Messaging and asynchronous patterns are completely natural with microservices, but a lot of the start of the art material concentrates on HTTP, JSON and REST. This document is about "Message-driven Microservices" with Spring. It tracks the convergence of various ideas that are floating around in Spring Cloud, Spring Boot and Spring XD.
There is already a spring-xd-module-runner project where we started experimenting with allowing user to develop and run an XD module locally. We can extrapolate from there to a more flexible model that leads optionally to a deployable XD module, but can also be used to form more flexible structures than a simple "stream".
Just create MessageChannels "input" and/or "output" and add @EnableMessageBus and run your app as a Spring Boot app (single application context). You need to connect to the physical broker for the bus, which is automatic if the relevant bus implementation is available on t