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Lesson 2: Event-Driven Thinking

Simple Explanation​

What it is​

Event-driven thinking means you design your system around things that happen (events) and let multiple services react independently.

Why we need it​

Direct request chains slow down under load. Events break the chain so work can be queued, retried, and scaled without blocking the user.

Benefits​

  • Faster responses because the user does not wait for every task.
  • Independent scaling for each consumer.
  • Easy extension when you add new consumers later.

Tradeoffs​

  • More complexity in tracing and debugging.
  • Eventual consistency across data updates.
  • Idempotency required to handle duplicate deliveries.

Real-world examples (architecture only)​

  • Order placed → Event → Billing, Inventory, Email in parallel.
  • File uploaded → Event → Virus scan, resize, metadata extraction.

This lesson is under development. For now, use the Foundation track Lesson 2 for the full content.

Project (Cloud-Agnostic)​

Describe an event-driven workflow with one producer, one broker, and two consumers.

Deliverables:

  1. Define the event and producer.
  2. Choose the broker.
  3. Describe the two consumers.

If you want feedback, email your write-up to maarifaarchitect@gmail.com.

References​