Move JMSXUserID creation to client to improve broker performance
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                 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: Martin Ritchie
             Fix For: M3


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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