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https://issues.apache.org/jira/browse/QPID-268?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rob Godfrey reassigned QPID-268:
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Assignee: Rob Godfrey
> [Performance] Changes to code generated by code generator for performance
> improvements
> --------------------------------------------------------------------------------------
>
> Key: QPID-268
> URL: https://issues.apache.org/jira/browse/QPID-268
> Project: Qpid
> Issue Type: Improvement
> Components: Java Common
> Reporter: Rob Godfrey
> Assigned To: Rob Godfrey
> Fix For: M2
>
> Attachments: qpid-268.patch
>
>
> Testing has shown that we can get not insignificant performance improvements
> by changing the code generated by the code generator.
> Firstly we can reduce the overhead of object creation by removing unnecessary
> string concatenation in using strings for lookups. That is - no longer use a
> String representation of the protocol version to do lookups.
> Secondly we can create AMQMethodBody objects with a constructor which takes
> in the byte buffer, and gets the object to populate itself from this, rather
> than first creating an empty object and then asking it to populate itself.
> The first course of action seems to allow the run-time compiler to
> optimize-out some aspects of the the object creation.
> Thirdly we can change the way the generated classes ask for their packed bit
> arrays to be encoded and decoded. Instead of creating temporary boolean[]
> objects, we process the packing into byte objects in place.
> The changes also allow further performance improvements to be made later by
> changing the way objects are looked up in the registries. For instance, in
> the MainRegistry the template could now be changed to allow looking up the
> MethodBody objects in a sparse multi-dimensional array, rather than a Long
> indexed HashMap. This can now be done purely by changing the template and
> without having to change the code generator.
> See attached patch file.
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