Query cancel and timeout support
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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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