1. Domain Driven Design Using.NET Dave Rael

2. What’s wrong with this code? Public void CallMethodThatMightThrowScaryException(int carelessInputWithoutValidation) { MethodThatMightThrowScaryException(carelessInputWithoutValidation); } catch (Exception exception) { HandleException(exception); }

3. “There is no try.”

5. Why Domain-Driven? Collaboration Ubiquitous Language Using Composition to address complexity in large systems “Not all of a large system will be well-designed.” –Eric Evans “Is BDD the same as TDD? Yes. If you’re a programmer, and your entire team is programmers, and all your stakeholders are programmers…” –Dan North http://dannorth.net/2012/05/31/bdd-is-like-tdd-if/ http://dannorth.net/2012/05/31/bdd-is-like-tdd-if/

6. The alternative – One database schema to rule them all

7. Pain!

8. Bounded Contexts

9. Bounded Contexts (or Services) (or Silos)

10. Domain-Driven Design Ubiquitous Language Bounded Contexts Domain Events Top-Level System Architecture

11. Domain Driven Design Ubiquitous Language Aggregates CQRS Architecture/Implementation Within a Bounded Context

12. Fitting It Together public interface IDomainDrivenDesign { } public abstract class ServiceOrientedArchitecture : IDomainDrivenDesign { } public class YourDomain : ServiceOrientedArchitecture { }

13. Commands Sent rather than Published Imperative Issued with authority to command (within a bounded context) DestroyPlanetCommand LaunchProtonTorpedoesCommand

14. Events Published rather than Sent Past-tense Describe an event that has already happened “Look what I have done!” PlanetDestroyedEvent ProtonTorpedoesLaunchedEvent UrineDepositedInToiletEvent

15. Commands And Events Bus.Send (); Bus.Reply (); Bus.Publish ();

16. Stuff to Clone Loans https://github.com/raelyard/Loans.git https://github.com/raelyard/Loans.PublicEvents.git Fines https://github.com/raelyard/Fines.git https://github.com/raelyard/Fines.PublicEvents.git http://optimizedprogrammer.com/blog/presentations-on-domain-driven-design

17. You will use a Domain-Driven Design Approach