Hands-On Microservices with Spring Boot and Spring Cloud

An introduction to Spring Reactor

As we mentioned in the Beginning with Spring WebFlux section in Chapter 2, Introduction to Spring Boot, the reactive support in Spring 5 is based on Project Reactor (https://projectreactor.io).  Project Reactor is based on the Reactive Streams specification (http://www.reactive-streams.org), a standard for building reactive applications. Spring Reactor is fundamental and it is what Spring WebFlux, Spring WebClient, and Spring Data rely on to provide their reactive and non-blocking features.

The programming model is based on processing streams of data, and the core data types in Project Reactor are Flux and Mono. A Flux object is used to process a stream of 0...n elements and a Mono object is used to process ...