The event-sourced domain model uses domain events exclusively for modeling the aggregates’ lifecycles. All changes to an aggregate’s state have to be expressed as domain events. Each operation on an event-sourced aggregate follows this script: Load the aggregate’s domain events. Reconstitute a state representation—project the events into a state representation that can be used to make business decisions. Execute the aggregate’s command to execute the business logic, and consequently, produce new domain events. Commit the new domain events to the event store.
