The reactive system of microservices

To demonstrate how a reactive system of microservices may look if implemented using Vert.x, we are going to create an HTTP server that can accept a REST-based request to the system, send an EventBus-based message to another verticle, receive a reply, and send the response back to the original request.

To demonstrate how it all works, we will also write a program that generates HTTP requests to the system and allows you to test the system from outside.

The HTTP server

Let's assume that the entry point into the reactive system demonstration is going to be an HTTP call. This means that we need to create a verticle that acts as an HTTP server. Vert.x makes this really easy; the following...