Stopwatch.h

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/*
 * Copyright (C) 2007-2015 Hypertable, Inc.
 *
 * This file is part of Hypertable.
 *
 * Hypertable is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 3
 * of the License, or any later version.
 *
 * Hypertable is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */


#ifndef Common_Stopwatch_h
#define Common_Stopwatch_h

#include <chrono>
#include <cstring>

namespace Hypertable {


  class Stopwatch {
  public:
    Stopwatch(bool start_running = true) {
      if (start_running)
        start();
    }

    void start() {
      if (!m_running) {
        start_time = std::chrono::steady_clock::now();
        m_running = true;
      }
    }

    void stop() {
      if (m_running) {
        elapsed_time += std::chrono::steady_clock::now() - start_time;
        m_running = false;
      }
    }

    void reset() {
      elapsed_time = std::chrono::steady_clock::duration::zero();
    }

    double elapsed() {
      if (m_running) {
        stop();
        start();
      }
      return ((double)elapsed_time.count() *
              std::chrono::steady_clock::duration::period::num) /
        (double)std::chrono::steady_clock::duration::period::den;
    }

    int64_t elapsed_millis() {
      if (m_running) {
        stop();
        start();
      }
      return std::chrono::duration_cast<std::chrono::milliseconds>(elapsed_time).count();
    }

  private:
    bool m_running {};

    std::chrono::steady_clock::time_point start_time;

    std::chrono::steady_clock::duration elapsed_time {0};
  };


}

#endif // Common_Stopwatch_h