[jira] [Closed] (OAK-3145) Allow plugging in additional jcr-descriptors

["Davide Giannella (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/OAK-3145?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Davide Giannella closed OAK-3145.
---------------------------------

Bulk close for 1.3.4

> 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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