On Thu, Dec 4, 2008 at 5:59 PM, John Mettraux <[EMAIL PROTECTED]> wrote:
>
> But this is no "explicit cancel".
>
> Each expression is meant to have the methods apply/reply and cancel.
> If you cancel a process instance, active expressions will each receive
> the cancel message. ParticipantExpression instances will emit an
> OpenWFE::CancelItem instance to the participant to which they sent a
> workitem (and are waiting for it back)... That would mean that all
> participants in your flow are able to cancel/decommission the whole
> set of things required for their process instance... Sounds painful
> (well in Ruby it's not that hard).


Just a quick link to "undo" (and "redo"), they're useful sometimes
(implicit case though) :

http://openwferu.rubyforge.org/expressions.html#exp_undo


-- 
John Mettraux   -   http://jmettraux.wordpress.com

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