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.btree;
  
  import java.util.Comparator;
  import java.util.List;
  import java.util.concurrent.TimeUnit;
  
  import org.apache.cassandra.utils.BulkIterator;
  import org.apache.cassandra.utils.btree.BTree;
  import org.apache.cassandra.utils.btree.UpdateFunction;
  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.Threads;
  import org.openjdk.jmh.annotations.Warmup;
  
  @BenchmarkMode(Mode.Throughput)
  @OutputTimeUnit(TimeUnit.MILLISECONDS)
  @Warmup(iterations = 6, time = 1, timeUnit = TimeUnit.SECONDS)
  @Measurement(iterations = 8, time = 2, timeUnit = TimeUnit.SECONDS)
  @Fork(value = 2)
  @Threads(4)
  @State(Scope.Benchmark)
  public class BTreeBuildBench extends BTreeBench
  {
      @Benchmark
      public Object[] buildWithIterableStaticBuildMethod(BuildSizeState state)
      {
          List<Integer> list;
          int size = state.next();
          switch (state.i() % 3)
          {
              case 0: list = dataAsIterable1; break;
              case 1: list = dataAsIterable2; break;
              case 2: list = dataAsIterable3; break;
              default: throw new IllegalStateException();
          }
          return BTree.build(BulkIterator.of(list.iterator()), size, UpdateFunction.noOp());
      }
  
      @Benchmark
      public Object[] buildWithMegamorphicBulkStaticBuildNoop(BuildSizeState state)
      {
          return buildWithMegamorphicBulkStaticBuild(state, UpdateFunction.noOp());
      }
  
      public Object[] buildWithMegamorphicBulkStaticBuild(BuildSizeState state, UpdateFunction<Integer, Integer> updateF)
      {
          BulkIterator<Integer> iter;
          int size = state.next();
          switch (state.i() % 3)
          {
              case 0: iter = BulkIterator.of(data); break;
              case 1: iter = FromArrayCopy.of(data); break;
              case 2: iter = FromArrayCopy2.of(data); break;
              default: throw new IllegalStateException();
          }
          Object[] result = BTree.build(iter, size, updateF);
          iter.close();
          return result;
      }
  
      @Benchmark
      public Object[] buildWithBulkStaticBuild(BuildSizeState state)
      {
          int size = state.next();
          try (BulkIterator<Integer> iter = BulkIterator.of(data))
          {
              return BTree.build(iter, size, UpdateFunction.noOp());
          }
      }
  
      @Benchmark
      public Object[] buildWithBuilderAuto(BuildSizeState state)
      {
          int size = state.next();
          BTree.Builder<Integer> builder = BTree.builder(Comparator.naturalOrder());
          for (int i = 0 ; i < size ; ++i)
              builder.add(data[i]);
          return builder.build();
      }
  
      @Benchmark
      public Object[] buildWithBuilderManual(BuildSizeState state)
      {
          int size = state.next();
          BTree.Builder<Integer> builder = BTree.builder(Comparator.naturalOrder());
          builder.auto(false);
          for (int i = 0 ; i < size ; ++i)
              builder.add(data[i]);
          return builder.build();
      }
  
      @Benchmark
      public Object[] buildWithFastBuilder(BuildSizeState state)
      {
          int size = state.next();
          try (BTree.FastBuilder<Integer> builder = BTree.fastBuilder())
          {
              for (int i = 0 ; i < size ; ++i)
                  builder.add(data[i]);
              return builder.build();
          }
      }
  }