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From "Michael Bouschen (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (JDO-623) Query cancel and timeout support
Date Mon, 11 Jan 2010 21:20:54 GMT

     [ https://issues.apache.org/jira/browse/JDO-623?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael Bouschen reassigned JDO-623:
------------------------------------

    Assignee: Andy Jefferson  (was: Michael Bouschen)

Checked in the patch (see revision 898066).

Assigning the issue to Andy, because the testcase fails with the current datanucleus version.
I think this is because method PMF.supportedOptions does not include "javax.jdo.option.DatastoreTimeout"
in the returned collection. So the testcase assumes datastore timeout is not supported and
thus expects the setter methods setDatastoreRead/WriteTimeout should result in a JDOUnsupportedOptionException.

> Query cancel and timeout support
> --------------------------------
>
>                 Key: JDO-623
>                 URL: https://issues.apache.org/jira/browse/JDO-623
>             Project: JDO
>          Issue Type: New Feature
>          Components: api2, tck2
>            Reporter: Andy Jefferson
>            Assignee: Andy Jefferson
>             Fix For: JDO 2 maintenance release 3
>
>         Attachments: JDO-623-mbo.patch, JDO-623-tck2-mbo.patch, JDO-623-testcase.patch,
jdo623.patch, pmf_option.patch, query.patch, query_timeout.patch
>
>
> JDO doesn't have a mechanism to stop queries from overrunning. JPA2 now allows 
> a persistence property to allow timing them out, and most JDO implementations 
> have allowed this as an extension since JDO1. It would make sense for JDO 
> (2.3) to have the same or a variation. I propose having the following
> Simple PMF property "javax.jdo.option.queryTimeout" to specify the number of millisecs
(or secs) before any query is timed out. Throw a QueryTimeoutException (extends JDOException)
when the timeout happens.
> Add methods Query.setTimeout(int), Query.getTimeout() to allow setting/retrieving the
timeout interval on a per-query basis.
> Add method Query.cancel() to cancel any running query. If an implementation doesn't support
cancelling of queries then it should throw a JDOUnsupportedOptionException. Any query execute()
that is cancelled will throw a QueryInterruptedException (extends JDOUserException).

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