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.stats;
  
  import java.util.HashMap;
  import java.util.Map;
  import java.util.concurrent.TimeUnit;
  import java.util.function.Supplier;
  import org.apache.bookkeeper.stats.codahale.CodahaleMetricsProvider;
  import org.apache.bookkeeper.stats.codahale.FastCodahaleMetricsProvider;
  import org.apache.bookkeeper.stats.prometheus.PrometheusMetricsProvider;
  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.Threads;
  import org.openjdk.jmh.annotations.Warmup;
  
  /**
   * Microbenchmarks for different stats backend providers.
   */
  @OutputTimeUnit(TimeUnit.MICROSECONDS)
  @Threads(16)
  @Fork(1)
  @Warmup(iterations = 1, time = 10, timeUnit = TimeUnit.SECONDS)
  @Measurement(iterations = 3, time = 10, timeUnit = TimeUnit.SECONDS)
  public class StatsLoggerBenchmark {
  
      private static Map<String, Supplier<StatsProvider>> providers = new HashMap<>();
  
      static {
          providers.put("Prometheus", PrometheusMetricsProvider::new);
          providers.put("Codahale", CodahaleMetricsProvider::new);
          providers.put("FastCodahale", FastCodahaleMetricsProvider::new);
      }
  
      /**
       * State holder of the logger.
       */
      @State(Scope.Benchmark)
      public static class LoggerState {
          @Param({"Prometheus", "Codahale", "FastCodahale", "Twitter", "Ostrich"})
          private String statsProvider;
  
          private Counter counter;
          private OpStatsLogger opStats;
  
          private long startTime = System.nanoTime();
  
          @Setup(Level.Trial)
          public void setup() {
              StatsProvider provider = providers.get(statsProvider).get();
              StatsLogger logger = provider.getStatsLogger("test");
              counter = logger.getCounter("counter");
              opStats = logger.getOpStatsLogger("opstats");
          }
      }
  
      @Benchmark
      public void counterIncrement(LoggerState s) {
          s.counter.inc();
      }
  
      @Benchmark
      public void recordLatency(LoggerState s) {
          s.opStats.registerSuccessfulValue(System.nanoTime() - s.startTime);
      }
  }
  