[Stackless] Coding Example Re: The case for Twisted

[Andrew Francis]

Hi Folks:

What I believe a good Twisted/Stackless integration
brings to the table is a simple solution to "stack
ripping." This is what I will argue when I present my
experiences with Stackless and Twisted in the
construction of WS-BPEL processors at the September
Ottawa Python User's Group meeting. 

Here is a coding example based on a test driver I
wrote a few months ago (see June 30th post - the
stackless web site seems to be down). I apologize for
the driver being bulky but I was using it to hunt down
a bug and to prototype ideas. 

In this example, I can invoke the Twisted getPage()
method but hide the details of deferreds. 

a code snippet:

 def execute(self):
        try:
            
            """
            the processor's underlying machinery hides
all the
            Twisted deferred information
            
            actual Twisted call client.getPage() that
returns a deferred
            """
            result =
self.processor.getPage('http://www.google.com')
            
            #print the message
            print result
            
        except TwistedException:
            log.msg("A Twisted Exception was thrown")
            log.msg(sys.exc_info())
            
        except:
            log.msg(sys.exc_info()) 
        return
    
(I can also show how calls can be made from a request
handler....)

I believe this provides a much nicer experience for
Stackless developers interested in writing network
applications (with Twisted). 

Although I don't necessarily need it, I don't see why
this approach could not be generalised to cover the
enter Twisted framework.

I would appreciate comments.

Cheers,
Andrew



       
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