Use cases, event handlers and scheduled jobs

Use cases#

A use case is one command or query of the system, such as Place order, Reserve stock or Get order status. It belongs to one bounded context or to the project, and has:

Event handlers#

An event handler reacts to an event: a domain event of an aggregate or an integration event. It has a description and steps. Use one for "when a payment is captured, confirm the order".

Scheduled jobs#

A scheduled job runs on a schedule written in plain language, such as "every night at 02:00 UTC", and has steps: release expired reservations, send reminders.

Where behaviour sits#

The Behaviour group of the sidebar lists every use case, handler and job of the project; a bounded context's Behaviour tab lists those that belong to it.

Next steps#

• Features and roles→The scenarios that show behaviour from the outside.
• Data contracts, read models and integration events→The payloads, projections and events that behaviour reads and publishes.