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 the testing pyramid

The testing pyramid is an easy concept to understand the relative notion of performance, expense, and robustness for the different kinds of testing. The following diagram shows various kinds of testing in the testing pyramid and how much effort is required:

Figure 6.1 – Test pyramid

As depicted in the preceding diagram, unit testing is fast, robust, and inexpensive whereas as we go towards the top of the pyramid, testing becomes sluggish, brittle, and expensive. Though all kinds of testing are required to fully verify whether the application is working as expected, a fine balance is critical to cut expenses and increase robustness and speed. Put simply, have a lot of unit tests, a number of service tests, and very few end-to-end tests. This will ensure quality at a greater speed and with less cost.

In the next section, we will begin the automated testing journey with unit testing.