[CentralOH] Singleton Revised

John Santiago jdsantiagojr at gmail.com
Mon Mar 18 05:05:17 CET 2013

Sorry sent old one, here is new singleton. I am seeing a lot of examples.
Just would liek some critique on this one

import threading
from cherrypy._cpwsgi_server import CPWSGIServer

class Singleton(object):
    __instance = None
    __lockInstance = threading.RLock()

    def __new__(cls):
        raise TypeError("Error: Singletons may only be instantiated through

    def __init__(self):
        print 'hi'

    def getInstance(cls, *args, **kwargs):
        if cls.__instance is None:
                cls.__instance = object.__new__(cls)
                cls.__instance.__init__(*args, **kwargs)

        return cls.__instance

if __name__ == '__main__':
    s1 = Singleton.getInstance()
    s2 = Singleton.getInstance()
    s3 = Singleton.getInstance()
    s4 = Singleton.getInstance()
    s5 = Singleton()

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