/*
    * 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.commons.monitoring.counters;
  
  import org.apache.commons.monitoring.Role;
  import org.apache.commons.monitoring.store.DefaultDataStore;
  import org.junit.Test;
  
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  import java.util.concurrent.TimeUnit;
  
  import static org.junit.Assert.assertEquals;
  
  public class CounterBench implements Runnable {
      private static final int THREADS = 30;
      private static final int LOOPS = 20000000;
  
      private Counter counter;
      private String mode;
  
      @Test
      public void defaultCounter() throws Exception {
          mode = "RentrantLockCounter";
          counter = new DefaultCounter(new Counter.Key(Role.FAILURES, mode), new DefaultDataStore());
          runConcurrent();
      }
  
      private void runConcurrent() throws InterruptedException {
          final long start = System.nanoTime();
          final ExecutorService pool = Executors.newFixedThreadPool(THREADS);
          for (int i = 0; i < LOOPS; i++) {
              pool.submit(this);
          }
          pool.shutdown();
          pool.awaitTermination(60, TimeUnit.SECONDS);
  
          final long duration = System.nanoTime() - start;
          System.out.printf("%s : %,d ns/operation %n\n", mode, duration / LOOPS);
          assertEquals(LOOPS, counter.getSum(), 0);
  
      }
  
      public void run() {
          counter.add(1, Unit.UNARY);
      }
  }