Event-Driven

Building a real-time note-sharing application is a perfect use case for exploring event-driven architecture. In this comprehensive guide, we’ll build a production-ready system with two microservices (User and Note services) that communicate through NATS, delivering instant updates to a Vue.js frontend. Why Event-Driven Architecture? Traditional request-response patterns create tight coupling between services. When your Note service needs to notify users about changes, you don’t want to make synchronous HTTP calls to every service that cares about notes. Event-driven architecture solves this with loose coupling: ...

The Tight Coupling Problem Imagine your game needs to handle player damage. The naive approach couples everything together: func TakeDamage(player *Player, damage int) { player.Health -= damage // Tightly coupled to UI ui.UpdateHealthBar(player.Health) // Tightly coupled to audio audio.PlaySound("hurt.wav") // Tightly coupled to achievements if player.Health <= 10 { achievements.Unlock("NEAR_DEATH") } // Tightly coupled to analytics analytics.TrackEvent("player_damaged", damage) } // Problem: Adding any system requires modifying this function // Problem: Testing becomes nightmare // Problem: Can't disable/enable systems easily The Observer pattern and Event Buses solve this by decoupling event producers from consumers. ...