Stefan Egli created OAK-3145:
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Summary: 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
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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