SpigotMC/BungeeCord — pull request #613 by Anxuiz (2013-09-09 01:47:06+00:00)
Title: Revise connection throttle to use ConcurrentHashMap.

Not only is the code simpler, but there may be some small performance benefit to using a ConcurrentHashMap in place of a synchronized HashMap. Note I have not done any testing but the logic should be identical.