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25 lines
697 B
Python
25 lines
697 B
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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"""The singleton metaclass for ensuring only one instance of a class."""
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import abc
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from typing import Any
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class Singleton(abc.ABCMeta, type):
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"""Singleton metaclass for ensuring only one instance of a class"""
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_instances = {}
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def __call__(cls, *args: Any, **kwargs: Any) -> Any:
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"""Call method for the singleton metaclass"""
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if cls not in cls._instances:
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cls._instances[cls] = super(Singleton, cls).__call__(*args, **kwargs)
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return cls._instances[cls]
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class AbstractSingleton(abc.ABC, metaclass=Singleton):
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"""Abstract singleton class for ensuring only one instance of a class"""
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pass
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