Andy Seaborne created JENA-1483:
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             Summary: Allow different promote() modes.
                 Key: JENA-1483
                 URL: https://issues.apache.org/jira/browse/JENA-1483
             Project: Apache Jena
          Issue Type: Improvement
            Reporter: Andy Seaborne


This follows on from JENA-1458.

In the previous work, there is one promote operation, {{promote()}}, that takes 
the transaction type to determine whether to promote with or without "read 
commits" effects.

This ticket introduces {{promote(Promote mode)}} where the mode can be given 
explicitly.

{{promote()}} becomes a default method of the interface that chooses the 
promote mode based on the way the transaction was started.

This ticket also changes {{promote}} to return boolean false, and  leave the 
transaction still valid, if an attempt is made to promote a read-only 
transaction. This is more uniform between the transaction type and any 
intermediate writer blocking promotion in READ_PROMOTE.



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