deduplicate NodePropertyChangeOperations in ROP commit
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Key: CAY-971
URL: https://issues.apache.org/cayenne/browse/CAY-971
Project: Cayenne
Issue Type: Improvement
Components: Cayenne Core Library
Reporter: Ari Maniatis
Assignee: Andrus Adamchik
In ROP, NodePropertyChangeOperation events are sent from the client to the
server on commit. These make up a ObjectContextChangeLog and are applied in
order on the server. However this results in excess network traffic in
situations where the client application might update attributes many times
before commit. In our case, we update on every keystroke.
Currently, ObjectContextChangeLog is an ArrayList of GraphDiffs
(NodePropertyChangeOperations in this situation). Markers seem to also separate
groups of GraphDiffs (is this for rollback and nested transactions?)
Should this become an ArrayList of markerGroups, each of is a
Map<ObjectAttribute, GraphDiff> and therefore redundant events will not end up
in the ObjectContextChangeLog? Or is this too simplistic...
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