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From "Tommaso Teofili (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (JCR-3534) Efficient copying of binaries across repositories with the same data store
Date Tue, 07 May 2013 14:01:17 GMT

     [ https://issues.apache.org/jira/browse/JCR-3534?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tommaso Teofili updated JCR-3534:
---------------------------------

    Attachment: JCR-3534.3.patch

updated patch which introduces special handling of BinaryReferenceMessage in VF.createValue(Binary).

If the reference message holds an existing content id and the signature matches then the referenced
binary is retrieved and returned as the Value.

If either the content id doesn't exist or the signature doesn't match a RepositoryException
is thrown (returning null doesn't seem to be allowed by JCR spec)
                
> Efficient copying of binaries across repositories with the same data store
> --------------------------------------------------------------------------
>
>                 Key: JCR-3534
>                 URL: https://issues.apache.org/jira/browse/JCR-3534
>             Project: Jackrabbit Content Repository
>          Issue Type: New Feature
>          Components: jackrabbit-api, jackrabbit-core
>    Affects Versions: 2.6
>            Reporter: Felix Meschberger
>            Assignee: Tommaso Teofili
>         Attachments: JCR-3534.2.patch, JCR-3534.3.patch, JCR-3534.patch, JCR-3534.patch
>
>
> we have a couple of use cases, where we would like to leverage the global data store
to prevent sending around and copying around large binary data unnecessarily: We have two
separate Jackrabbit instances configured to use the same DataStore (for the sake of this discussion
assume we have the problems of concurrent access and garbage collection under control). When
sending content from one instance to the other instance we don't want to send potentially
large binary data (e.g. video files) if not needed.
> The idea is for the sender to just send the content identity from JackrabbitValue.getContentIdentity().
The receiver would then check whether the such content already exists and would reuse if so:
> String ci = contentIdentity_from_sender;
> try {
>     Value v = session.getValueByContentIdentity(ci);
>     Property p = targetNode.setProperty(propName, v);
> } catch (ItemNotFoundException ie) {
>     // unknown or invalid content Identity
> } catch (RepositoryException re) {
>     // some other exception
> }
> Thus the proposed JackrabbitSession.getValueByContentIdentity(String) method would allow
for round tripping the JackrabbitValue.getContentIdentity() preventing superfluous binary
data copying and moving. 
> See also the dev@ thread http://jackrabbit.markmail.org/thread/gedk5jsrp6offkhi

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