Tommaso Teofili created OAK-2262:
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Summary: Add metadata about the changed value to a
PROPERTY_CHANGED event on a multivalued property
Key: OAK-2262
URL: https://issues.apache.org/jira/browse/OAK-2262
Project: Jackrabbit Oak
Issue Type: Improvement
Components: core, jcr
Affects Versions: 1.1.2
Reporter: Tommaso Teofili
Assignee: Michael Dürig
When getting _PROPERTY_CHANGED_ events on non-multivalued properties only one
value can have actually changed so that handlers of such events do not need any
further information to process it and eventually work on the changed value; on
the other hand _PROPERTY_CHANGED_ events on multivalued properties (e.g.
String[]) may relate to any of the values and that brings a source of
uncertainty on event handlers processing such changes because there's no mean
to understand which property value had been changed and therefore to them to
react accordingly.
A workaround for that is to create Oak specific _Observers_ which can deal with
the diff between before and after state and create a specific event containing
the "diff", however this would add a non trivial load to the repository because
of the _Observer_ itself and because of the additional events being generated
while it'd be great if the 'default' events would have metadata e.g. of the
changed value index or similar information that can help understanding which
value has been changed (added, deleted, updated).
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