[jira] Updated: (OPENJPA-310) Rework ManagedRuntime to make better use of TransactionSynchronizationRegistry

["Patrick Linskey (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/OPENJPA-310?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Patrick Linskey updated OPENJPA-310:
------------------------------------

    Fix Version/s:     (was: 1.1.0)
                   1.2.0

> Rework ManagedRuntime to make better use of TransactionSynchronizationRegistry
> ------------------------------------------------------------------------------
>
>                 Key: OPENJPA-310
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-310
>             Project: OpenJPA
>          Issue Type: Improvement
>          Components: kernel
>    Affects Versions: 1.0.0
>            Reporter: Craig Russell
>            Priority: Minor
>             Fix For: 1.2.0
>
>         Attachments: OPENJPA-310-patch.zip, OPENJPA-310.patch
>
>
> This is the continuation of the TransactionSynchronizationRegistry issue OPENJPA-295 that is now resolved.
> Looking at how to use the TSR map of object->object instead of the _transactional, we would need to make a change to the AbstractBrokerFactory method BrokerImpl findTransactionalBroker(String user, String pass). The change would delegate to the ManagedRuntime which might have a better way to look up the Broker in the context of the current transaction.
> The _transactional map is a map of TransactionKey to Broker. This is needed for a completely different purpose (keeping track of whether there are any Brokers with open transactions). 
> The issue is separation of concerns. Currently the ManagedRuntime doesn't really know anything about Brokers or transaction maps. To implement the findTransactionalBroker entirely in ManagedRuntime would introduce a lot of broker-aware code. We could simply have ManagedRuntime know about a Map of Transaction to Object, and do the rest of the processing in AbstractBrokerFactory. This would separate functionality but not completely.
> With this separation, the ManagedRuntime would have a new method Object getByTransactionKey(Object brokerFactory, Map transactional) that returns the entry associated with the current transaction (which it knows how to get) in the Map parameter (Abstract implementation) or the entry associated with the TSR Map using the brokerFactory as the key. This is not completely abstract but pretty close.
> But if we do all that, we should probably look at delegating most of the syncWithManagedTransaction to the ManagedRuntime as well...

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