subsys.hpp

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/*
  SUBSYS.hpp  -  interface for describing an application part to be handled by main()

  Copyright (C)         Lumiera.org
    2008,               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 LUMIERA_SUBSYS_H
#define LUMIERA_SUBSYS_H

#include "lib/error.hpp"
#include "lib/nocopy.hpp"

#include <functional>
#include <string>
#include <vector>



namespace lumiera {
  
  using std::string;
  using std::function;
  
  class Option;
  
  
  
  class Subsys
    : util::NonCopyable
    {
    public:
      typedef function<void(string*)> SigTerm;
      
      virtual ~Subsys();
      
      virtual operator string()  const =0;

      
      Subsys& depends (Subsys& prereq);
      
      bool isRunning()  noexcept;
      
      
      virtual bool shouldStart (lumiera::Option&)  =0;
      
      
      virtual bool start (lumiera::Option& options, SigTerm)  =0;
      
      
      virtual void triggerShutdown()  noexcept  =0;
      
      
      const std::vector<Subsys*>
      getPrerequisites() { return prereq_; }
      
      
    private:
      virtual bool checkRunningState()  noexcept =0;
      
      std::vector<Subsys*> prereq_;
    };
  
  
  
} // namespace lumiera

#endif