Now that we've seen how the principle functional approach to the implementation of the microservice works, let's change our technological stack and implement the same shop with Akka-HTTP and Akka Persistence. The flow of the discussion for this example will be similar to the one we had about the functional approach—we will start with looking at the way to persist the state of the service and the configuration needed for that. We'll then address the task of actually persisting the data and providing access to it via the HTTP service. As before, we'll conclude our journey by testing the implementation we'll come up with.
Learn Scala Programming
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Learn Scala Programming
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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)
Preface
Free Chapter
An Introduction to Scala 2.13
Understanding Types in Scala
Deep Dive into Functions
Getting to Know Implicits and Type Classes
Property-Based Testing in Scala
Exploring Built-In Effects
Understanding Algebraic Structures
Dealing with Effects
Familiarizing Yourself with Basic Monads
A Look at Monad Transformers and Free Monad
An Introduction to the Akka and Actor Models
Building Reactive Applications with Akka Typed
Basics of Akka Streams
Project 1 - Building Microservices with Scala
Project 2 - Building Microservices with Lagom
Preparing the Environment and Running Code Samples
Assessments
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