RE: [wsbpel] RE: Issue - 207 - Revised description

["Satish Thatte" <satisht@microsoft.com>]

The use of <compensate/> without a scope name, which Yaron refers to, perhaps should be named something different because it is different in kind from the usual scope compensation activity.  The latter is legal only in enclosing scopes.

________________________________

From: Yaron Y. Goland [mailto:ygoland@bea.com]
Sent: Thu 5/19/2005 10:54 AM
To: Furniss, Peter
Cc: wsbpel@lists.oasis-open.org
Subject: Re: [wsbpel] RE: Issue - 207 - Revised description



I'm not sure what you mean. Today it is legal and appropriate to use the
compensate activity from inside of a fault handler. I've reviewed this
mail twice and I'm still not clear as to your concern.

Could you please give a short example of something that you think is
illegal in the spec today that this issue would now make legal that is
causing you concern?

        Thanks,

                Yaron


Furniss, Peter wrote:
> Looking at the substance of this proposed issue, it seems to be proposing a
> rather different model from the existing one.  Surely the existing model is
> that, until a scope exits, anything that it has done but that will need
> unwinding in the event of fault has to be coped with by the fault handler; after
> the scope has exited, it is the responsibility of that scope's compensation handler.
> 
> There will be cases where some more sophisticated pattern might seem more
> convenient - if scope B does operation b1, then b2, then b3, all directly in B,
> then the fault handler may need to know if b2 has been done to work out if it
> must undo it. The solution of course is to put the operations each in its own
> scope, in which case B can leave it to the default fault handler to undo things
> backwards, but only of the things that have finished.
> 
> The issue does raise some questions of what happens if a compensation handler
> itself contains a scope.
> 
>
> Peter
>
> -----------------------------------
> Chief Scientist
> Choreology Ltd
> 68 Lombard Street, London EC3V 9LJ, UK
> web: www.choreology.com
> mobile:  +44 7951 536168
>


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