24 lines
527 B
Python
24 lines
527 B
Python
import abc
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import threading
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class Singleton(abc.ABCMeta, type):
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"""
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类单例模式
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"""
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_instances: dict = {}
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_lock = threading.Lock()
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def __call__(cls, *args, **kwargs):
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key = (cls, args, frozenset(kwargs.items()))
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with cls._lock:
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if key not in cls._instances:
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cls._instances[key] = super().__call__(*args, **kwargs)
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return cls._instances[key]
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class AbstractSingleton(abc.ABC, metaclass=Singleton):
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"""
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抽像类单例模式
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""" |