[Twisted-Python] waitForDeferred Question

Brian Granger bgranger at scu.edu
Sat Mar 11 02:08:09 EST 2006

On 3/10/06, Cory Dodt <corydodt at twistedmatrix.com> wrote:
> Brian Granger wrote:
> > But, in many cases, the computeSomethingUsingTwisted() doesn't take
> > long at all.  An example of this would be probing the status of the
> > remote server or a trivial computation that a server has relevant data
> > for.  In these cases, the result is available nearly instantly (faster
> > then the user could detect, like 1 ms) and it is silly to have a job
> > interface.  You simply want the result directly.
> Another approach: wait 10ms every time you push out a prompt.  The
> problem is you're trying to generate the prompt in a synchronous manner
> in an asynchronous environment.  10ms is well below the threshhold that
> users will notice.  You'll still want job control for long calculations,
> but you can present it in a more natural way.. if it's not available at
> the first prompt, it's a background job.

I am not super familiar with PyShell/PyCrust, but I think everything
(including the prompt generation) is done asynchronously.  The only
thing that could really block would be long running python code
executed in the users namespace in PyShell.  But, I do like the idea
of having immediate results return directly, but have everything else
become a background job.  But, the question still remains - how do you
convert a Deferred() to a blocking, directly returned result?

> C
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Brian Granger
Santa Clara University
ellisonbg at gmail.com

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