Re: Nesting Transactions

You can make that increaseNutPurchases(...) method into an anonymous
transaction with the same amount of code or less.

:)



On Tue, Jun 30, 2009 at 10:11 PM, Justin T. Sampson<[email protected]> wrote:
> That's kind of the opposite of Prevayler's design. :)
>
> Prevayler's whole architecture is based on the fact that transactions are
> encapsulated into objects. This allows transactions to be journaled,
> replicated, and executed in a streamlined concurrent pipeline.
>
> Could you say more about why you don't want to write a "composite
> transaction"? There may be other things people have done to address similar
> concerns.
>
> Cheers,
> Justin
>
>
> On Tue, Jun 30, 2009 at 2:40 PM, Ross Rick <[email protected]> wrote:
>>
>> Hi all,
>> I wonder if anyone has tried nesting transactions with prevayler before.
>>
>> To be specific, lets imagine two calls to the same transaction done
>> sequentially.
>>
>> LocalList.add( prevayler.execute ( new GetNutsTransaction( "Walnuts") ;
>>
>> LocalList.add( prevayler.execute ( new GetNutsTransaction ("Pecans") ;
>>
>> What I would like to do is make those two calls within the same
>> transaction without being forced to code a sort of composite transaction.
>> Of course, what I am really getting at is the ability to arbitrarily start a
>> transaction and then have that bundle all of the smaller transactions until
>> I explicitly commit.   As a more realistic example, I would want to do
>> something like this :
>>
>> public void increaseNutPurchases(String[] nutTypes, int pctIncrease) {
>>
>>     Transaction txn = startLongishTransaction();
>>
>>     try {
>>         for (String nutType : nutTypes) {
>>
>>             List growers = prevayler.execute(new GetGrowerQuery(nutType));
>>             for (Grower grower : growers) {
>>
>>                 prevayler.execute(new UpdateBuyQuantityTransaction(grower,
>> pctIncrease));
>>
>>             }
>>         }
>>     }
>>
>>     catch (Exception e) {
>>         txn.rollback();
>>     }
>>     txn.commit():
>>
>> }
>>
>> Has anyone tried this ??   Known issues?   Any red flags pop up for you
>> looking at this?
>> Thx,
>> Rick
>>
>>
>> ------------------------------------------------------------------------------
>>
>> _______________________________________________
>> To unsubscribe go to the end of this page:
>> http://lists.sourceforge.net/lists/listinfo/prevayler-discussion
>> _______________________________________________
>> "Databases in Memoriam" -- http://www.prevayler.org
>>
>
>
> ------------------------------------------------------------------------------
>
> _______________________________________________
> To unsubscribe go to the end of this page:
> http://lists.sourceforge.net/lists/listinfo/prevayler-discussion
> _______________________________________________
> "Databases in Memoriam" -- http://www.prevayler.org
>
>

------------------------------------------------------------------------------
_______________________________________________
To unsubscribe go to the end of this page: http://lists.sourceforge.net/lists/listinfo/prevayler-discussion
_______________________________________________
"Databases in Memoriam" -- http://www.prevayler.org