Async Event Dispatcher in Rust

Introduction In this article, we'll build a simple event dispatcher in Rust. Our goal is to create a system that allows events to be handled asynchronously by multiple listeners, ensuring flexibility and thread safety. By the end, you'll have a reusable event dispatcher that can be integrated into larger Rust applications. This article is for beginner and intermediate Rust developers who are familiar with async programming, traits, and basic concurrency concepts like Arc and Mutex. Here's what we want in our event dispatcher: An extensible event model The event dispatcher should handle events asynchronously Event listeners should handle events asynchronously It should be easy to use Event handling should be idempotent What we definitely don't want: Priority for event listeners Listeners blocking or canceling other listeners Nice-to-have features (but out of scope): Error handling Logging/tracing Motivation Async: Most applications are asynchronous, and we want to create a tool that is