16 lines
524 B
Python
16 lines
524 B
Python
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#This file is part of Tryton. The COPYRIGHT file at the top level of
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#this repository contains the full copyright notices and license terms.
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class Singleton(type):
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'''
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Metaclass for singleton pattern
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'''
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def __init__(cls, name, bases, dict):
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super(Singleton, cls).__init__(name, bases, dict)
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cls.instance = None
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def __call__(cls, *args, **kwargs):
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if cls.instance is None:
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cls.instance = super(Singleton, cls).__call__(*args, **kwargs)
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return cls.instance
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