This control service has a single stream processor function that listens for specific events and reacts by emitting more events using event-first Event Sourcing. The events it listens for are described in the transitions metadata, which essentially defines the state machine of a long-lived business process. Each business process is implemented as an autonomous control service that orchestrates the collaboration between a set of completely decoupled boundary services. Each boundary service involved in the collaboration defines the set of events it produces and consumes independently of the other services. The control service provides the glue that brings these services together to deliver a higher value outcome.
The downstream ...
