Allow lazy proxy relationships to add or remove elements without triggering a
load
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Key: OPENJPA-2165
URL: https://issues.apache.org/jira/browse/OPENJPA-2165
Project: OpenJPA
Issue Type: New Feature
Components: jdbc, kernel, performance
Affects Versions: 2.3.0, 2.2.1
Reporter: Jeremy Bauer
Assignee: Jeremy Bauer
When adding or removing elements from a non-database-ordered (no order by or
order column - which require strict order to be maintained) lazy proxied
collection which is a relationship to other entities, OpenJPA loads the
collection before performing the operation. This can be very expensive if an
operation is only adding or removing items from the collection. I created a
feature that, when switched on, allows non-indexed add and remove operations to
be performed on a collection without triggering a load. The collection will
get loaded (and reconciled, if necessary) when an operation is performed that
requires a load, such as iteration, size, isEmpty, etc. Currently, the feature
can be enabled for the using this new attribute on the ProxyManager.
<property name="openjpa.ProxyManager" value="delayCollectionLoading=true"/>
The basics have been added to field mappings/metadata such that this could be
enabled on a per-field basis in the future.
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