OOP Design

Stack Risk Checks as Decorators

Difficulty

Asked at Citadel Securities

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Language: Python 3.12build

from collections.abc import Callable
from typing import Protocol


class Handler(Protocol):
    """..."""

    def handle(self, order: dict[str, int]) -> tuple[bool, str]:
        ...


class Gateway:
    """..."""

    def __init__(self) -> None:
        self.sent = []

    def handle(self, order: dict[str, int]) -> tuple[bool, str]:
        # ...
        pass


class MaxSize:
    """..."""

    def __init__(self, inner: Handler, limit: int) -> None:
        # ...
        pass

    def handle(self, order: dict[str, int]) -> tuple[bool, str]:
        # ...
        pass


class PriceBand:
    """..."""

    def __init__(self, inner: Handler, low: int, high: int) -> None:
        # ...
        pass

    def handle(self, order: dict[str, int]) -> tuple[bool, str]:
        # ...
        pass


class RateLimit:
    """..."""

    def __init__(self, inner: Handler, allowance: int) -> None:
        # ...
        pass

    def handle(self, order: dict[str, int]) -> tuple[bool, str]:
        # ...
        pass


class NotionalCap:
    """..."""

    def __init__(self, inner: Handler, cap: int) -> None:
        # ...
        pass

    def handle(self, order: dict[str, int]) -> tuple[bool, str]:
        # ...
        pass


def build(gateway: Gateway, checks: list[Callable[[Handler], Handler]]) -> Handler:
    """..."""
    # ...
    pass

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Stack Risk Checks as Decorators

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