Not sure what you mean. That reference is purely about registering a
subordinate synchronization with the original transaction coordinator.
JBossTS does this already because it's an optional part of the OTS
specification. You create and enlist the sub-synchronization with the
root transaction when the context is imported and then when any local
synchronizations are added, they register with the sub-synchronization.
I mean if a JavaEE provider uses OTS to implement JTA
you cannot map the above method directly onto OTS because the
co-ordinator will raise TRANSACTION_ROLLBACK
So remembering that the JTA is badly written (1.0.1 and 1.1), the
intention in the registerInterposedSynchronization is that the
transaction is active ("Other than the transaction context, no component
J2EE context is active during either of the callbacks.") - has not been
marked as rollback-only and is not terminating. Unfortunately there's no
guarantee (hence the reference to the fact the spec is still badly
written). This doesn't prevent it being mapped onto OTS at all: it just
means that we have to throw a javax.transaction.SystemException that is
vendor specific. The downside of having to invent our own exception is
that it affects portability, but more importantly it ensures that the
right information is conveyed to the application. What should really
happen is that the spec. gets fixed!
Actually, OTS has slightly weaker language:
"TRANSACTION_ROLLEDBACK **may be** raised if the
transaction has been marked rollback only."
Yes, and unfortunately we didn't use RFC2119 to define terms like MAY
and SHOULD, so it's even more lax than usual. However, all
implementations I'm aware of would throw TRANSACTION_ROLLEDBACK (at
least by default).
Mark.
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