code: def __find_handler_factories(self):
          
          # Get the references
          svc_refs = self.__context.get_all_service_references(
              handlers_const.SERVICE_IPOPO_HANDLER_FACTORY
          )
          if svc_refs:
              for svc_ref in svc_refs:
                  # Store each handler factory
                  self.__add_handler_factory(svc_ref)
docs: Finds all registered handler factories and stores them