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

Implementing the fault tolerance mechanisms

Faults and failures are inevitable in a microservice environment. As the numbers of distributed components increase, the number of faults both within each component and those originating from their interactions increase as well. Any microservices application must have built-in resilience for these unfortunate scenarios. In this section, we will explore and implement different ways to handle faults and failures in the Micronaut framework.

Leveraging built-in mechanisms

Micronaut is a cloud-native framework and has built-in capabilities to handle faults and failures. Essentially, its fault tolerance is driven by retry advice. Retry advice offers the @Retryable and @CircuitBreaker annotations that can be used in any HTTP client.

Using @Retryable in an HTTP client

@Retryable is an effortless but effective fault tolerance mechanism – to put it simply, it's used to try again in case of a failure. These try attempts can be...