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From "Felix Meschberger (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (JCR-3534) Add JackrabbitSession.getValueByContentId method
Date Mon, 18 Mar 2013 12:30:15 GMT

    [ https://issues.apache.org/jira/browse/JCR-3534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13605061#comment-13605061
] 

Felix Meschberger commented on JCR-3534:
----------------------------------------

> 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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