Software Architecture Concepts
Event-Driven Architecture
| Entity | Description |
|---|---|
| Events | Notification of an action |
| Producers | Components/Services that generate or publish messages |
| Consumers | Components/Services that subscribe or consume messages |
| Event Bus | Central hub that facilitates communication |
| PROS | CONS |
|---|---|
| Loose Coupling | Higher Complexity |
| Easier Scalability | Harder Testing and Debugging |
| Service Resilience | Possible eventual Inconsistency |
| Retriable Process | Challenging Obersavability |
| Real-time data flow | Need mindset shift |
Use Cases
- e-commerce : order place, inventory update, trigger shipping, log analytics
- social media :
Best Practices
- Define clear event schemas
- Make consumer idempotent - receive same event more than once, In distributed systems - duplicate can and will happen
- if consumer processes order event twice and ships 2 packages then its a costly bug
- Implement Robust Error Handling - use retries, dead-letter queue or fallback logic to prevent cascading failures
- Monitor and log your events - track flow of events, how long things take and capture failures
- helps indebugging, performance tuning and even security monitoring