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)

Essentials of microservices

When discussing microservices, it is better to start with the question of size. Evidently, software systems are growing in size in response to increasing demands from users. The number of features, their complexity and sophistication grow and so do the lines of code in software projects. Even in well-structured living systems, the size of components and their number is getting bigger over time. Given limited human mental capabilities, the proportion of the system that is understood by a single programmer shrinks, which leads to the increased number for developers in the team. Bigger team size leads to the growth of the communication overhead and so less time for writing code, leading to the need for additional developers, which introduces a self-reinforced cycle.

The traditional monolithic way to build systems as a single project with a single deployment...