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https://issues.apache.org/jira/browse/OAK-1120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13809162#comment-13809162
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Michael Dürig commented on OAK-1120:
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Currently there is no way to set up Oak with a custom {{Observer}}.
> Enhance observation mechanism to support Apache Sling
> -----------------------------------------------------
>
> Key: OAK-1120
> URL: https://issues.apache.org/jira/browse/OAK-1120
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: core
> Reporter: Carsten Ziegeler
> Attachments: OAK-1120.patch
>
>
> The current way the jcr listener work in Sling is not optimal as it reads
> each and every changed node. So I think it really would be great if we could
> directly get the information from Oak without the need to additionally
> process.
> The listener currently:
> 1. Compacts observation events into node added, node changed, and node
> removed events - it also collects added/changed/removed properties from the
> events.
> 2. For every added and changed node, it reads the node and the primary node
> type, the sling:resourceType and sling:resourceSuperType property
> 3. There is a special case, if a node has been added/changed with the name
> "jcr:content" and the parent node is a file node, then the parent node is
> reported as changed/added.
> I've no idea how the current diff mechanism works in Oak, but I would assume
> that the information for 1. are similar to the result of the diff. I would
> hope that the properties for 2. are there as well as they need to be diffed
> against the old value. 3. is more tricky and specific, and I think it would
> be ok if we would do this in Sling as the ratio of files vs other content is
> pretty low usually.
> If Oak could provide this information, we could leverage that in Sling and
> would remove the additional reads - which clearly is an improvement. This
> would require zero changes in applications based on Sling. If Sling is run on
> Oak, this implementation is used, otherwis the current JCR based on is used.
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