Real-Time Elixir: Customizing Phoenix Channels with GenServer

Building real-time features requires more than just establishing a basic websocket connection; you need to manage state and schedule background tasks efficiently. This text-only course guides you through customizing Elixir Phoenix Channels using the power of OTP and GenServer. You will transition from understanding basic socket connections to implementing robust, stateful communication patterns. By the end of this course, you will be able to schedule recurring tasks—such as token refreshes or periodic data updates—and optimize channel behavior for production-ready applications. What you'll learn: * Learn foundational Elixir OTP concepts, including GenServer lifecycles and Phoenix Channel architecture. * Implement recurring message patterns using built-in Elixir timers to push periodic updates to connected clients. * Manage channel state securely and handle authentication token rotation efficiently. * Configure custom join and leave behaviors to track active user presence and connection health. * Apply modern telemetry and structured logging to monitor channel performance in real time. * Practice writing robust ExUnit tests to verify asynchronous channel behavior and message delivery. The course begins with essential terminology and the core mechanics of Phoenix Channels. You will then progress through step-by-step written explanations and structured exercises to implement stateful GenServer behaviors and schedule recurring tasks. This course is designed for web developers and Elixir beginners who want to deepen their understanding of real-time systems, with no advanced concurrency experience required. Start reading today to master real-time messaging patterns in Phoenix.