Hands-On Reactive Programming in Spring 5

Building applications with @EventListener

To play with the Publish-Subscribe pattern in Spring Framework, let's do an exercise. In turn, assume that we have to implement a simple web service that shows the current temperature in the room. For this purpose, we have a temperature sensor, which sends events with the current temperature in Celsius from time to time. We potentially want to have both mobile and web applications, but for the sake of conciseness, we are implementing only a simple web application. Furthermore, as questions of communication with microcontrollers are out of the scope of this book, we are simulating a temperature sensor using a random number generator.

To make our application following the reactive design, we cannot ...