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From "Andy Jefferson (JIRA)" <j...@apache.org>
Subject [jira] Updated: (JDO-623) Query cancel and timeout support
Date Sat, 07 Feb 2009 07:50:59 GMT

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

Andy Jefferson updated JDO-623:
-------------------------------

    Attachment: query_timeout.patch

Patch for Query API changes, JDOQueryTimeoutException, JDOQueryInterruptedException, and associated
changes for PMF property. 

I've made the timeout value as milliseconds so we have sufficient granularity to cater for
all eventualities. Anyone prefer seconds?

> 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: 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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