[gme-users] Nested transactions

[Peter Volgyesi]

Hi James,

I wonder what do you gain by having a "root transaction". In your
interpreter you can have fine grained transaction logic (I guess we
call this "custom transactions" in the interpreter wizard and/or in
the componentconfig.h file). So, your interpreter can commit changes
any time to trigger the add-ons (and GUI), but why do you need an all
encompassing transaction in this case ?

--
peter



On Thu, Aug 5, 2010 at 7:52 AM, James H. Hill <hillj at cs.iupui.edu> wrote:
> Hi Peter,
>
> Ah, I see. Thanks for the quick reply.
>
> Are there any plans to make sure a feature available in interpreters? I can
> see a case were you may have an interpreter that:
>
> . starts a root transactions
> . makes incremental updates to the model in nested transactions
> . commits its current modifications to force the *add-on* to execute
> . commits root transactions once everything is complete
>
> I would think that nested transactions would make this use cause much easier
> to implement without *duplicating* a LOT of code. Or, do you know a
> workaround for *emulating* nested transactions in interpreters to prevent
> duplicating a LOT of code or causing tight coupling of code?!
>
> Thanks,
>
> James
>
> On 8/5/10 8:42 AM, Peter Volgyesi wrote:
>>
>> Nested transactions are used only inside MGA (to implement add-on
>> notifications in which add-on can further modify the models).
>> --
>> peter
>>
>>
>>
>> On Wed, Aug 4, 2010 at 5:23 PM, James H. Hill<hillj at cs.iupui.edu>  wrote:
>>>
>>> Hi,
>>>
>>> Does anyone know if GME supports nested transactions in it's
>>> interpreters, and how to do so?!
>>>
>>> I see that there is an enumeration value TRANSACTION_NON_NESTED, but
>>> there is no TRANSACTION_NESTED value. I only see TRANSACTION_GENERAL,
>>> which seems to not support nested transactions.
>>>
>>> Any help would be greatly appreciated.
>>>
>>> Thanks,
>>>
>>> James
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>>> gme-users at list.isis.vanderbilt.edu
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>>>
>