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From "Jukka Zitting (JIRA)" <j...@apache.org>
Subject [jira] Updated: (JCR-584) Improve handling of concurrent node modifications
Date Thu, 16 Nov 2006 13:57:41 GMT
     [ http://issues.apache.org/jira/browse/JCR-584?page=all ]

Jukka Zitting updated JCR-584:
------------------------------

    Fix Version/s: 1.2
                       (was: 1.1.1)

> Improve handling of concurrent node modifications
> -------------------------------------------------
>
>                 Key: JCR-584
>                 URL: http://issues.apache.org/jira/browse/JCR-584
>             Project: Jackrabbit
>          Issue Type: Improvement
>          Components: core
>            Reporter: Stefan Guggisberg
>         Assigned To: Stefan Guggisberg
>             Fix For: 1.2
>
>
> consider the following scenario:
> - session1 modifies node /a by adding a child node b
> - session2 modifies node /a by adding a child node c
> - session2 saves its changes 
> - session1 tries to save its changes which results in a InvalidItemStateException
> this behavior is in accordance with the spec. the spec however doesn't prevent a 
> more lenient handling of this scenario.
> if the concurrent modifications are non-conflicting and trivial the changes could
> be silently merged in session1's transient state of node /a.
> examples for trivial non-conflicting changes:
> - s1 adds child node a, s2 removes child node b
> - s1 adds child node a, s2 adds child node b
> - s1 adds child node a, s2 adds mixin type
> examples for non-trivial and/or conflicting changes:
> - s1 removes child node a, s2 removes child node a
> - s1 adds child node a, s2 adds child node a
> - s1 adds sns child node a (-> a[3]), s2 adds sns child node a (-> a[3])
> - s1 adds sns child node a (-> a[3]), s2 removes sns child node a[1]
> - s1 removes sns child node a[2], s2 reorders child nodes affecting sns nodes a

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