Series

Commands, Events, and Processes

Commands ask for work; events record accepted facts. Queues, outboxes, and long-running processes make the difference expensive to ignore.

  1. A Valid Command Can Still Be Refused
  2. A Command Bus Must Pay for Its Indirection
  3. A Queued Command Changes the Contract
  4. CQRS Starts When Reads Need a Different Model
  5. A Domain Event Is a Fact, Not a Question
  6. Publishing Events Is Not Event Sourcing
  7. An Outbox Moves the Failure Window
  8. A Process Manager Remembers What the Queue Cannot
  9. Test Process State, Not Message Choreography