Use msg.getSize() rather than getContentHeaderBody in NotificationCheck to 
avoid an  access to persistence layer
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                 Key: QPID-2455
                 URL: https://issues.apache.org/jira/browse/QPID-2455
             Project: Qpid
          Issue Type: Bug
    Affects Versions: 0.5
            Reporter: Sorin Suciu


We have the following sequence in the broker (v.0.5): 
| | | +--NotificationCheck:isMessageSpecific  (org.apache.qpid.server.queue)
| | | +--NotificationCheck$2:notifyIfNecessary        
(org.apache.qpid.server.queue)
| | | | +--SimpleAMQQueue:getMaximumMessageSize       
(org.apache.qpid.server.queue)
| | | | +--AMQMessage:getContentHeaderBody    (org.apache.qpid.server.queue)
| | | | | +--AMQMessage:getStoreContext       (org.apache.qpid.server.queue)
| | | | | +--WeakReferenceMessageHandle:getContentHeaderBody  
(org.apache.qpid.server.queue)
| | | | | | +--WeakReferenceMessageHandle:loadMessageMetaData 
(org.apache.qpid.server.queue)
| | | | | | | +--BDBMessageStore:getMessageMetaData   
(org.apache.qpid.server.store.berkeleydb)

getContentHeaderBody could be replaced with msg.getSize() which would save 
going to BDB. 

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