Implement Message Filtering

[abhinava]

I'm looking for some suggestions on how (and if) message filtering can be implemented. Specifically, how can an Actor implement some sort of message filtering where unless an actor (X) explicitly enables "reception", it will not be able to receive messages. This would apply to both ActorRef based tell() or ask() as well as via ActorProxy.

The filtering can be on the recipient side where the actor to whom the message is destined to, won't have it's on_receive() triggered unless the reception is Enabled. In this scenario, the sender doesn't know about the receiver's Enable/Disable state of reception and would assume that the message was delivered to the receiver. Alternately, the sender's tell(), ask() or the proxy method can fail if the receiver has not yet Enabled reception.

Any suggestions on how this can be done would be really helpful! I can think of a few ways how this can be achieved but this is all application logic. Any native-Pykka (or close to it) way of doing it will be nice.