/*

         typedef boost::circular_buffer< Event > Event_buffer;
         typedef std::map< std::string, Event_config > Event_config_map;

         typedef std::set< std::string > Set_of_sources;
         typedef std::map< std::string, Set_of_sources > Active_events_map;

         /** Event id => event configuration */
         Event_config_map event_config;

         /** Event id => set of sources */
         Active_events_map active_events;
*/

   Event_severity Event_logger::highest_active_event_severity()
   {
      Event_severity highest_severity = cleared;
      BOOST_FOREACH( const Active_events_map::value_type& event, active_events )
      {
         Event_severity event_severity = event_config[ event.first ].severity;
         if( event_severity < highest_severity )
         {
            highest_severity = event_severity;
         }
      }

      return highest_severity;
   }