[jira] [Assigned] (JENA-1223) Provide transaction promotion

["Andy Seaborne (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/JENA-1223?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andy Seaborne reassigned JENA-1223:
-----------------------------------

    Assignee: Andy Seaborne

> Provide transaction promotion
> -----------------------------
>
>                 Key: JENA-1223
>                 URL: https://issues.apache.org/jira/browse/JENA-1223
>             Project: Apache Jena
>          Issue Type: Improvement
>          Components: TDB
>    Affects Versions: Jena 3.1.0
>            Reporter: Andy Seaborne
>            Assignee: Andy Seaborne
>
> This JIRA is to add the ability for a read transaction to promote to a write transaction.
> API changes are necessary to expose this feature properly and uniformly.
> PR #161 provides the machinery for TDB. To avoid general API changes outside TDB, this happens automatically in {{DatasetGraphTransaction.getW()}} if enabled (by default it isn't, the PR makes no change to behaviour of TDB by default).  It needs to be enabled with {{DatasetGraphTransaction.promotion = true}}. PR#161 does contain internal changes (e.g. {{DatasetGraphWrapper}}) outside TDB.
> This leads towards a general {{begin()}} for transactions. 
> This JIRA is cover discussion on the API and record changes to the subsystems.



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