plugin.hpp

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#pragma once
#include <boost/program_options.hpp>
#include <boost/preprocessor/seq/for_each.hpp>
#include <string>
#include <vector>
#include <map>
 
#define APPBASE_PLUGIN_REQUIRES_VISIT( r, visitor, elem ) \
  visitor( appbase::app().register_plugin<elem>() ); 
 
#define APPBASE_PLUGIN_REQUIRES( PLUGINS )                               \
   template<typename Lambda>                                           \
   void plugin_requires( Lambda&& l ) {                                \
      BOOST_PP_SEQ_FOR_EACH( APPBASE_PLUGIN_REQUIRES_VISIT, l, PLUGINS ) \
   }
 
namespace appbase {
 
   using boost::program_options::options_description;
   using boost::program_options::variables_map;
   using std::string;
   using std::vector;
   using std::map;
 
   class application;
   application& app();
 
   class abstract_plugin {
      public:
         enum state {
            registered, 
            initialized, 
            started, 
            stopped 
         };
 
         virtual ~abstract_plugin(){}
         virtual state get_state()const = 0;
         virtual const std::string& name()const  = 0;
         virtual void set_program_options( options_description& cli, options_description& cfg ) = 0;
         virtual void initialize(const variables_map& options) = 0;
         virtual void handle_sighup() = 0;
         virtual void startup() = 0;
         virtual void shutdown() = 0;
   };
 
   template<typename Impl>
   class plugin;
}