Book Image

Mastering Spring Boot 2.0

By : Dinesh Rajput
Book Image

Mastering Spring Boot 2.0

By: Dinesh Rajput

Overview of this book

Spring is one of the best frameworks on the market for developing web, enterprise, and cloud ready software. Spring Boot simplifies the building of complex software dramatically by reducing the amount of boilerplate code, and by providing production-ready features and a simple deployment model. This book will address the challenges related to power that come with Spring Boot's great configurability and flexibility. You will understand how Spring Boot configuration works under the hood, how to overwrite default configurations, and how to use advanced techniques to prepare Spring Boot applications to work in production. This book will also introduce readers to a relatively new topic in the Spring ecosystem – cloud native patterns, reactive programming, and applications. Get up to speed with microservices with Spring Boot and Spring Cloud. Each chapter aims to solve a specific problem or teach you a useful skillset. By the end of this book, you will be proficient in building and deploying your Spring Boot application.
Table of Contents (23 chapters)
Title Page
Copyright and Credits
Dedication
Packt Upsell
Contributors
Preface
Index

Using the Hystrix library with a reference implementation


Spring Cloud supports Netflix utilities, and Netflix has produced a library based on the circuit-breaker pattern implementation called Hystrix. In a microservice architecture, we can use the Hystrix library to prevent cascading failures, because it is very common in the microservice architecture to have several individual services hosted on different machines across a network. The microservice-based system has multiple layers of service calls.

In a microservice architecture, the failure of a lower-level service can be caused due to the cascading failure of the whole distributed system. So, Netflix Hystrix provides a way to prevent the failure of a whole system by using fallback calls and the developer can provide a fallback. Each circuit-breaker has its own threshold for failure. In Hystrix, if a particular service is called more than circuitBreaker.requestVolumeThreshold (default: 20 requests) and failure attempt percentage is more...