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