BTM Implementation details
BTM is made of multiple modules which map as close as possible the JTA API.
This page contains descriptions of those components and how they work internally once BTM 1.3 will be released, as versions 1.2 and before do not fully respect this modularization.
Bitronix implementation specifics
The JTA specification defines XID as an interface for which an implementation must be provided by the transaction manager. There are 3 important pieces composing a XID: the format ID, the Global TRansaction ID (GTRID) and the Branch QUALilifier (BQUAL).
XA connection pooling framework