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

Integrating with persistence in the Micronaut framework

To exhibit integration with persistence (database) in the Micronaut framework, we will work on three different microservices within the pet-clinic application:

Figure 2.1 – Microservices in the pet-clinic application

Hibernate and MyBatis are persistence frameworks for relational databases, whereas to integrate with NoSQL (MongoDB), we will use its native synchronous driver.

In the following sections, we will cover each integration technique by doing hands-on work with the respective microservice. Each microservice (for the scope of this chapter) will be componentized into the following types of components:

  • Entity: To encapsulate ORMs
  • Repository: To encapsulate interaction to the underlying Hibernate framework
  • Service: To contain any business logic as well as concierge calls to the downstream repository
  • CLI client: To connect create-read-update-delete (CRUD) requests to the...