[Twisted-Python] Synchronous Wrapper for Deferreds

James Y Knight foom at fuhm.net
Sat Mar 19 03:15:58 EST 2005

On Mar 19, 2005, at 12:13 AM, Ken Kinder wrote:
> A day or two ago, I inquired on IRC about making calls from an 
> existing synchronous script. The script is not related to any Twisted 
> activity, so minimal intervention was sort of a goal. Obviously this 
> doesn't work on non-transient objects such as Perspective Broker ones, 
> but here's what I came up with... (See attached) Obviously there is 
> some cleaning up to do, but it demonstrates the idea.
> I have three questions: (1) I know this isn't the ideal way to use 
> Twisted, but is there anything inherently problematic about my 
> solution for one-off calls to Twisted. (2) I understand there are 
> problems with running the same reactor twice. What are those problems 
> and is there a recommended work around? (3) Are there any ideas on 
> making a synchronous version of a Perspective Broker client to 
> integrate into existing synchronous applications more easily?

What happened to the idea of starting up a completely normal twisted 
event loop in a different thread and communicating via callFromThread 
and queue objects? That seemed like a relatively elegant way to do it, 
to me, as then you can have many different threads doing synchronousish 
stuff at the same time all using the same twisted event loop.


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