Pub/sub messaging explained: pattern and use cases

Publish-subscribe (pub/sub) is a messaging pattern where publishers send messages to a named topic without knowledge of the subscribers, while subscribers listen to topics of interest without knowing the message source, with a broker facilitating delivery. Unlike point-to-point message queues, pub/sub uses a fan-out pattern to distribute each message to all subscribers, with delivery methods being either push or pull. Various technologies implement pub/sub, such as Google Cloud Pub/Sub, which is fully managed and globally distributed, AWS SNS combined with SQS for fan-out and queuing, Apache Kafka for persistent log and event sourcing, and Redis Pub/Sub for lightweight, in-memory messaging without persistence. The pattern is particularly useful in automation workflows where multiple systems need to independently react to the same event, exemplified by a webhook from Stripe triggering a CodeWords workflow that processes and disseminates results to multiple downstream systems.

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