It depends on how you want to handle message passing. Would your architecture be simpler if you could decouple your sender and receiver? It can make it harder t

It depends on how you want to handle message passing. Would your architecture be simpler if you could decouple your sender and receiver? It can make it harder to track errors (as in, where the message came from, determining who is listening to it, or tracking down circular logic), but it does give you some very nice options for decoupling. I would strongly suggest looking through the design patterns used in Twitter Flight, which is a framework based largely on an evented system.