code: def _register_service(self):
          
          if (
              self._registration is None
              and self.specifications
              and self.__validated
              and self.__controller_on
          ):
              # Use a copy of component properties
              properties = self._ipopo_instance.context.properties.copy()
              bundle_context = self._ipopo_instance.bundle_context
  
              # Register the service
              self._registration = bundle_context.register_service(
                  self.specifications,
                  self._ipopo_instance.instance,
                  properties,
                  factory=self.__is_factory,
                  prototype=self.__is_prototype,
              )
              self._svc_reference = self._registration.get_reference()
  
              # Notify the component
              self._ipopo_instance.safe_callback(
                  ipopo_constants.IPOPO_CALLBACK_POST_REGISTRATION,
                  self._svc_reference,
              )
docs: Registers the provided service, if possible