[GitHub] [jena] afs commented on pull request #1967: Capabilities and locks

["afs (via GitHub)" <gi...@apache.org>]

afs commented on PR #1967:
URL: https://github.com/apache/jena/pull/1967#issuecomment-1646519123

   I was thinking that an MRSW transaction would work as a migration path but it isn't as straight forward as that.
   
   The problem is that graphs have their own API to transactions which does have a distinction of "read" and "write" that can be mapper to "read lock" and "write lock".  Lock promotion isn't supported by Jena's `ReentrantReadWriteLock`.
   
   `SimpleTransactionHandler` does not support transactions. 
   
   For now, it is better to leave `Model.getLock` alone, just revise its javadoc.
   
   I've just come across [StampedLock](https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/locks/StampedLock.html) introduced in Java8 which might help.
   


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