Book Image

Building Microservices with Micronaut®

By : Nirmal Singh, Zack Dawood
Book Image

Building Microservices with Micronaut®

By: Nirmal Singh, Zack Dawood

Overview of this book

The open source Micronaut® framework is a JVM-based toolkit designed to create microservices quickly and easily. This book will help full-stack and Java developers build modular, high-performing, and reactive microservice-based apps using the Micronaut framework. You'll start by building microservices and learning about the core components, such as ahead-of-time compilation, reflection-less dependency injection, and reactive baked-in HTTP clients and servers. Next, you will work on a real-time microservice application and learn how to integrate Micronaut projects with different kinds of relational and non-relational databases. You'll also learn how to employ different security mechanisms to safeguard your microservices and integrate microservices using event-driven architecture in the Apache Kafka ecosystem. As you advance, you'll get to grips with automated testing and popular testing tools. The book will help you understand how you can easily handle microservice concerns in Micronaut projects, such as service discovery, API documentation, distributed configuration management, fallbacks, and circuit breakers. Finally, you'll explore the deployment and maintenance aspects of microservices and get up to speed with the Internet of Things (IoT) using the Framework. By the end of this book, you'll be able to build, test, deploy, and maintain your own microservice apps using the framework.
Table of Contents (20 chapters)
1
Section 1: Core Concepts and Basics
3
Section 2: Microservices Development
8
Section 3: Microservices Testing
10
Section 4: Microservices Deployment
13
Section 5: Microservices Maintenance
15
Section 6: IoT with Micronaut and Closure

Using Micronaut's HTTP server APIs

The Micronaut framework offers a non-blocking HTTP server based on Netty. These server APIs can be leveraged to address some useful microservice requirement scenarios. To do any hands-on work, we will continue with the pet-owner microservice.

At the outset, we must have the following Maven dependency in the project POM:

…
<dependency>
<groupId>io.micronaut</groupId>
<artifactId>micronaut-http-server-netty</artifactId>
<scope>compile</scope>
</dependency>
…

This dependency should already be in the pet-owner project. In the next sections, we will explore some useful configurations in the HTTP server world.

Binding HTTP requests in the Micronaut framework

There are several ways we can bind arguments to an HTTP request in the Micronaut framework:

  • @Body: As discussed before, @Body binds the argument from the body of the HTTP request.
  • @CookieValue: This binds...