[Twisted-Python] getProcessOutput ok to use in a DeferredList?
stuart.hungerford at anu.edu.au
Mon May 26 21:42:49 EDT 2003
>I'm going to guess what your problem might be, based on a problem I once
>If you have multiple Deferreds, some "depend" on others, DeferredList's
>default behaviour isn't what you want. By "depend" I mean if Deferred A
>fails (and so fires its errback, not callback), then Deferred B will never
>be called, i.e. B depends on A. (This is not official terminology! :).
>In that case, you probably want to use the fireOnOneErrback flag of
>DeferredList. This changes the behaviour of DeferredList so that it will
>fire its callbacks as soon as either:
> - All its Deferreds have fired their callbacks, or
> - any of its Deferreds have fired an errback.
Aha! A brilliant piece of remote empathetic debugging ;-) The lack of
an errback was masking an error from the Deferreds. Many thanks.
:: Stuart Hungerford (stuart.hungerford at anu.edu.au)
:: ANU Internet Futures Group
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