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From "Jukka Zitting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JCR-890) concurrent read-only access to a session
Date Wed, 23 Jun 2010 07:27:50 GMT

    [ https://issues.apache.org/jira/browse/JCR-890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12881593#action_12881593
] 

Jukka Zitting commented on JCR-890:
-----------------------------------

The SessionOperation mechanism is meant to synchronize only session-related JCR API calls,
so unlike with XA transactions there should never be a need for two threads to use the same
lock concurrently. I'm using a java.util.concurrent lock instead of a synchronized block only
to enable more accurate logging of potential concurrency problems.

> concurrent read-only access to a session
> ----------------------------------------
>
>                 Key: JCR-890
>                 URL: https://issues.apache.org/jira/browse/JCR-890
>             Project: Jackrabbit Content Repository
>          Issue Type: Improvement
>          Components: jackrabbit-core
>            Reporter: David Nuescheler
>            Assignee: Jukka Zitting
>             Fix For: 2.2.0
>
>         Attachments: session-class-move-norename.patch, session-class-move.patch
>
>
> Even though the JCR specification does not make a statement about Sessions shared across
a number of threads I think it would be great for many applications if we could state that
sharing a read-only session is supported by Jackrabbit.
> On many occasions in the mailing lists we stated that there should not be an issue with
sharing a read-only session, however I think it has never been thoroughly tested or even specified
as a "design goal".
> If we can come to an agreement that this is desirable I think it would be great to start
including testcases to validate that behaviour and update the documentation respectively.

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