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https://issues.apache.org/jira/browse/QPID-8245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16632089#comment-16632089
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Alex Rudyy commented on QPID-8245:
----------------------------------
[~rgodfrey], I attached patch
{{0007-QPID-8245-Change-decoding-to-decode-only-value-for-t.patch}}
implementing the idea described in your comment above. Could you please have a
look in the patch?
In my patch I re-used existing field {{_properties}} to cache lazily decoded
properties . Your comments and the pseudo-code examples made me thinking that
you considered elimination of existing field {{_properties}} from the field
table. Thus, FiledTable would only have QBB and same caching map. Is it what
you intended to do?
> [Broker-J] [AMQP 0-8..0-91] Decode FiledTable fields on demand
> --------------------------------------------------------------
>
> Key: QPID-8245
> URL: https://issues.apache.org/jira/browse/QPID-8245
> Project: Qpid
> Issue Type: Improvement
> Components: Broker-J
> Affects Versions: qpid-java-broker-7.1.0
> Reporter: Alex Rudyy
> Priority: Major
> Fix For: qpid-java-broker-7.1.0
>
> Attachments:
> 0001-QPID-8245-Broker-J-Stop-rellocating-message-headers-.patch,
> 0002-QPID-8245-Add-factory-methods-to-create-field-table-.patch,
> 0003-QPID-8245-Remove-FiledTable-setters-methods-modifyin.patch,
> 0004-QPID-8245-Decode-field-table-properties-when-require.patch,
> 0005-QPID-8245-Remove-methods-getXXX-in-order-to-simplify.patch,
> 0005-QPID-8245-Split-field-table-into-2-implementations.patch,
> 0006-QPID-8245-some-code-clean-up.patch,
> 0007-QPID-8245-Change-decoding-to-decode-only-value-for-t.patch
>
>
> At the moment all field table properties are decoded when decode
> functionality is invoked. For use cases when only some of the field table
> properties are queried, the decoding functionality can be changed to stop
> decoding on getting the requested property. Potentially, such approach can
> improve the performance of routing transient messages when destinations are
> bound to the routing exchange using selector filters. As filter expression
> contains only some properties, the decoding of message headers can be stopped
> on getting all fields specified in selector expression.
> The idea is illustrated by Rob Godfrey on
> [QPID-8238|https://issues.apache.org/jira/browse/QPID-8238?focusedCommentId=16601936&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16601936]
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