Add new option to eliminate reflection calls from enhancer generated IdClass PC
copy operations
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Key: OPENJPA-2120
URL: https://issues.apache.org/jira/browse/OPENJPA-2120
Project: OpenJPA
Issue Type: Improvement
Components: Enhance, kernel, performance
Affects Versions: 2.2.0
Reporter: Jeremy Bauer
Assignee: Jeremy Bauer
Profiling has shown the code in the enhancer generated
pcCopyKeyFields(To/From)ObjectId to be costly when using id classes with an
entity that uses field access and has non-public fields. Without public
fields, reflection is used to move the values from the parent entity to the id
class. This also involves a costly temporary access switch.
I have a fix that interrogates the id class for a public constructor and uses
that constructor (instead of costly reflection) during the copy operation. It
only works for certain IdClass and entity combinations. IdClasses must have a
trivial public constructor with parameters that match those of the id fields.
Trivial = the constructor can only do direct field assignments from the
parameter values to the id class values. No conversion can take place. The
constructor can have other logic, but the assignments must be direct. The
entity ids cannot be derived from other identities. If these conditions are
not met, the enhancer falls back to using reflection.
Since this change could result in an application behavior change (the provider
calling a new constructor) it is gated by the openjpa.OptimizeIdCopy property,
with the default being false.
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