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From "Andy Jefferson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JDO-597) PMF : Add "readOnly" setting for better handling of read-only datastores
Date Fri, 27 Jun 2008 06:07:45 GMT

    [ https://issues.apache.org/jira/browse/JDO-597?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12608666#action_12608666

Andy Jefferson commented on JDO-597:

SVN trunk now has the JDOReadOnlyException, and the setter/getter on the PMF.

One thing to add : the default for this property should probably be false, since default JDO
usage will be to persist data.

> PMF : Add "readOnly" setting for better handling of read-only datastores
> ------------------------------------------------------------------------
>                 Key: JDO-597
>                 URL: https://issues.apache.org/jira/browse/JDO-597
>             Project: JDO
>          Issue Type: New Feature
>          Components: api2, api2-legacy, specification
>            Reporter: Andy Jefferson
>             Fix For: JDO 2 maintenance release 2
>         Attachments: JDOReadOnlyException.patch
> A user has a datastore that is outside their control and they either don't have permission
to write to it, or maybe they have permissions but don't want to write to it. They want a
better way of handling this, preventing updates to the datastore.
> Propose :-
> PMF property (with setter/getter)
> javax.jdo.option.ReadOnly - values true | false
> JDOReadOnlyException extends JDOUserException
> Behaviour :-
> When readOnly is set to true :-
> Any operation resulting in a creation/modification of an object to be sent to the datastore
should throw a JDOReadOnlyException. This may be at commit(), flush(), or alternatively at
makePersistent() when using datastore txns, or query.deletePersistentAll(). That is, no change
should be made to the datastore contents at all.

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