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From "Andy Jefferson (JIRA)" <j...@apache.org>
Subject [jira] Created: (JDO-623) Query cancel and timeout support
Date Fri, 06 Feb 2009 19:38:59 GMT
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

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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