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https://issues.apache.org/jira/browse/JCR-3534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13605061#comment-13605061
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Felix Meschberger commented on JCR-3534:
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> suggested getValueByContentId() method wouldn't work with Oak
So JackrabbitValue.getContentIdentifier will not be supported in Oak, either ?
> I'd adjust the deployment configuration if you want to make those
> repositories share data more intimately.
How if clustering is not an option ?
Consider for example, I have an author box and a publish box. For various
reasons both share the same Data Store. The straight forward approach to send
binaries from the author box to the publish box would be to extract the binary
from the Data Store on the author box and push it back in to the Data Store on
the publish box, just for the Data Store to realize the binary is actually the
same. On the reading side we can retrieve an identifier
(JackrabbitValue.getContentIdentifier). I just need a way to reuse the binary
data referred to by that content Identifier on the publish side.
> Add JackrabbitSession.getValueByContentId method
> ------------------------------------------------
>
> 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
> Attachments: 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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