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https://issues.apache.org/jira/browse/JCR-3534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13604980#comment-13604980
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Jukka Zitting commented on JCR-3534:
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I'm not too excited about the idea of using a special
READ_VALUE_BY_CONTENT_IDENTITY permission for this. It seems like a hack to get
around the inherent security implications of a feature like this.
Instead of exposing this at the JCR API level, to me it would feel more natural
to handle this on a lower level. For example, the following pattern would
require no API extensions or extra permissions, but would still allow the
lower-level implementation to detect that we're talking to two repositories
with the same data store and thus optimize the copying of the data:
Repository repositoryA = ...;
Session sessionA = repositoryA.login(...);
Repository repositoryB = ...;
Session sessionB = repositoryB.login(...);
Binary binary = sessionA.getProperty(...).getBinary();
sessionB.getNode(...).setProperty(..., binary);
> 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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