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I found there is also an Akka actor model, so I am wondering what's the difference between the Akka's Actor and Scala's Actor model?
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Akka Actors The Actor Model provides a higher level of abstraction for writing concurrent and distributed systems. It alleviates the developer from having to deal with explicit locking and thread management, making it easier to write correct concurrent and parallel systems.
An actor is a computational entity that, in response to a message it receives, can concurrently: send a finite number of messages to other actors; create a finite number of new actors; designate the behavior to be used for the next message it receives.
The actor model abstraction allows you to think about your code in terms of communication, not unlike the exchanges that occur between people in a large organization. Use of actors allows us to: Enforce encapsulation without resorting to locks.
The Actor model adopts the philosophy that everything is an actor. This is similar to the everything is an object philosophy used by some object-oriented programming languages, but differs in that object-oriented software is typically executed sequentially, while the Actor model is inherently concurrent.
Well, there isn't. There is just Actor model, and Akka actors and Scala actors are two implementations of that model.
All Actor model says that your concurrency primitives are actors, which can:
receive a message and decide what to do next depending on the content of the message, including:
send messages to any actors they know about
create new actors
and provides certain guarantees, e.g.:
any actor will only handle a single message at a time
messages sent by actor X to actor Y will arrive in the order thay were sent
There is no difference between Scala and Akka actors on this level.
For differences in what they can do, see Different Scala Actor Implementations Overview. The biggest one, for me, is that Akka supports supervisors and ActorRegistry.
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