Grokking Modern Software Architecture Styles
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Event-driven Architecture

Know the Vocabulary

This lesson uses the terms below repeatedly. Read them once now and return here when a later section needs one.

  • Event: An immutable record of something that happened in the past, such as OrderPlaced. It names what happened and carries some data about it, from a single ID to the full details.
  • Command: A request for something to happen, addressed to one recipient, such as ReserveInventory. Unlike an event, the recipient can reject it.

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