On Wed, Nov 26, 2008 at 2:58 PM, Raphael Simon <[EMAIL PROTECTED]> wrote:
>
> One way to do this (which is how I was thinking of implementing it) would be
> to introduce a 'try_sequence' which uses a 'catch' and 'finally' reference
> to subprocesses. This expression would inherit from the 'sequence'
> expression and redefine 'next_child' to replace the next children with the
> 'catch' sub-process if the previously evaluated child returned an error. The
> 'reply' would execute the 'finally' sub-process prior to returning to the
> parent.
>
> <try_sequence catch='catch_process' finally='finally_process'>
> <participant ref='...'/>
> <participant ref='...'/>
> </try_sequence>
> <process-definition name="catch_process">
> ...
> </process-definition>
> <process-definition name="finally_process">
> ...
> </process-definition>
>
> Two comments:
>
> 1. It may also be good to introduce a 'try_concurrence' for completeness (I
> don't have a use case for it right now though)
> 2. Instead of introducing new expressions, the existing 'sequence' and
> 'concurrence' expressions could be modified to take these optional 'catch'
> and 'finally' parameters.
>
> Does this make sense?
Hello, it makes sense. But the thing that I tried to mention in my
previous mail was :
<try_sequence>
<a/>
<sequence>
<b0 />
<b1 />
</sequence>
<c/>
</try_sequence>
The next_child() of the try_sequence is called when transiting from a
to sequence to c but not when transiting from b0 to b1, it has 1 level
of depth only.
That's why I was hinting at the undo/redo mecha which could be
imitated / reused to exit from deep inside a construct.
Cheers,
--
John Mettraux - http://jmettraux.wordpress.com
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