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From "Andrew Stitcher (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PROTON-1505) Message header defaults only work if no header present
Date Thu, 25 Jan 2018 18:00:00 GMT

    [ https://issues.apache.org/jira/browse/PROTON-1505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16339561#comment-16339561
] 

Andrew Stitcher commented on PROTON-1505:
-----------------------------------------

I don't think that addressing point 2 of the issues is part of the design of proton:

Proton is essentially about messaging semantics (albeit low level messaging semantics) rather
than frame level details. From a semantic point of view there is no difference between the
priority header fieldĀ  being absent and the priority value being 4. So I see no reason to
expose the absence of the field.

> Message header defaults only work if no header present
> ------------------------------------------------------
>
>                 Key: PROTON-1505
>                 URL: https://issues.apache.org/jira/browse/PROTON-1505
>             Project: Qpid Proton
>          Issue Type: Bug
>          Components: proton-c
>            Reporter: Kim van der Riet
>            Assignee: Andrew Stitcher
>            Priority: Major
>              Labels: codec
>             Fix For: proton-c-0.21.0
>
>
> An error in the qpid-interop-tests JMS headers test showed that where there is no message
priority on the wire, the C++ and Python client APIs do not return the default value as mandated
by the AMQP spec. In particular, the priority is returned with a value of 0 rather than the
default value of 4.
> This raises two issues:
> 1. Setting the default value (in particularly for priority, where a priority system may
be adopted that is not default, and the missing value may need to have a value other than
4). 
> 2. (C++) Gaining access to the transport headers so that there is an ability to distinguish
between the default and the value being actually present on the wire.



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