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https://github.com/PaiGramTeam/MibooGram.git
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233e7ab58d
Co-authored-by: luoshuijs <luoshuijs@outlook.com> Co-authored-by: Karako <karakohear@gmail.com> Co-authored-by: xtaodada <xtao@xtaolink.cn>
53 lines
1.3 KiB
Python
53 lines
1.3 KiB
Python
from multiprocessing import RLock as Lock
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from typing import ClassVar, Generic, Optional, TYPE_CHECKING, Type, TypeVar
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from typing_extensions import Self
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if TYPE_CHECKING:
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from multiprocessing.synchronize import RLock as LockType
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__all__ = ["singleton", "Singleton"]
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T = TypeVar("T")
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class _Singleton(Generic[T]):
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lock: ClassVar["LockType"] = Lock()
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__slots__ = "cls", "instance"
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cls: Type[T]
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instance: Optional[T]
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def __init__(self, cls: Type[T]):
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self.cls = cls
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self.instance = None
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def __call__(self, *args, **kwargs) -> T:
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with self.lock:
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if self.instance is None or args or kwargs:
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self.instance = self.cls(*args, **kwargs)
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return self.instance
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def singleton(cls: Optional[Type[T]] = None) -> Type[T]:
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"""单例装饰器。用于装饰 class , 使之成为单例"""
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def wrap(_cls: Type[T]) -> _Singleton[T]:
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return _Singleton(_cls)
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return wrap if cls is None else wrap(cls)
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class Singleton:
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"""单例"""
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_lock: ClassVar["LockType"] = Lock()
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_instance: ClassVar[Optional[Self]] = None
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def __new__(cls: Type[T], *args, **kwargs) -> T:
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with cls._lock:
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if cls._instance is None:
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cls._instance = object.__new__(cls)
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return cls._instance
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