Vert.x and XtendVert.x is a framework for asynchonous, scalable, concurrent applications. It’s conceptually very similar to node.js but runs on the JVM leveraging its native support for multiple threads. Its programming model is based on a tell don't ask paradigm, that is you never wait for responses (and thereby block the current thread), but tell what to do as soon as a response is available by passing a handle
