<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _register_service(self):
 """ Registers the provided service, if possible """

        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,
            )