Event-Driven Architecture (EDA)

Systems that react to events.

“Fire and forget.”

Decoupled communication.

graph LR
    P[Producer] -->|Event| B[Broker/Bus]
    B -->|Event| C1[Consumer 1]
    B -->|Event| C2[Consumer 2]

When to use

  • High Throughput.
  • Loose Coupling.
  • Asynchronous Workflows.

Explanation

Components publish “Events” (“OrderPlaced”) to a Bus. Consumers subscribe to events.

Pros and Cons

Pros Cons
  • Decoupling
    		•
  • Hard to trace flow
    		•
  • Scalability
    		•
  • Eventual Consistency
    		•

    Code example

    Typescript (Node.js EventEmitter)