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From "Craig Russell (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JDO-597) PMF : Add "readOnly" setting for better handling of read-only datastores
Date Thu, 26 Jun 2008 20:35:45 GMT

    [ https://issues.apache.org/jira/browse/JDO-597?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12608573#action_12608573

Craig Russell commented on JDO-597:

Good so far. A patch for PMF.java is next?

We can start with PMF and later add a property to Transaction and/or PM if we want/need to.

> 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, 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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