from typing import Type


class BaseClient:
    _data_type = None

    @property
    def is_closed(self):
        return False


class BaseClientFactory:
    def _get_client(self, client_cls: Type[BaseClient]) -> BaseClient:
        client_prop_name = f"_{client_cls.__name__.lower()}"
        instance = getattr(self, client_prop_name, None)
        if not instance or instance.is_closed:
            instance = client_cls()
            setattr(self, client_prop_name, instance)
        return instance