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Posted to dev@jena.apache.org by "Pip Cet (JIRA)" <ji...@apache.org> on 2019/01/04 21:21:00 UTC

[jira] [Created] (JENA-1656) Make DatasetGraphMonitor transaction-aware

Pip Cet created JENA-1656:
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             Summary: Make DatasetGraphMonitor transaction-aware
                 Key: JENA-1656
                 URL: https://issues.apache.org/jira/browse/JENA-1656
             Project: Apache Jena
          Issue Type: Improvement
          Components: ARQ
    Affects Versions: Jena 3.10.0
            Reporter: Pip Cet


In order to implement continuously-updated query result streams, I used a DatasetGraphMonitor to monitor when the relevant part of the dataset graph changed in order to re-run the query. However, there was a race condition because DatasetGraphMonitor informs its monitor of uncommitted changes; the query would be repeated too soon, meaning the changes would be missed.

Adding the commit() method to the DatasetChanges interface and using it seems to avoid this issue.



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