The synchronous call between two services was the reason both were down. Publishing an event decouples their availability — and makes eventual consistency a business decision.
A thin event carrying only an id forces every consumer to call back for the details, which is a synchronous dependency the event was meant to remove. A…
Publishing an event from a service layer means the aggregate can change state without the event being raised, because the two are in different places and only convention…
Choreography has each service react to events and know nothing about the whole; orchestration has one component call the others in order. The first is presented as the…
The pattern gets introduced alongside event sourcing, separate stores and eventual consistency, which makes it look like an architecture. The idea underneath is smaller: the shape that is…
Saving an order and publishing an event are two systems, and there is no transaction across them. Whichever order they happen in, a failure between them leaves the…
Replacing a direct call with an event feels like removing coupling. The dependency does not disappear — it moves from a line you can read into a subscriber…