import abc
from typing import TYPE_CHECKING, Generic, TypeVar

RequestT = TypeVar("RequestT")
ResponseT = TypeVar("ResponseT")


class Handler(Generic[RequestT, ResponseT], abc.ABC):
    if not TYPE_CHECKING:

        @abc.abstractmethod
        async def handle(self, request: RequestT) -> ResponseT:
            pass

        async def __call__(self, request: RequestT) -> ResponseT:
            return await self.handle(request)