Domain-Driven Design Library

This library is a collection of interfaces and abstract classes to express domain-driven design concepts in Java code. Most types in this library are pure marker interfaces and only for documentation purposes. An added benefit is that IDEs can show all implementations of an interface, thus making it easy to discover all implementations of for example Value Objects or Entities.

Pattern representations

Pattern (or Variant)	Implementation in this library	Example in Lakeside Mutual
Layered Architecture	n/a	Top-level packages in Lakeside Mutual backend represents the layers suggested by E. Evans in the "light blue" book
Module	n/a	Java sub-packages in Domain Layer of Lakeside Mutual backends
Entity	Entity	CustomerProfileEntity
Value Object	ValueObject	PolicyPeriod
Service	Service	See layer-specific variants below:
Application Service	ApplicationService	CustomerService
Domain Service	DomainService	InteractionLogService
Infrastructure Service	InfrastructureService	CustomerCoreService
Repository	Repository	CustomerRepository
Factory	Factory	CustomerFactory
Aggregate	Aggregate	CustomerAggregateRoot
Bounded Context	BoundedContext	CustomerCoreApplication
Context Map	n/a	n/a
Subdomain patterns	n/a	n/a

More Information

This website collects pointers to DDD resources, for instance:

• This DDD reference has pattern summaries.
• The DDD community features supporting material.
• InfoQ provides articles and presentations around DDD.

DDD Example(s)

This DDD library was developed for the Lakeside Mutual sample application.

The DDD Sample Application that implements the running example in Eric Evans' Domain-Driven Design is also available on GitHub. It deals with cargo booking, routing and tracking.

The agile project management sample accompanying Implementing Domain-Driven Design by Vaughn Vernon can be found on GitHub as well.