Code design problem
Marshall T. Vandegrift
llasram at gmail.com
Wed Aug 29 15:03:54 CEST 2007
Marco Nawijn <nawijn at gmail.com> writes:
> The problem I face is that the implementation of the application class
> is completely different for the local and remote case. The local case
> is a straightforward implemenation using the subprocess module, the
> remote case is a CORBA implementation. Somehow I would like to switch
> from implementation class at runtime depending on whether or not the
> host parameter is specified or not.
> The Application, local implementation and remote implementation all
> have the same interface, so a possibility might be something like the
> To me forwarding each call in the Application class looks a little bit
> redundant and I would like to get rid of it. Does anyone have any
> comments or suggestions? Can metaclass programming come to rescue?
It sounds like you could probably get away with just a factory function:
def Application(program, host=None):
if host is None:
return RemoteApplication(program, host)
Then just implement the same interface and/or derive from a common base
class for LocalApplication and RemoteApplication.
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