David Jencks wrote:
> On 2002.09.27 16:21:33 -0400 Igor Fedorenko wrote:
>
>>David Jencks wrote:
>>
>>>Hi Igor,
>>>
>>>I'd like to stick with the jboss tm and add the needed functionality.
>>>
>>>Can you outline what you have been thinking of?
>>
>>I want to allow resource manager specific variation of XAResource state
>>change sequence. This way we'll decouple different RMs from each other
>>and developers will be able to concentrate on one RM without concerns to
>>break others. I have very brief idea how this can be implemented, but I
>>believe it is doable and not too complicated.
>
>
> I'd like to see what you have in mind.
I'm thinking about creating xa resource handlers responsible for making
calls on xa resources. TransactionImpl will keep track of all xa
resources involved into the transaction but will delegate "real" xa work
to the appropriate handler. These handlers will implement interface
something like:
interface XAResourceHandler {
void commit(TransactionImpl tx) throws ...;
boolean delistResource(TransactionImpl tx, int flag) throws ...;
boolean enlistResource(TransactionImpl tx) throws ...;
void rollback(TransactionImpl tx) throws ...;
}
We will provide DefaultXAResourceHandler which will work with ideal xa
resource implementations but will allow registration of rm specific
implementations which will support whatever crazy logic in necessary to
work with the rm.
Obviously I do not know all implementation details yet but I am pretty
sure that it will not complicate our code much. Unfortunately I do not
know when I'll be able to implement it.
>
>
>>>Also, is the new xa wrapper in cvs HEAD working well enough to move to
>>
>>3.2?
>>
>>>Should we even move it to 3.0?
>>
>>What do you think about cached javax.jdbc.XAConnection.getConnection()
>>problem I've mentioned few days ago? Can we afford saying "Oracle 8i is
>>not supported in XA mode"?
>
>
> I don't know... saying it isn't supported might be better than all the
> problems people are having.
>
> Do you think it is ok to get a new Connection from the XAConnection
> whenever associateConnection is called? If we can do this, it wouldn't be
> too hard to change. I'm still mystified as to how Oracle can tell how many
> Connection handles we are using and how it can decide to object.
Well, most likely I misinterpreted the behaviour I've observed ;-) I
believe oracle 8i should work fine with TrackConnectionByTx.
--
Igor Fedorenko
Think smart. Think automated. Think Dynamics.
www.thinkdynamics.com
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