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fix 单例加锁，防止init方法时间过长导致多次init

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thsrite 2024-04-13 17:33:08 +08:00
parent 6a8a946ec8
commit fc65cc3619
1 changed files with 6 additions and 3 deletions
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9
app/utils/singleton.py
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@ -1,4 +1,5 @@
import abc import abc
import threading
class Singleton(abc.ABCMeta, type): class Singleton(abc.ABCMeta, type):
@ -7,12 +8,14 @@ class Singleton(abc.ABCMeta, type):
""" """
_instances: dict = {} _instances: dict = {}
_lock = threading.Lock()
def __call__(cls, *args, **kwargs): def __call__(cls, *args, **kwargs):
key = (cls, args, frozenset(kwargs.items())) key = (cls, args, frozenset(kwargs.items()))
if key not in cls._instances: with cls._lock:
cls._instances[key] = super().__call__(*args, **kwargs) if key not in cls._instances:
return cls._instances[key] cls._instances[key] = super().__call__(*args, **kwargs)
return cls._instances[key]
class AbstractSingleton(abc.ABC, metaclass=Singleton): class AbstractSingleton(abc.ABC, metaclass=Singleton):