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From "Rob Godfrey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (QPID-8245) [Broker-J] [AMQP 0-8..0-91] Decode FiledTable fields on demand
Date Tue, 25 Sep 2018 10:52:00 GMT

    [ https://issues.apache.org/jira/browse/QPID-8245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16627149#comment-16627149
] 

Rob Godfrey commented on QPID-8245:
-----------------------------------

So I started playing around with this before I went on vacation.  I don't have that laptop
with me at the moment, but I'll try picking it up again in a couple of days when I get home
(the other aspect from a performance perspective is that if you decode only on a filter query,
you can populate the key with the string from the filter, meaning the filter will do identity
comparisons and won't need to actually compare strings for the most part)

> [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
>
> 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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