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)

Running the application

Please refer to Appendix A, Preparing the Environment and Running Code Samples, if you don't have Java and SBT installed yet.

We will run our application in the terminal by using two separate terminal sessions for Shop and Bakery. It is possible to run both by issuing one of the two following commands in the corresponding shell:

  • sbt "runMain ch11.Store"
  • sbt "runMain ch11.Bakery"

In our code, we do not handle the StateTimeout for the Shopping/ShoppingList state. Therefore, it is mandatory to start the store session first and after it loads and starts to accept connections stating that the bakery session can be started.

It is also possible to use an approach documented in Appendix A, Preparing the Environment and Running Code Samples, to run the code from within the SBT session and choose the appropriate main class after that...