Singleton.py

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#/usr/bin/env python
# -*- coding: euc-jp -*-
 
 
 
import _thread
 
 
class Singleton(object):
  __lockObj = _thread.allocate_lock()
  __instance = None
 
  def __new__(self, *args, **kargs):
    return self.instance(*args, **kargs)
 
 
  def __init__(self, *args, **kargs):
    self.instance(*args, **kargs)
 
 
  def instance(self, *args, **kargs):
    self.__lockObj.acquire()
    try:
      if self.__instance is None:
        self.__instance = object.__new__(self, *args, **kargs)
 
    finally:
      self.__lockObj.release()
 
    return self.__instance
 
  instance = classmethod(instance)