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From "Chetan Mehrotra (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OAK-3145) Allow plugging in additional jcr-descriptors
Date Wed, 29 Jul 2015 10:15:04 GMT

    [ https://issues.apache.org/jira/browse/OAK-3145?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14645832#comment-14645832
] 

Chetan Mehrotra commented on OAK-3145:
--------------------------------------

bq. the whiteboard/tracker pattern doesn't seem to support the push model

The suggested approach is to always use {{Tracker.getServices()}} instead of calling it once
at init call. This call is cheap as it does not perform a lookup (pull) at time of call. Instead
it keeps track of registered services via ServiceTracker. For an example see {{WhiteboardIndexProvider}}

> Allow plugging in additional jcr-descriptors
> --------------------------------------------
>
>                 Key: OAK-3145
>                 URL: https://issues.apache.org/jira/browse/OAK-3145
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 1.3.3
>            Reporter: Stefan Egli
>            Assignee: Stefan Egli
>            Priority: Minor
>             Fix For: 1.3.4
>
>         Attachments: OAK-3145.patch, OAK-3145.v2.patch
>
>
> The current way oak compiles the JCR descriptors is somewhat hard-coded and does not
allow an easy way to extend it. Currently oak-jcr's {{RepositoryImpl.determineDescriptors()}}
uses oak-core's {{ContentRepositoryImpl.createDescriptors()}} ones and overwrites a few (in
{{JCRDescriptorsImpl}}). The result of this is then put into the {{RepositoryImpl.descriptors}}
field - which is subsequently used.
> While these descriptors can explicitly be overwritten via {{put}}, that all has to happen
within overwriting code of the {{RepositoryImpl}} hierarchy. There's no plug-in mechanism.
> Using the whiteboard pattern there should be a mechanism that allows to provide services
that implement {{Descriptors.class}} which could then be woven into the {{GeneralDescriptors}}
in use by {{ContentRepositorImpl}} for example. The plugin mechanism would thus allow hook
in Descriptors as 'the base' which are still overwritten by oak-core/oak-jcr's own defaults
(to ensure the final say is with oak-core/oak-jcr) - as opening up such a *Descriptors-plugin
mechanism could potentially be used by 3rd party code too*.
> PS: this is a spin-off of OAK-2844



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