Re: Once again :-) Question on Transaction support

Carlos:

On Sun, 2004-08-08 at 16:52, Carlos Cardenas wrote:
> Hi again,
> 
> Thanks for your previous answers, most helpful :-)
> 
> now, is there any direct support for transactions in keel?

Well, at some levels yes. E.g. for persistence the API supports the
concept of a "transaction" (typically a database-level transaction).

But there is not general-purpose support for something like JTA, as most
other services (other than JDO and Persistence) are not transactional. 

OTOH, I seem to recall something about Avalon/Fortress-level transaction
support - and as Keel is built on top of that.... something to research
:-)

> I don't remember seeing this anywhere in the docos.  Is there a
> transactable interface for components (entity and service components)
> ?
> 
> If not, is there any plans for this?  I think spring do deal with
> transactions, can we piggy back on the concepts they use?

Is the way Spring does Transactions oriented around persistence, or
generic enough to become a lifecycle event in Fortress (for example).

I'm thinking something along the lines of a "TransactionEnabled"
interface (like LogEnabled), that might have the kind of generic
transaction hooks such as "begin()", "commit()", "rollback()".... Just
thinking out loud, though...

I'm all for not re-inventing any wheels :-)


> in any case, would keel transactions be able to participate in a J2EE
> (ejb) transaction ?  I gues it's more like the other way around, since
> using ejb's in keel is just one of the options.

Certainly EJB's are an option, and EJBs called from Keel can participate
in a transaction.

HTH!

Mike

> 
> Please meknow.
> 
> Thanks, Carlos
>