Book Image

Hands-On Microservices with Kotlin

By : Juan Antonio Medina Iglesias

Book Image

Hands-On Microservices with Kotlin

By: Juan Antonio Medina Iglesias

Overview of this book

With Google's inclusion of first-class support for Kotlin in their Android ecosystem, Kotlin's future as a mainstream language is assured. Microservices help design scalable, easy-to-maintain web applications; Kotlin allows us to take advantage of modern idioms to simplify our development and create high-quality services. With 100% interoperability with the JVM, Kotlin makes working with existing Java code easier. Well-known Java systems such as Spring, Jackson, and Reactor have included Kotlin modules to exploit its language features. This book guides the reader in designing and implementing services, and producing production-ready, testable, lean code that's shorter and simpler than a traditional Java implementation. Reap the benefits of using the reactive paradigm and take advantage of non-blocking techniques to take your services to the next level in terms of industry standards. You will consume NoSQL databases reactively to allow you to create high-throughput microservices. Create cloud-native microservices that can run on a wide range of cloud providers, and monitor them. You will create Docker containers for your microservices and scale them. Finally, you will deploy your microservices in OpenShift Online.

Preface

Who this book is for

What this book covers

To get the most out of this book

Free Chapter

Understanding Microservices

Understanding Microservices

What is a microservice?

Microservices principles

Domain-Driven Design

Reactive microservices

Cloud Native microservices

Getting Started with Spring Boot 2.0

Getting Started with Spring Boot 2.0

Creating a Spring Boot application

Spring Boot application structure

Packaging and running a Spring Boot application

Configuring our application

Creating RESTful Services

Creating RESTful Services

Understanding RestController

Path and request parameters

HTTP verbs and statuses

Working with JSON

Handling errors

Creating Reactive Microservices

Creating Reactive Microservices

Understanding Spring WebFlux

Creating reactive services

Using functional web programming

Handling reactive errors

Reactive Spring Data

Reactive Spring Data

NoSQL databases

Using Spring Data

Reactive repositories

From CRUD to REST

Creating Cloud-Native Microservices

Creating Cloud-Native Microservices

Understanding Spring Cloud

Configuration Server

Service discovery

Creating Dockers

Creating Dockers

Starting with Docker

Building Dockers with microservices

Publishing Dockers

Scaling Microservices

Scaling Microservices

A scalable architecture

Creating a Cloud

Publishing a microservice as a service

Controlling services

Testing Spring Microservices

Testing Spring Microservices

Understanding SpringBootTest

Monitoring Microservices

Monitoring Microservices

Understanding monitoring

SpringBoot Actuator

Java Managing Extensions

Deploying Microservices

Deploying Microservices

Setting things up

Building our application

Publishing to OpenShift

Best Practices

Using Kotlin idioms

Managing the Spring context

Layering the application

Testing effectively

Handling CI and CD

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