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From "Matthew T. Adams (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JDO-522) Draft proposal for CopyOnAttach property
Date Fri, 14 Sep 2007 15:09:32 GMT

    [ https://issues.apache.org/jira/browse/JDO-522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12527527
] 

Matthew T. Adams commented on JDO-522:
--------------------------------------

Chris, very good start.

Minor issue:  I don't think that the parenthetic statement "multiple calls to makePersistent
with the same pc against the same pm will result in a JDOUserException" is correct.  With
CopyOnAttach set to false, if I pass a detached-dirty instance to a new pm's makePersistent
method, I will get the same instance back, only it's in the persistent-dirty state.  An immediate
subsequent call to the same pm's makePersistent call will not throw, as the instance is no
longer detached-dirty, it's persistent-dirty.  The JDOUserException is thrown only when the
pm already has an object in the cache with the same identity as the detached instance.  Thus,
multiple calls to makePersistent with the same pc against the same pm will not throw a JDOUserException;
the only case in which makePersistent will throw is when an instance is already in the pm's
cache with the same identity as a detached instance passed to one of that pm's makePersistent/makePersistentAll
methods.

> Draft proposal for CopyOnAttach property
> ----------------------------------------
>
>                 Key: JDO-522
>                 URL: https://issues.apache.org/jira/browse/JDO-522
>             Project: JDO
>          Issue Type: Task
>          Components: api2
>    Affects Versions: JDO 2 maintenance release 1
>         Environment: n/a
>            Reporter: Chris Beams
>            Assignee: Chris Beams
>             Fix For: JDO 2 maintenance release 1
>
>         Attachments: proposal-CopyOnAttach.rtf
>
>
> Minutes: JDO TCK Conference Call Friday, Aug 10, 9 am PDT
> On 8/10/07, Craig L Russell <Craig.Russell@sun.com> wrote:
>     Attendees: Chris Beams, Matthew Adams, Michelle Caisse, Craig Russell
>     Agenda:
>     3. Attach (makePersistent) a detached instance always merges changes
>     into the cache. Can this behavior be changed to make the parameter
>     instance change its state, throwing an exception if there already is
>     an instance in the cache, based on a user-specified property? Seems
>     like this would be a good addition to the spec. AI Chris prepare a
>     proposal for the jdo expert group alias.

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