Let's recap what we've learned in this chapter.
Current scaling demands are hard to meet using traditional approaches. The actor model with its shared nothing paradigm offers a solution to this problem. Akka is a library for building actor-based applications on the JVM.
Actors communicate by sending and receiving messages and change their internal state and produce side-effects in response. Each actor has an address in the form of an ActorRef, which also encapsulates ab actor's mailbox and a dispatcher. Actors are organized into hierarchies where parent actors are responsible for the supervision of their children.
Actors have a well-defined life cycle and implement a number of methods, which are called at appropriate moments during their lifetimes.
Akka provides additional modules that extend provided functionality even further.
We also looked at Akka...
