mirror of
https://github.com/PaiGramTeam/MibooGram.git
synced 2024-11-30 19:31:41 +00:00
53 lines
1.3 KiB
Python
53 lines
1.3 KiB
Python
|
from multiprocessing import RLock as Lock
|
||
|
|
from typing import ClassVar, Generic, Optional, TYPE_CHECKING, Type, TypeVar
|
||
|
|
|
||
|
|
from typing_extensions import Self
|
||
|
|
|
||
|
|
if TYPE_CHECKING:
|
||
|
|
from multiprocessing.synchronize import RLock as LockType
|
||
|
|
|
||
|
|
__all__ = ["singleton", "Singleton"]
|
||
|
|
|
||
|
|
T = TypeVar("T")
|
||
|
|
|
||
|
|
|
||
|
|
class _Singleton(Generic[T]):
|
||
|
|
lock: ClassVar["LockType"] = Lock()
|
||
|
|
|
||
|
|
__slots__ = "cls", "instance"
|
||
|
|
|
||
|
|
cls: Type[T]
|
||
|
|
instance: Optional[T]
|
||
|
|
|
||
|
|
def __init__(self, cls: Type[T]):
|
||
|
|
self.cls = cls
|
||
|
|
self.instance = None
|
||
|
|
|
||
|
|
def __call__(self, *args, **kwargs) -> T:
|
||
|
|
with self.lock:
|
||
|
|
if self.instance is None or args or kwargs:
|
||
|
|
self.instance = self.cls(*args, **kwargs)
|
||
|
|
return self.instance
|
||
|
|
|
||
|
|
|
||
|
|
def singleton(cls: Optional[Type[T]] = None) -> Type[T]:
|
||
|
|
"""单例装饰器。用于装饰 class , 使之成为单例"""
|
||
|
|
|
||
|
|
def wrap(_cls: Type[T]) -> _Singleton[T]:
|
||
|
|
return _Singleton(_cls)
|
||
|
|
|
||
|
|
return wrap if cls is None else wrap(cls)
|
||
|
|
|
||
|
|
|
||
|
|
class Singleton:
|
||
|
|
"""单例"""
|
||
|
|
|
||
|
|
_lock: ClassVar["LockType"] = Lock()
|
||
|
|
_instance: ClassVar[Optional[Self]] = None
|
||
|
|
|
||
|
|
def __new__(cls: Type[T], *args, **kwargs) -> T:
|
||
|
|
with cls._lock:
|
||
|
|
if cls._instance is None:
|
||
|
|
cls._instance = object.__new__(cls)
|
||
|
|
return cls._instance
|