Book Image

Mastering Spring Cloud

By : Piotr Mińkowski
Book Image

Mastering Spring Cloud

By: Piotr Mińkowski

Overview of this book

Developing, deploying, and operating cloud applications should be as easy as local applications. This should be the governing principle behind any cloud platform, library, or tool. Spring Cloud–an open-source library–makes it easy to develop JVM applications for the cloud. In this book, you will be introduced to Spring Cloud and will master its features from the application developer's point of view. This book begins by introducing you to microservices for Spring and the available feature set in Spring Cloud. You will learn to configure the Spring Cloud server and run the Eureka server to enable service registration and discovery. Then you will learn about techniques related to load balancing and circuit breaking and utilize all features of the Feign client. The book now delves into advanced topics where you will learn to implement distributed tracing solutions for Spring Cloud and build message-driven microservice architectures. Before running an application on Docker container s, you will master testing and securing techniques with Spring Cloud.
Table of Contents (22 chapters)
Title Page
Copyright and Credits
Packt Upsell

The circuit breaker pattern with Hystrix

We have already discussed the different implementations of load balancer algorithms in Spring Cloud Netflix. Some of them are based on monitoring the instance response time or the number of failures. In these cases, a load balancer makes decisions about which instance should be invoked based on these statistics. The circuit breaker pattern should be treated as an extension of that solution. The main idea behind a circuit breaker is very simple. A protected function call is wrapped in a circuit breaker object, which is responsible for monitoring a number of failure calls. If the failures reach a threshold, the circuit is opened, and all further calls will be failed automatically. Usually, it is also desirable to have some kind of monitor alert if a circuit breaker trips. Some crucial benefits derived from the usage of the circuit breaker pattern in your applications are the ability to continue operating when a related service fails, the prevention...