Book Image

Developing Java Applications with Spring and Spring Boot

By : Claudio Eduardo de Oliveira, Greg L. Turnquist, Alex Antonov
Book Image

Developing Java Applications with Spring and Spring Boot

By: Claudio Eduardo de Oliveira, Greg L. Turnquist, Alex Antonov

Overview of this book

Spring Framework has become the most popular framework for Java development. It not only simplifies software development but also improves developer productivity. This book covers effective ways to develop robust applications in Java using Spring. The course is up made of three modules, each one having a take-away relating to building end-to-end java applications. The first module takes the approach of learning Spring frameworks by building applications.You will learn to build APIs and integrate them with popular fraemworks suh as AngularJS, Spring WebFlux, and Spring Data. You will also learn to build microservices using Spring's support for Kotlin. You will learn about the Reactive paradigm in the Spring architecture using Project Reactor. In the second module, after getting hands-on with Spring, you will learn about the most popular tool in the Spring ecosystem-Spring Boot. You will learn to build applications with Spring Boot, bundle them, and deploy them on the cloud. After learning to build applications with Spring Boot, you will be able to use various tests that are an important part of application development. We also cover the important developer tools such as AMQP messaging, websockets, security, and more. This will give you a good functional understanding of scalable development in the Spring ecosystem with Spring Boot. In the third and final module, you will tackle the most important challenges in Java application development with Spring Boot using practical recipes. Including recipes for testing, deployment, monitoring, and securing your applications. This module will also address the functional and technical requirements for building enterprise applications. By the end of the course you will be comfortable with using Spring and Spring Boot to develop Java applications and will have mastered the intricacies of production-grade applications.
Table of Contents (34 chapters)
Title Page - Courses
Copyright and Credits - Courses
Packt Upsell - Courses

Chapter 17. WebSockets with Spring Boot

Hell yeah @springboot rocks! (after winning JAX Innovation Award 2016)

Andrew Rubalcaba @Han_Cholo

In the previous chapter, we learned how to split our application into microservices driven by bounded contexts. Yet, we still linked things together in an efficient manner using Spring Cloud.

When it comes to building a social media platform, the standard has been set very high. We all expect dynamic updates to whatever content we view. If someone comments on a topic that we are also viewing, we expect to be alerted to the update immediately. Such fluid changes are made possible through the power of WebSockets.

In this chapter, we will cover the following topics:

  • Publishing saved comments to a chat service
  • Broadcasting saved comments to web subscribers
  • Configuring a WebSocket broker
  • Consuming messages from the web asynchronously
  • Introducing user chatting with channel-wide and user-specific messages

We will use Spring's reactive WebSocket API found in WebFlux...