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   /*
    * Copyright 2019 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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.netty.util.concurrent;
  
  import java.util.concurrent.Callable;
  import java.util.concurrent.TimeUnit;
  
  import org.openjdk.jmh.annotations.Benchmark;
  import org.openjdk.jmh.annotations.Level;
  import org.openjdk.jmh.annotations.Measurement;
  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;
  
  import io.netty.channel.nio.NioEventLoopGroup;
  import io.netty.microbench.util.AbstractMicrobenchmark;
  
  @Warmup(iterations = 5, time = 3, timeUnit = TimeUnit.SECONDS)
  @Measurement(iterations = 10, time = 3, timeUnit = TimeUnit.SECONDS)
  @State(Scope.Benchmark)
  public class ScheduleFutureTaskBenchmark extends AbstractMicrobenchmark {
  
      static final Callable<Void> NO_OP = new Callable<Void>() {
          @Override
          public Void call() throws Exception {
              return null;
          }
      };
  
      @State(Scope.Thread)
      public static class ThreadState {
  
          @Param({ "100000" })
          int num;
  
          AbstractScheduledEventExecutor eventLoop;
  
          @Setup(Level.Trial)
          public void reset() {
              eventLoop = (AbstractScheduledEventExecutor) new NioEventLoopGroup(1).next();
          }
  
          @Setup(Level.Invocation)
          public void clear() {
              eventLoop.submit(new Runnable() {
                  @Override
                  public void run() {
                      eventLoop.cancelScheduledTasks();
                  }
              }).awaitUninterruptibly();
          }
  
          @TearDown(Level.Trial)
          public void shutdown() {
              clear();
              eventLoop.parent().shutdownGracefully().awaitUninterruptibly();
          }
      }
  
      @Benchmark
      @Threads(3)
      public Future<?> scheduleLots(final ThreadState threadState) {
          return threadState.eventLoop.submit(new Runnable() {
              @Override
              public void run() {
                  for (int i = 1; i <= threadState.num; i++) {
                      threadState.eventLoop.schedule(NO_OP, i, TimeUnit.HOURS);
                  }
              }
          }).syncUninterruptibly();
      }
  
      @Benchmark
      @Threads(1)
      public Future<?> scheduleLotsOutsideLoop(final ThreadState threadState) {
          final AbstractScheduledEventExecutor eventLoop = threadState.eventLoop;
          for (int i = 1; i <= threadState.num; i++) {
              eventLoop.schedule(NO_OP, i, TimeUnit.HOURS);
          }
          return null;
      }
  
     @Benchmark
     @Threads(1)
     public Future<?> scheduleCancelLotsOutsideLoop(final ThreadState threadState) {
         final AbstractScheduledEventExecutor eventLoop = threadState.eventLoop;
         for (int i = 1; i <= threadState.num; i++) {
             eventLoop.schedule(NO_OP, i, TimeUnit.HOURS).cancel(false);
         }
         return null;
     }
 }