Returns the path for this actor (from this actor up to the root actor).
Is the actor shut down? The contract is that if this method returns true, then it will never be false again.
(Since version 2.2) Use context.watch(actor) and receive Terminated(actor)
Sends a one-way asynchronous message.
Comparison takes path and the unique id of the actor cell into account.
Equals takes path and the unique id of the actor cell into account.
Forwards the message and passes the original sender actor as the sender.
Sends the specified message to the sender, i.e.