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   * 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;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.atomic.AtomicLongArray;
  
  import org.apache.cassandra.metrics.Meter;
  import org.apache.cassandra.metrics.ThreadLocalMeter;
  import org.openjdk.jmh.annotations.Benchmark;
  import org.openjdk.jmh.annotations.BenchmarkMode;
  import org.openjdk.jmh.annotations.Fork;
  import org.openjdk.jmh.annotations.Level;
  import org.openjdk.jmh.annotations.Measurement;
  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.Threads;
  import org.openjdk.jmh.annotations.Warmup;
  
  @BenchmarkMode(Mode.AverageTime)
  @OutputTimeUnit(TimeUnit.NANOSECONDS)
  @Warmup(iterations = 4, time = 10, timeUnit = TimeUnit.SECONDS)
  @Measurement(iterations = 8, time = 10, timeUnit = TimeUnit.SECONDS)
  @Fork(value = 2,
  jvmArgsAppend = { "-Djmh.executor=CUSTOM", "-Djmh.executor.class=org.apache.cassandra.test.microbench.FastThreadExecutor"})
  @Threads(4)
  @State(Scope.Benchmark)
  public class MetersBench
  {
      @Param({ "ThreadLocal", "Dropwizard"})
      private String type;
  
      @Param({"10"})
      private int metricsCount;
  
      @Param({"true"})
      private boolean polluteCpuCaches;
  
      private List<Meter> meters;
  
      @Setup(Level.Trial)
      public void setup() throws Throwable
      {
          meters = new ArrayList<>(metricsCount);
          for (int i = 0; i < metricsCount; i++)
          {
              Meter meter;
              switch (type)
              {
                  case "ThreadLocal":
                      meter = new ThreadLocalMeter();
                      break;
                  case "Dropwizard":
                      meter = new DropwizardMeter();
                      break;
                  default:
                      throw new UnsupportedOperationException();
              }
              meters.add(meter);
          }
      }
  
      private final AtomicLongArray anotherMemory = new AtomicLongArray(256 * 1024);
  
      @Setup(Level.Invocation)
      public void polluteCpuCaches()
      {
          if (polluteCpuCaches)
              for (int i = 0; i < anotherMemory.length(); i++)
                  anotherMemory.incrementAndGet(i);
      }
  
      @Benchmark
      public void mark() {
          for (Meter meter : meters)
              meter.mark();
      }
  
      private static class DropwizardMeter implements Meter
      {
          private final com.codahale.metrics.Meter meter = new com.codahale.metrics.Meter();
  
          @Override
          public void mark()
          {
              meter.mark();
          }
  
          @Override
          public void mark(long n)
          {
              meter.mark(n);
          }
  
          @Override
          public long getCount()
          {
              return meter.getCount();
          }
  
          @Override
          public double getFifteenMinuteRate()
          {
              return meter.getFifteenMinuteRate();
          }
  
          @Override
          public double getFiveMinuteRate()
          {
              return meter.getFiveMinuteRate();
          }
  
          @Override
          public double getMeanRate()
          {
              return meter.getMeanRate();
          }
  
          @Override
          public double getOneMinuteRate()
          {
              return meter.getOneMinuteRate();
          }
      }
  }
  