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  • I understand. But what about error handling (and reporting) to the clients in this scenario? Commented Jun 2, 2016 at 9:15
  • I mean, how do I report back to REST clients errors which occur when handling the UserCreated event (for example, duplicate username or email or database outage). Commented Jun 2, 2016 at 10:09
  • It depends on where you're performing the action. If you're inside the user system, you can do all your validation, writing to data store there, then publish the event. Otherwise, I see it as perfectly acceptable to perform a standard HTTP request to the /users/ endpoint, and allow that system to publish its event if it succeeded, and respond to the request with the new entity Commented Jun 2, 2016 at 10:40