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from __future__ import annotations
from abc import ABC, abstractmethod
from types import TracebackType
from typing import Optional, Type
class DisposableBase(ABC):
"""Disposable abstract base class."""
__slots__ = ()
@abstractmethod
def dispose(self) -> None:
"""Dispose the object: stop whatever we're doing and release all of the
resources we might be using.
"""
raise NotImplementedError
def __enter__(self) -> DisposableBase:
"""Context management protocol."""
return self
def __exit__(
self,
exctype: Optional[Type[BaseException]],
excinst: Optional[BaseException],
exctb: Optional[TracebackType],
) -> None:
"""Context management protocol."""
self.dispose()
__all__ = ["DisposableBase"]
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