Book Image

Learn Scala Programming

By : Slava Schmidt
Book Image

Learn Scala Programming

By: Slava Schmidt

Overview of this book

The second version of Scala has undergone multiple changes to support features and library implementations. Scala 2.13, with its main focus on modularizing the standard library and simplifying collections, brings with it a host of updates. Learn Scala Programming addresses both technical and architectural changes to the redesigned standard library and collections, along with covering in-depth type systems and first-level support for functions. You will discover how to leverage implicits as a primary mechanism for building type classes and look at different ways to test Scala code. You will also learn about abstract building blocks used in functional programming, giving you sufficient understanding to pick and use any existing functional programming library out there. In the concluding chapters, you will explore reactive programming by covering the Akka framework and reactive streams. By the end of this book, you will have built microservices and learned to implement them with the Scala and Lagom framework.
Table of Contents (19 chapters)

Advanced topics

Up until now, we have implemented our bakery by relying on basic Akka concepts. It is time to deepen our knowledge and start to use higher level concepts.

Akka FSM

The Manager pushes the cookie-making process forward by coordinating all other inhabitants of the bakery. It does so by taking the messages representing job results from one actor and passing them further along to an appropriate successor. It is important that this process is consequent, that is, it should be impossible to make raw cookies at the moment since we only have a shopping list and no dough. We'll represent this behavior as a state machine.

An FSM is an abstraction defined by a set of states the machine can be in. For each state,...