Building an Event-Driven Architecture in Clojure (Part 1)

Clojure, a functional programming language that runs on the Java Virtual Machine, provides built-in facilities for building event-driven architectures. In this article, the author explores two types of publish/subscribe techniques in Clojure: watches and channels. While watches are first-class observers, channels are part of Clojure's core.async library. The author demonstrates how to create an event bus using a core.async channel and a topic function. They also discuss the concept of decoupling event receiving and processing using an event bus, and how to segregate events based on attributes or shape. This article serves as a blueprint for developers looking to build event handling services in Clojure.