Chapter 8: Real-Time Communication & Notification Systems

Pushing events to users in real time: notification dispatchers, real-time protocols, presence engines, and real-time chat.

• Multi-Channel Notification Dispatchers: Push (APNs, FCM), SMS, Email, and Webhook Architecture
• Real-Time Protocols: WebSockets, Server-Sent Events (SSE), and Long Polling
• Distributed Presence Engines, User State Tracking, and Heartbeat Protocols
• Scalable Real-Time Chat & Collaboration Systems Architecture
• Chapter 8 References