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

Using Spring Cloud Gateway

There are three basic concepts around Spring Cloud Gateway:

  • Route: That is the basic building block of the gateway. It consists of a unique ID for identifying a route, a destination URI, a list of predicates, and a list of filters. A route is matched only if all the predicates have been fulfilled.
  • Predicates: These are the logic that is executed before processing each request. It is responsible for detecting whether the different attributes of the HTTP request, such as headers and parameters, match the defined criteria. The implementation is based on the Java 8 interface java.util.function.Predicate<T>. The input type is in turn based on Spring's org.springframework.web.server.ServerWebExchange.
  • Filters: They allow the modification of the incoming HTTP request or outgoing HTTP response. They may be modified before or after sending the downstream request. Route filters are scoped to a particular route. They implement Spring's org.springframework.web.server.GatewayFilter...