- abstract class Receptionist extends Extension
Register and discover actors that implement a service with a protocol defined by a ServiceKey.
- final class ReceptionistSetup extends ExtensionSetup[Receptionist]
- abstract class ServiceKey[T] extends AbstractServiceKey
A service key is an object that implements this trait for a given protocol T, meaning that it signifies that the type T is the entry point into the protocol spoken by that service (think of it as the set of first messages that a client could send).