singleton in python ?
Marcel L.K. Opsteegh
mlk_opsteegh at yahoo.com
Fri May 10 09:24:25 EDT 2002
"fritz steindl \(-:fs\)" <fs at floSoft.net> wrote in message news:<1020669846.963494 at newsmaster-04.atnet.at>...
> hi,
>
> what is the best way to implement a singleton in python ???
>
> ( class that allows only _one_ instantiation - like java singletons)
>
> i miss static variables and functions in python (or i don't see them :-)
>
> <thx>
>
> fritz
> (-:fs)
I implement a sigleton normally as following:
class DatabaseManager:
# Singleton (recycle connections)
theConnectionPool = None
class __ConnectionPool:
def __init__(self):
...
def getCursor(self, aRecycleFlag = CURSOR_RECYCLE):
...
def __init__(self):
if DatabaseManager.theConnectionPool == None:
DatabaseManager.theConnectionPool = DatabaseManager.__ConnectionPool()
else:
pass
def __getattr__(self, aName):
return getattr(self.theConnectionPool, aName)
Regards,
Marcel.
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