logger.hh

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// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
 
// SPDX-FileCopyrightText: Copyright © DUNE-FUFEM Project contributors, see file AUTHORS.md
// SPDX-License-Identifier: LicenseRef-GPL-2.0-only-with-DUNE-exception OR LGPL-3.0-or-later
 
#ifndef DUNE_FUFEM_LOGGER_HH
#define DUNE_FUFEM_LOGGER_HH
 
#include <chrono>
#include <mutex>
#include <string>
 
#include <dune/common/stringutility.hh>
 
namespace Dune::Fufem {
 
template<class Duration=std::chrono::duration<double>>
auto makeLogger(std::ostream& stream, std::string format)
{
  auto startTimeStamp = std::chrono::high_resolution_clock::now();
  auto lastTimeStamp = std::chrono::high_resolution_clock::now();
  return [&, format, startTimeStamp, lastTimeStamp] (auto&& s) mutable {
    using namespace std::chrono;
    auto newTimeStamp = high_resolution_clock::now();
    stream
      << Dune::formatString( format,
        duration_cast<Duration>(newTimeStamp - startTimeStamp),
        duration_cast<Duration>(newTimeStamp - lastTimeStamp))
      << s << std::endl;
    lastTimeStamp = newTimeStamp;
  };
}
 
 
 
template<class Duration=std::chrono::duration<double>>
auto makeSynchronizedLogger(std::ostream& stream, std::string format, std::mutex& mutex)
{
  auto rawLogger=makeLogger<Duration>(stream, format);
  return [rawLogger,&mutex](auto&& s) mutable {
    auto lock = std::unique_lock(mutex);
    rawLogger(s);
  };
}
 
} // namespace Dune::Fufem
 
#endif // DUNE_FUFEM_LOGGER_HH