Building Blocks

Processes #

• Models a lifetime of an entity.
• Described by a state machine.
• State changes in response to Commands or Events.
• Publish Events on state change.
• Retain history of events for auditing, inspection.
• Uses versioning/etags to ensure data integrity.
• Uses CQRS interfaces.

Data Objects #

• Models the current state and properties of an entity.
• Described as a hierarchical data model (a document).
• State changes in response to Create, Update, Delete (CRUD) operations, that replaces the entire object of parts thereof.
• Publish a “Created”, “Updated” of “Deleted” event on state changes.
• Retain history of versions for auditing.
• Uses versioning/etags to ensure data integrity.
• Uses CQRS or CRUD interfaces.

Audit Records #

• Models the history of the state and properties of an entity.
• Described as a hierarchical data model (a document).
• Can only be created, not modified or deleted.
• Typically only created in response to an event, and do not need to publish themselves.
• Uses sequence indicators to ensure order correctness.

Reports #

• Models an aggregated view of a collection of entities.
• Representation depends on context.
• Calculated data.
• Typically generated by another entity, which is responsible for publishing events if needed.