code: private void updateLowestPriority(short messagePriorty)
     {
        if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.entry(this, tc, "updateLowestPriority", ""+messagePriorty);
        
        // Only update the priority if it is lower than what we
        // already have stored
        if (messagePriorty < this.lowestPriority)
        {
           this.lowestPriority = messagePriorty;
        }
        
        if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.exit(this, tc, "updateLowestPriority");
     }
docs: Updates the sessions lowest message priority. This method is used
  to keep track of the lowest priority message that we have sent on this
  session. We need this so that when we flow a close() we can
  ensure that it will reach the server after any messages.
  
  @param messagePriorty