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.bookkeeper.common;
  
  import com.google.common.collect.ImmutableMap;
  import java.util.Map;
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  import java.util.concurrent.TimeUnit;
  import java.util.function.Supplier;
  import org.apache.bookkeeper.common.util.OrderedExecutor;
  import org.apache.bookkeeper.common.util.OrderedScheduler;
  import org.openjdk.jmh.annotations.Benchmark;
  import org.openjdk.jmh.annotations.Fork;
  import org.openjdk.jmh.annotations.Level;
  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.TearDown;
  import org.openjdk.jmh.annotations.Threads;
  import org.openjdk.jmh.annotations.Warmup;
  
  /**
   * Microbenchmarks for different executors providers.
   */
  @OutputTimeUnit(TimeUnit.MILLISECONDS)
  @Threads(16)
  @Fork(1)
  @Warmup(iterations = 1, time = 10, timeUnit = TimeUnit.SECONDS)
  @Measurement(iterations = 3, time = 10, timeUnit = TimeUnit.SECONDS)
  public class OrderedExecutorBenchmark {
  
      private static Map<String, Supplier<ExecutorService>> providers = ImmutableMap.of(
              "JDK-ThreadPool", () -> Executors.newFixedThreadPool(1),
              "OrderedExecutor", () -> OrderedExecutor.newBuilder().numThreads(1).build(),
              "OrderedScheduler", () -> OrderedScheduler.newSchedulerBuilder().numThreads(1).build());
  
      /**
       * State holder of the test.
      */
      @State(Scope.Benchmark)
      public static class TestState {
          @Param({"JDK-ThreadPool", "OrderedExecutor", "OrderedScheduler"})
          private String executorName;
  
          private ExecutorService executor;
  
          @Setup(Level.Trial)
          public void setup() {
              executor = providers.get(executorName).get();
          }
  
          @TearDown(Level.Trial)
          public void teardown() {
              executor.shutdown();
          }
      }
  
      @Benchmark
      public void submitAndWait(TestState s) throws Exception {
          s.executor.submit(() -> {
          }).get();
      }
  }
  