Project Reactor

As explained in Spring Security in Action, Second Edition

Project Reactor is a Java library that provides reactive programming types and operators for composing asynchronous streams.

Project Reactor is a Java library that implements Reactive Streams and provides a functional API for composing asynchronous streams in Spring’s reactive programming model. section 17.1

Use its core types to model reactive web endpoints:

• Return Mono for a publisher that produces a single value, such as a HelloController endpoint returning Mono.just("Hello!"). section 17.1
• Use Flux alongside Mono when working with publishers of reactive data streams. section 17.1

Reactive endpoint

A Spring web endpoint can return Mono<String> and produce its response with Mono.just("Hello!"). The reactive web dependency enables Project Reactor classes and interfaces.

Figure 17.1 Non-reactive vs. reactive. In a non-reactive approach, the milk factory gets all the milk to be packaged in the morning and delivers all the boxes in the evening. In a reactive approach, as the milk is brought to the factory, it’s packaged and then delivered. For this scenario, a reactive approach is better as it allows milk to be collected throughout the day and delivered sooner to the clients.

Compare reactive processing, which collects and delivers work progressively, with non-reactive processing, which waits for the complete batch. section 17.1

How Spring Security in Action, Second Edition covers it

How deep it goes

Defines Reactive Streams roles and demonstrates a Mono endpoint, but stops short of detailed operator or scheduling internals.

Examples

Uses a milk-factory analogy, a HelloController endpoint, curl invocation, and Mono.just("Hello!") output.

What it assumes

Assumes basic Java and Spring web development while introducing Reactive Streams publishers and subscribers.

What you can do after

Build a simple reactive web endpoint using Spring WebFlux and Reactor’s Mono publisher.

How it connects

Connects Reactive Streams, Publisher, Subscriber, Mono, Flux, Spring WebFlux, and Spring’s reactive programming model.

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  Spring in Action, Sixth EditionProject Reactor is a Java library that provides reactive types and operators for asynchronous, nonblocking stream processing.

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Related concepts

• reactive streamimplements · Reactive Streams is a standard defining interfaces and signaling rules for asynchronous stream processing with nonblocking backpressure between producers and consumers.
• Fluxused by · Flux is a Project Reactor publisher type representing an asynchronous sequence that emits zero or more ordered values.
• Spring Reactive Webused by · Spring Reactive Web, or Spring WebFlux, is Spring’s reactive web framework for building nonblocking HTTP applications and clients.
• reactive programminguses · Reactive programming is a programming paradigm in which computations and outputs respond to asynchronous events or changing data by propagating changes through dependent operations.
• Springused by · Spring Framework is an open-source Java application framework that provides infrastructure and programming models for building applications, including dependency injection, configuration, and web and data-access capabilities.
• Monohas part · Mono is a Project Reactor publisher type representing an asynchronous computation that emits zero or one item.

This explainer was generated by Manning's knowledge graph from the text of Spring Security in Action, Second Edition. The section links point to the parts of the book it draws on.