Domain Driven Design/Event Sourcing Example

Just another Domain Driven Design and EventSourcing example written in Java.

Some highlights

• The AggregateRoot abstract class provides a mechanism to guarantee the consistency of changes being made internally by forbidding external objects from holding references to its members.
• The AggregateRootEvent and the EntityEvent abstract classes are used to represent respectively a change applied to an AggregateRoot and to an Entity.
• Repositories expose methods for retrieving and saving AggregateRoots by accessing to an EventStore. You can find simple in-memory implementations here.
• In this example, Product and a BacklogItem are two AggregateRoots. ProductBacklogItem is an Entity. StoryPoints is a ValueObject. These implementations are based on "Implementing Domain Driven Design" book written by Vaughn Vernon. You will find some unit tests showing their behaviors and interactions.