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From "Jeremy Bauer (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (OPENJPA-2165) Allow lazy proxy relationships to add or remove elements without triggering a load
Date Wed, 28 Mar 2012 15:45:27 GMT
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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