Respository

Fitness for future? No, because evolution is resitant to change and expensive because many compontents depend on a static data model (schema).

What is it about? Centralized data store, with many components.
Two main types of components:
Datastore - holds and represents the system state/data.
Data-use components - components that operate on the central datastore.

Two main classifications of repository:
Database - streams of transactions trigger processes to act on datastore.
Blackboard - current state/ state changes trigger processes.