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https://issues.apache.org/jira/browse/QPID-943?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12635423#action_12635423
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Rajith Attapattu commented on QPID-943:
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Gordon has reviewed the c++ patch.
I agree with Rob about making it an option to not set the userid. 
Also another thing to note is that in the C++ broker will only validate the 
message if a userid is present.
Rob what are your thoughts on doing the same with the java broker to make it 
consistent with the c++ broker?

I also need to add a test for both java and c++ brokers.

> Move JMSXUserID creation to client to improve broker performance
> ----------------------------------------------------------------
>
>                 Key: QPID-943
>                 URL: https://issues.apache.org/jira/browse/QPID-943
>             Project: Qpid
>          Issue Type: Improvement
>          Components: Java Broker, Java Client
>    Affects Versions: M2.1
>            Reporter: Marnie McCormack
>            Assignee: Rajith Attapattu
>             Fix For: M4
>
>         Attachments: c++broker_userid_check.patch, 
> javabroker_userid_check.patch, JMSXUserID.patch
>
>
> Summary: 
> Currently the broker modifies the message to add the JMSXUserID. A better 
> approach would be to have the client encode that detail and have the broker 
> verify that it is correct. This means that the broker does not have to 
> re-encode every message. It also allows the sending client to decide if they 
> wish to include the JMSXUserID for validation. 
> Proposed Changes: 
> Removing existing modification code replacing with validation if the 
> JMSXUserID is present. If validation is required to pass then close the 
> connection on failures. 
> Augment to client to have the ability to manuall or automatically set the 
> JMSXUserID based on the authenticated connection. 
> Test Strategy: 
> Test messages with manual user id creation(correct and incorrect), automatic 
> user id creation. 
> Test broker in validation mode and lenient mode. 
> Testing should include performance metrics to quantify the inpact of the 
> additional processing.

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