Publish-subscribe

Producers publish events to a topic without knowing who consumes them, and every subscriber receives its own copy. New features subscribe without touching the producer.

Where it shows up in real systems

  • Pub/sub topic

    Producers publish once without knowing who listens; each subscriber processes the event independently. Fan-out multiplies downstream load by the number of subscribers.

    In production: Amazon SNS, Google Cloud Pub/Sub, Azure Event Grid, NATS

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