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https://issues.apache.org/jira/browse/QPID-4886?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13668455#comment-13668455
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Alan Conway commented on QPID-4886:
-----------------------------------
Review at https://reviews.apache.org/r/11378/
The proposal is to leave the const qualifier in QueueObserver, since the name
"observer" implies no change is made to the thing observed.
We will introduce a new interface for entities that need to modify messages as
they go through the system.
> Pass non-const reference to Message in QueueObserver functions.
> ---------------------------------------------------------------
>
> Key: QPID-4886
> URL: https://issues.apache.org/jira/browse/QPID-4886
> Project: Qpid
> Issue Type: Improvement
> Components: C++ Broker
> Affects Versions: 0.23
> Reporter: Alan Conway
> Assignee: Alan Conway
> Fix For: 0.23
>
>
> The HA plugin needs to modify a message in QueueObserver::enqueued to attach
> a HA ID to it. Other plugins may need to similarly annotate messages at
> QueueObserver call points.
> Need to remove the "const" qualifier for Message arguments to QueueObserver
> methods to enable this.
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