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

Summary

In this chapter, we have built a well-tested service using Kotlin that uses the Ktor framework to store entities in the database. We've also discussed how the multiple design patterns that we encountered at the beginning of this book, such as Factory, Singleton, and Bridge, are used in the Ktor framework to provide a flexible structure for our code.

Now, you should be able to interact with the database using the Exposed framework. We've learned how we can declare, create, and drop tables, how to insert new entities, and how to fetch and delete them.

In the next chapter, we'll look at an alternative approach to developing web applications, but this time using a Reactive framework called Vert.x. This will allow us to compare the concurrent and Reactive approaches for developing web applications and discuss the tradeoffs of each of the approaches.