Clock.h

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// Copyright 2019-2020 CERN and copyright holders of ALICE O2.
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
// This software is distributed under the terms of the GNU General Public
// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
//
// In applying this license CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
 
/*
 * File:   Clock.hpp
 * Author: John Lång (john.larry.lang@cern.ch)
 *
 * Created on 29 August 2016, 9:29
 */
#ifndef O2_DCS_CLOCK_H
#define O2_DCS_CLOCK_H
 
#include <ctime>
#include <cstdint>
#include <chrono>
#include <memory>
#include <string>
 
namespace o2
{
namespace dcs
{
inline uint64_t time_since(
  const std::chrono::steady_clock::time_point beginning) noexcept
{
  return std::chrono::duration_cast<std::chrono::milliseconds>(
           std::chrono::steady_clock::now() - beginning)
    .count();
}
 
inline uint64_t epoch_time() noexcept
{
  return std::chrono::duration_cast<std::chrono::milliseconds>(
           std::chrono::system_clock::now().time_since_epoch())
    .count();
}
 
inline uint64_t now() noexcept
{
  return std::chrono::duration_cast<std::chrono::milliseconds>(
           std::chrono::steady_clock::now().time_since_epoch())
    .count();
}
 
inline std::string timestamp() noexcept
{
  char buffer[20];
  std::time_t now = std::time(nullptr);
  std::strftime(buffer, 32, "%F %T", std::localtime(&now));
  return std::string(buffer);
}
 
inline std::string timestamp(const std::string& format) noexcept
{
  char buffer[20];
  std::time_t now = std::time(nullptr);
  std::strftime(buffer, 32, format.c_str(), std::localtime(&now));
  return std::string(buffer);
}
 
inline std::string fs_timestamp() noexcept
{
  char buffer[20];
  std::time_t now = std::time(nullptr);
  std::strftime(buffer, 32, "%F_%H.%M.%S", std::localtime(&now));
  return std::string(buffer);
}
} // namespace dcs
} // namespace o2
 
#endif /* O2_DCS_CLOCK_H */