Fraser Adams created QPID-4543:
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             Summary: QMF queueMoveMessages method returns "InvalidParameter" 
exception when there are simply no messages available to move from the source 
queue - this is confusing.
                 Key: QPID-4543
                 URL: https://issues.apache.org/jira/browse/QPID-4543
             Project: Qpid
          Issue Type: Bug
          Components: C++ Broker
    Affects Versions: 0.18
         Environment: QMF
            Reporter: Fraser Adams
            Priority: Minor


QMF queueMoveMessages method returns "InvalidParameter" exception when there 
are simply no messages available to move from the source queue - this is 
confusing.

Other queue management commands (such as purge and reroute on the queue object) 
don't object when there are no messages to move but queueMoveMessages barfs 
with InvalidParameter.


This is inconsistent and it's pretty unhelpful, I spent about an hour checking 
over my code and looking through the broker code thinking I'd messed up the 
arguments. When I finally got round to actually adding some messages "just to 
see" it actually worked. Perhaps I should have tried that sooner, but as I say 
purge and reroute don't behave this way so it was fairly reasonable to assume 
I'd done something wrong...

I personally think that queueMoveMessages should behave the same as purge and 
reroute and attempt to move whatever. It should only send back InvalidParameter 
if one of the parameters is actually invalid. It could be argued that trying to 
move zero messages is invalid, but a qty value of 0 means "all messages" and 
all of zero is zero.






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