[QPIDJMS-104] avoid iterating a likely-empty collection on arrival of each message

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.4.0
• Fix Version/s: 0.5.0
• Component/s: qpid-jms-client
• Assignee: Robbie Gemmell
• Reporter: Robbie Gemmell
• Created: 27/Aug/15 10:33
• Updated: 06/Jan/16 12:33
• Resolved: 27/Aug/15 10:39

Description

There is a connection listener mechanism to allow listening for certain events about the connection, one of these being the arrival of a message. Given it is likely the listener collection may be empty, we should avoid attempting to iterate the collection on the arrival of each message if there are actually no listeners.