In some cases as ie. for events sent between cluster nodes to pass informations from one user session to other user session of same user it is important to address this event to particular node in cluster as if we have user test@example.com connected to nodes node1 with resource res1 and to node2 with resource res2 in case of MessageCarbons we need to notify res2 that on res1 message carbons were enabled. In this case there is no need to forward this event to every cluster node as user session is only on nodes node1 and @node2@.

To do that it would be good to create RoutingEventHandler which could listen for particular event before event is sent and return list/set of nodes to which event should be forwarded.