Introduction

Domain Driven Design is an approach to developing software that connects the implementation to an evolving model of the core business concepts. This lesson provides a description of the components in the Application and Model tiers.

Learning Outcomes

• Describe the types of components used in Domain-Driven Design.
• List the responsibilities of Application tier Service components.
• Describe the purpose of Model tier Entity components.
• Describe the purpose of Model tier Value Object components.
• Create appropriate equals and hashCode methods for Model components.

Study Resources

For your study of this topic, use these resources.

Video Lessons

• InfoQ: Power Use of Value Objects in DDD (1hr 1m 27s)

Web Articles and Blogs

• Martin Fowler: EvansClassification
• Martin Fowler: Value Object
• Culttt: What is the difference between Entities and Value Objects?

Books

• Patterns, Principles, and Practices of Domain-Driven Design, by Scott Millett and Nick Tune available on Skillsoft through the RIT Library.
• Domain-Driven Design: Tackling Complexity in the Heart of Software , by Eric Evans
• Domain-Driven Design Quickly by Able Avram and Floyd Marinescu (requires creating an account to get the free PDF)

Wikipedia

• Domain-driven design
• Entity (relational)
• Value Object

Class Lecture

• Domain Driven Design

Exercises

Before-Class Exercises

• Read:
  Chapter 1 - What is Domain-Driven Design ,
  Chapter 15 - Value Objects ,
  and Chapter 16 - Entities from Patterns, Principles, and Practices of Domain-Driven Design.

After-Class Exercises

• Domain Driven Design - individual
  • Click here for the slides for your individual exercise.
  • You will write partial implementations of two classes. Each class will have attributes and implementations of some of methods on the interface as indicated in the exercise description. Your classes must compile so your instructor can test them!
  • By the date shown on the schedule for your section, deposit a zipfile containing the two class files you wrote into the Domain Driven Design - individual dropbox.