[jbossts-issues] [JBoss JIRA] (JBTM-1284) Implement concurrent nested transactions

Implement concurrent nested transactions ---------------------------------------- Key: JBTM-1284 URL: https://issues.jboss.org/browse/JBTM-1284 Project: JBoss Transaction Manager Issue Type: Feature Request Security Level: Public(Everyone can see) Components: Transaction Core Reporter: Tom Jenkinson Needs sanity checking We can collaborate on the work via linked GitHub branch The problem out of the box is when you AtomicAction "begin" - you will link to the ThreadActionData, as you can see in the test I can circumvent that via a different API call start passing in the parent directly. You can see there is precedent to manipulate ThreadActionData: ArjunaCore/arjuna/classes/com/arjuna/ats/arjuna/coordinator/AsyncPrepare.java (doing the prepare in multiple threads) I think this is feasible, it may need some thread safety via synchronization in the AtomicAction. Nested Transactions in core look to be able to support concurrent access except: 1. Threading may not work, will need to check and fix 2. ThreadActionData imposes a stack You can see in my test (linked in the GitHub branch) I am circumventing the stack. we already support nested transactions, it should just be not associating them with a thread and making sure they are thread safe when they talk to their parents