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


In this chapter, we started things off with some fundamentals of event-driven architecture, discussing two different kinds of event publishing models, which are pub/sub and event streaming. We discussed the core components of each model, as well as the pros/cons of using each model.

Since event streaming was better suited for the pet-clinic application, we dived into event streaming using the Apache Kafka ecosystem. For hands-on exercises, we integrated the pet-clinic-reviews and the pet-clinic microservices using an Apache Kafka topic stream. We verified the integration by creating a new vet review and received the rating in the pet-clinic microservice to update the average rating for a vet.

This chapter has provided you with a solid understanding of event-driven architecture and a practical skillset in implementing an event-streaming system in the Micronaut framework.

In the next chapter, we will explore how we can automate quality testing using built-in as well...