void main(String[] args) throws RunnerException {
      Options opt =
          new OptionsBuilder().include(VectorLoaderBenchmark.class.getSimpleName()).forks(1).build();
  
      new Runner(opt).run();
    }
    // checkstyle:on: MissingJavadocMethod
  }
  