Create the actual router, responsible for routing messages to routees.
Java API: get the singleton instance
Is the message handled by the router head actor or the #routingLogicController actor.
Dispatcher ID to use for running the “head” actor, which handles supervision, death watch and router management messages
Possibility to define an actor for controlling the routing logic from external stimuli (e.g.
Check that everything is there which is needed.
Overridable merge strategy, by default completely prefers