[Twisted-Python] Writing a wrapper from asynchronous to synchronous

Moof moof at metamoof.net
Mon Feb 27 12:41:27 EST 2006

On 2/24/06, Uwe C. Schroeder <uwe at oss4u.com> wrote:

> In the end it's not a flaw in the design. The software package with close to
> 1.5 million lines of code runs just fine and did so for many years.
> The problem is that customers hire some homegrown MS Access programmers for
> whom anything remotely like network programming is a black box  and expect
> them to be able to write a module for my system. It's pretty hard to explain
> deferred's to someone who thinks a socket is the power outlet where he plugs
> his vacuum in and a port is the thing where the ships go to. Guess who gets
> the blame when their employees can't handle it. Thus the idea to make that
> API a bit less "deferred".
> Yeah - I should tell them "hire decent programmers who have a clue"...
> Well, was worth a try - someone might have come up with something...

I came across this problem recently. I ended up using XML-RPC.NET for
the VB side, and twsited's own XML-RPC server for my side. It took me
about a week to realise that this was how to resolve my problem,
rather than working out (in my case) how to make PB be COM-Compliant.
It had the advantage that I just passed an interface file alogn to my
VB programmer who could plug it into hsi system, and he got all his
fancy syntax checkign and pop up values and all the rest.

I did consider SOAP, but WSDL gave me a headache, and I will
apparently have to cope with a VB6 project hooking up to my code in
the near future, for which there is a COM-based XML-RPC library

If it is something they're goign to be "hanging" on for a significant
amount of time, you can, at the very least, offer them a UUID and a
method that they can poll to see if the deferred has fired.


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