Re: Nesting Transactions

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
>
>
>
>
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