React when something happens
Day 50 of 149
👉 Full deep-dive with code examples
The Doorbell
You don't stand at the door waiting all day for visitors.
Instead:
- You do your thing
- Doorbell rings → You react!
- Go back to what you were doing
Event-driven architecture works the same way!
The Old Way vs Event-Driven
Old (Polling):
Every second: "Any orders? Any orders? Any orders?"
Wasteful! Constantly checking.
Event-Driven:
*Order comes in* → 🔔 → Process order!
Often works well when there's something to do.
How It Works
Event: "New order created!"
↓
Listeners react:
- Inventory: "I'll update stock"
- Email: "I'll send confirmation"
- Analytics: "I'll log this"
Each service reacts to events it cares about.
Benefits
- 🔌 Loose coupling (services don't know about each other)
- 📈 Scalable (add more listeners anytime)
- ⚡ Real-time (react instantly)
In One Sentence
Event-driven systems react to things that happen instead of constantly checking if something happened.
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