Book Image

Kotlin Design Patterns and Best Practices - Second Edition

By : Alexey Soshin
Book Image

Kotlin Design Patterns and Best Practices - Second Edition

By: Alexey Soshin

Overview of this book

This book shows you how easy it can be to implement traditional design patterns in the modern multi-paradigm Kotlin programming language, and takes you through the new patterns and paradigms that have emerged. This second edition is updated to cover the changes introduced from Kotlin 1.2 up to 1.5 and focuses more on the idiomatic usage of coroutines, which have become a stable language feature. You'll begin by learning about the practical aspects of smarter coding in Kotlin, as well as understanding basic Kotlin syntax and the impact of design patterns on your code. The book also provides an in-depth explanation of the classical design patterns, such as Creational, Structural, and Behavioral families, before moving on to functional programming. You'll go through reactive and concurrent patterns, and finally, get to grips with coroutines and structured concurrency to write performant, extensible, and maintainable code. By the end of this Kotlin book, you'll have explored the latest trends in architecture and design patterns for microservices. You’ll also understand the tradeoffs when choosing between different architectures and make informed decisions.
Table of Contents (17 chapters)
1
Section 1: Classical Patterns
6
Section 2: Reactive and Concurrent Patterns
11
Section 3: Practical Application of Design Patterns

Chapter 11: Reactive Microservices with Vert.x

In the previous chapter, we familiarized ourselves with the Ktor framework. We created a web service that could store cats in its database.

In this chapter, we'll continue working on the example from the previous chapter, but this time using the Vert.x framework and Kotlin. Vert.x is a Reactive framework that is built on top of Reactive principles, which we discussed in Chapter 7, Controlling the Data Flow. We'll list some of the other benefits of the Vert.x framework in this chapter. You can always read more about Vert.x by going to the official website: https://vertx.io.

The microservice we'll develop in this chapter will provide an endpoint for health checks – the same as the one we created in Ktor – and will be able to delete and update the cats in our database.

In this chapter, we will cover the following topics:

  • Getting started with Vert.x
  • Routing in Vert.x
  • Verticles
  • Handling...