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)
Section 1: Core Concepts and Basics
Section 2: Microservices Development
Section 3: Microservices Testing
Section 4: Microservices Deployment
Section 5: Microservices Maintenance
Section 6: IoT with Micronaut and Closure

Understanding Micronaut's OpenAPI

APIs are generic languages for machines to interact with each other. Having an API definition ensures there is a formalized specification in place. All APIs should have a specification, which improves development efficiency and reduces interaction problems. The specifications act as documentation that helps third-party developers or systems to understand the service easily. Micronaut supports OpenAPI (Swagger) YAML at compile time. We learned about this in Chapter 7, Handling Microservices Concerns. The OpenAPI Initiative (OAI) was previously known as the Swagger Specification. It is used to create machine-readable interface files for describing, producing, consuming, and visualizing RESTful web services. The OAI is now a consortium that promotes a vendor-neutral description format. OpenAPI is also called a public API, which is publicly made available to software developers and companies. Open APIs can be implemented with REST APIs or SOAP APIs...