One Command Multiple Events

[kepboy]

Hi, in the documentation at docs.geteventflow.net there is an FAQ regarding emitting multiple events and being careful.

Subscribers and out of order events - Be very careful if aggregates emit multiple events for a single command, subscribers will almost certainly receive these out of order.

That paragraph contains a link to Out of order events which explains a scenario where a command triggers 2 events and a subscriber of these events publishes another event. And that those events will ultimately be consumed in a (some might say) unintuitive order.

I guess the careful in the original statement relates to being careful that you don't require or expect events to be in a specific order when emitting events from subscribers.

1. Is my point about careful correct?
2. Is the order of events only impacted when a subscriber publishes a command in response to an event? For instance if I publish a command and it emits 4 events, are those four (if you were to exclude any events emitted by subscribers) guaranteed to be in correct order?
3. If I am publishing a single command and emitting multiple events from that single command, are there any other (careful) things, to which, I need to be aware?

Kep

[rasmus]

Hi @kepboy you are correct. How the ordering plays out might be influenced how your domain is setup, so test it to be sure.