real-clock.hpp

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/*
  REAL-CLOCK.hpp  -  convenience front-end to access the system clock

  Copyright (C)         Lumiera.org
    2012,               Hermann Vosseler <Ichthyostega@web.de>

  This program 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 2 of
  the License, or (at your option) any later version.

  This program 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., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#ifndef VAULT_REAL_CLOCK_H
#define VAULT_REAL_CLOCK_H


#include "lib/error.hpp"
#include "lib/time/timevalue.hpp"

namespace vault {

  using lib::time::Time;
  using lib::time::TimeValue;
  using lib::time::Offset;
  
  
  class RealClock
    {
      
      
    public:
      
      static Time
      now()
        {
          return Time{_readSystemTime()};
        }
      
      static bool
      wasRecently (Time event)
        {
          Offset past{event, now()};
          return Time::ZERO <= past
             and past < CONSIDERED_RECENT;
        }
      
      
    private:
      static TimeValue _readSystemTime();
      static const Offset CONSIDERED_RECENT;
    };
  
  
  
} // namespace vault
#endif