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-""" Implements a singleton mixin class """
-
-# The following code was written by Gary Robinson
-# (grobinson@transpose.com) and placed in the public domain. His
-# copyright notice is as follows:
-
-# By Gary Robinson, grobinson@transpose.com. No rights reserved --
-# placed in the public domain -- which is only reasonable considering
-# how much it owes to other people's version which are in the
-# public domain. The idea of using a metaclass came from
-# a comment on Gary's blog (see
-# http://www.garyrobinson.net/2004/03/python_singleto.html#comments).
-# Other improvements came from comments and email from other
-# people who saw it online. (See the blog post and comments
-# for further credits.)
-
-# Not guaranteed to be fit for any particular purpose. Use at your
-# own risk.
-
-
-class SingletonException(Exception):
- pass
-
-class MetaSingleton(type):
- def __new__(metaclass, strName, tupBases, dict):
- if dict.has_key('__new__'):
- raise SingletonException, 'Can not override __new__ in a Singleton'
- return super(MetaSingleton,metaclass).__new__(metaclass, strName, tupBases, dict)
-
- def __call__(cls, *lstArgs, **dictArgs):
- raise SingletonException, 'Singletons may only be instantiated through getInstance()'
-
-class Singleton(object):
- __metaclass__ = MetaSingleton
-
- def getInstance(cls, *lstArgs):
- """
- Call this to instantiate an instance or retrieve the existing instance.
- If the singleton requires args to be instantiated, include them the first
- time you call getInstance.
- """
- if cls._isInstantiated():
- if len(lstArgs) != 0:
- raise SingletonException, 'If no supplied args, singleton must already be instantiated, or __init__ must require no args'
- else:
- if cls._getConstructionArgCountNotCountingSelf() > 0 and len(lstArgs) <= 0:
- raise SingletonException, 'If the singleton requires __init__ args, supply them on first instantiation'
- instance = cls.__new__(cls)
- instance.__init__(*lstArgs)
- cls.cInstance = instance
- return cls.cInstance
- getInstance = classmethod(getInstance)
-
- def _isInstantiated(cls):
- return hasattr(cls, 'cInstance')
- _isInstantiated = classmethod(_isInstantiated)
-
- def _getConstructionArgCountNotCountingSelf(cls):
- return cls.__init__.im_func.func_code.co_argcount - 1
- _getConstructionArgCountNotCountingSelf = classmethod(_getConstructionArgCountNotCountingSelf)