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https://issues.apache.org/jira/browse/JCR-3534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13634985#comment-13634985
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Jukka Zitting commented on JCR-3534:
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> public API
+1 for createValue(Binary), with an abstract ReferenceBinary class (one that
holds and provides access to a HMAC code, but doesn't know how to access the
underlying value) in something like jackrabbit-jcr-commons where it can be
shared by the client and the server. That class can either be used directly by
client code or extended by RMI and DAVex to allow seamless integration without
the client code having to worry about the HMAC codes.
> I'm not sure about spec compliance, but createValue(Binary) could return null
> if the binary isn't available on the target system.
A better alternative might be to throw a RepositoryException from methods like
setProperty(String, Value) and setProperty(String, Binary), when given such a
reference binary that actually doesn't match the underlying data store and
whose getStream() method for some reason can't be used to fetch the raw byte
stream.
> 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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