[Twisted-Python] A pseudo-deferred class that can be canceled

Glyph Lefkowitz glyph at twistedmatrix.com
Wed Jan 6 22:35:10 EST 2010

On Jan 6, 2010, at 9:46 AM, ssteinerX at gmail.com wrote:

> As far as I know, in my limited spelunking into Twisted's guts, Deferred's pretty much only know about themselves and their callbacks so I'm not sure whether there's a "ringmaster" that knows any more than that that could make sure that all things are cleaned up properly.

Indeed not.  And I don't think there could be; in your ABORT handler description, you are describing a system where pretty much all the constraints are known, and all the code is being integrated into a single unit, together with hardware.  Twisted is supposed to be general-purpose enough that a "ringmaster" packaged with Twisted could not know about every possible different thing that might need to be cancelled and could not account for them...

(Unless of course you're talking about having a plugin API where things could register interest in cancellation, and that's pretty much what Terry and I seem to be converging on in the other fork of this thread.)

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