Event-Driven Architecture (EDA)
Design loosely coupled distributed systems around domain events: Event notifications vs Event-Carried State Transfer (ECST), CloudEvents standard, and Choreography vs Orchestration.
01.1. What is Event-Driven Architecture (EDA)?
In an Event-Driven Architecture (EDA), software components communicate primarily by producing, detecting, and reacting to Domain Events (immutable historical facts representing state transitions, such as OrderCreated, PaymentCaptured, or ShipmentDispatched):
- Asynchronous Semantics: The publisher records what happened and broadcasts the event without knowing or expecting who will react to it.
- Inversion of Control: Instead of Service A commanding Service B (
POST /send-email), Service A simply statesOrderPlaced. The Email Service reacts autonomously. - Team Autonomy: Distinct engineering squads can create new microservices and subscribe to existing event streams without scheduling cross-team coordination meetings or altering upstream publisher code.
Thin Event Notification vs Event-Carried State Transfer (ECST)
Thin Event Notification vs Event-Carried State Transfer (ECST)
Enriching event payloads eliminates downstream RPC query storms and guarantees service autonomy.
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