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From "Stephen Allen (JIRA)" <>
Subject [jira] [Updated] (JENA-120) Query objects with aggregators cannot be reused
Date Wed, 21 Sep 2011 16:05:14 GMT


Stephen Allen updated JENA-120:

    Attachment: JENA-120-r1173738.patch

> Query objects with aggregators cannot be reused
> -----------------------------------------------
>                 Key: JENA-120
>                 URL:
>             Project: Jena
>          Issue Type: Bug
>          Components: ARQ
>            Reporter: Stephen Allen
>            Assignee: Andy Seaborne
>            Priority: Minor
>         Attachments: JENA-120-r1173178.patch, JENA-120-r1173729.patch, JENA-120-r1173738.patch
> Query objects that contain aggregators (Group By) cannot be reused by different threads
because the internal state is mutable.  Even reusing a query object in the same thread has
problems, because it creates a new Aggregator object each time you execute the query.  Users
may want to reuse Query objects to save having to reparse the query string.
> I believe the solution is to copy the aggregators when compiling the query.  I've attached
a patch that does that in the AlgebraGenerator.compileModifiers() method.
> See the thread at [1] for more discussion.
> [1]

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