Re: NHibernateIntegration & latest N

(Moving thread to NH-dev)

 

Oren - 

 

I realised there are already a number of open issues on this topic (NH-545,
NH-754, NH-861) so rather than create a new one I've attached a
TestFixture.cs to NH-754 (http://jira.nhibernate.org/browse/NH-754)

 

The test explore interactions between System.Transactions.TransactionScope &
NH2.0. (It could possibly be patched in to the actual solution with some
modifications...)

 

As at NH2.0 Alpha 1 - two scenarios cause unexpected failure: 

 

 - Close a NH session explicitly within a TransactionScope results in
System.ObjectDisposedException : Session is closed! 

(Possibly OK. Closing a session within the transaction doesn't really make
sense - but a better exception might help. Alternatively, closing the
session with an active TransactionScope could just be a null-operation. Ie.
Not fail, but not really do anything either - just deferring the actual
close/dispose to when the tx commits.)

 

 - With the default FlushMode.Auto setting on the session, when you
explicitly flush a second NH session nested within the same TransactionScope
you get a System.Transactions.TransactionInDoubtException : The transaction
is in doubt

(This is unexpected / undesirable. My guess is that it shouldn't matter if I
flush one or many times; on one or many sessions  - the TransactionScope is
still going to define the actual tx boundary. That said, if there is strict
pattern of usage here then better exceptions might help)

 

HTH,

 

Andrew

 

 

From: [email protected]
[mailto:[email protected]] On Behalf Of Ayende Rahien
Sent: Saturday, 14 June 2008 10:39 AM
To: [email protected]
Subject: Re: NHibernateIntegration & latest N

 

Yes, I think we need to have this. I am pretty sure that it is the NH code
that is wrong (I probably wrote it, so it is already suspect).
If you can create a test case that repro this I would be very grateful

On Sat, Jun 14, 2008 at 12:55 AM, Andrew Burgher <[email protected]>
wrote:

Oren - 

 

I can't really suggest what NH2.0 should be doing here.... but with your
comment as additional evidence I believe this may be an issue with the NH
2.0 handing for System.Transactions. Would you like me to raise an issue on
the NHibernate JIRA?

 

My team recently moved to a build from the current NH2.0 trunk and
encountered the same issue. Without too much digging into the NHFacility or
NH code base we were able to find a workaround (basically by taking
responsibility for the session flush ourselves - and only doing it once
within a given System.Transactions.TransactionsScope.) Simple transaction
scenarios looked fine (against a SQL 2K5 database)- but once we enlisted a
second resource (an MSMQ queue) then it broke. From memory, the error we saw
was : 'Transaction in doubt'

 

Regards,

Andrew

 

 

From: [email protected]
[mailto:[email protected]] On Behalf Of Ayende Rahien
Sent: Friday, 13 June 2008 10:57 PM
To: [email protected]
Subject: NHibernateIntegration & latest NH

 

NH now supports integration with System.Transactions, and it has broken the
NHibernateIntegration tests that deals with the distributed transactions.
Specifically, it looks like NH is calling enlistment.Done() when it is
inappropriate, when we commit a distributed transaction on method exit, and
this is not allowed.
I know very little about 2PC, so I am not sure what is supposed to happen
here.
Ideas?

 

 



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