webapp/backend/misc.py

   1 #!/usr/bin/python
   2
   3 class Singleton(type):
   4         """
   5                 A class for using the singleton pattern
   6         """
   7
   8         def __init__(cls, name, bases, dict):
   9                 super(Singleton, cls).__init__(name, bases, dict)
  10                 cls.instance = None
  11
  12         def __call__(cls, *args, **kw):
  13                 if cls.instance is None:
  14                         cls.instance = super(Singleton, cls).__call__(*args, **kw)
  15
  16                 return cls.instance