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From "Michael Bouschen (JIRA)" <j...@apache.org>
Subject [jira] Updated: (JDO-623) Query cancel and timeout support
Date Sun, 12 Jul 2009 21:47:14 GMT

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

Michael Bouschen updated JDO-623:
---------------------------------

    Attachment: JDO-623-tck2-mbo.patch

Attached you find a patch for review adding two new tck2 test classes:
- QueryCancel 
- QueryTimeout

I haven't added the two new test classes to the tck conf files. The current datanuclues JDOQL
implementation does not support query canceling and the alternate implementation of JDOQL
that will eventually replace the current one is not yet finished.

In order to include the test classes add the following lines to the property jdo.tck.classes
in query.conf:
org.apache.jdo.tck.query.api.QueryCancel \
org.apache.jdo.tck.query.api.QueryTimeout

> 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: Michael Bouschen
>             Fix For: JDO 2 maintenance release 3
>
>         Attachments: JDO-623-mbo.patch, JDO-623-tck2-mbo.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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