subsys.hpp

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

   Copyright (C)
     2008,            Hermann Vosseler <Ichthyostega@web.de>

  **Lumiera** 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. See the file COPYING for further details.

*/

#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