Strategischer Anwendungsentwurf mit Domain-Driven Design
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Presented at dotnet-zentral.ch on March 18th 2013 by Dennis Traub
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Strategischer Anwendungsentwurf mit Domain-Driven Design
- 1. Strategischer Anwendungsentwurf mit Domain-Driven Design presented by Dennis Traub .NET Usergroup Zentralschweiz - 18. März 2013 Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 2. Now, who‘s that guy? Dennis Traub Founder, Owner, CEO, Single Employee of D. Traub Software Development Consultancy Consultant, developer, trainer, speaker 39 years old Married, father of one 20+ years in software development Hire me at mail@dennistraub.de @dtraub Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 3. AGENDA The Blue Book An Example Break Tactical Patterns Actually it should Bounded Contexts A short review of be two books! and Subdomains the Building Blocks 1 2 3 4 5 6 Terminology Lasagna End of Strategic Design … the new Spaghetti Questions & Answers Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 4. AGENDA The Blue Book An Example Tactical Patterns Actually it should Bounded Contexts A short review of be two books! and Subdomains the Building Blocks 1 2 3 4 5 6 Terminology Lasagna End of Strategic Design … the new Spaghetti Questions & Answers Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 5. The „Blue Book“ by Eric Evans Image Placeholder Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 6. The „Blue Book“ by Eric Evans • Entities • Value Objects Tactical • Aggregates Class • Repositories Design • Services • Factories • etc. It should be two books! • Model Integrity • Large-Scale Structure • Bounded Contexts Strategic • Core Domain DDD • Context Maps • Ubiquitous Language • etc. Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 7. AGENDA The Blue Book An Example Tactical Patterns Actually it should Bounded Contexts A short review of be two books! and Subdomains the Building Blocks 1 2 3 4 5 6 Terminology Lasagna End of Strategic Design … the new Spaghetti Questions & Answers Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 8. Domain Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 9. Domain a sphere of knowledge, influence, or activity Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 10. Domain what an organization does and the world it does it in Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 11. Domain Model Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 12. Domain Model a system of abstractions that describes selected aspects of a domain Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 13. Domain Model can be used to solve problems related to that domain Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 14. don‘t model reality Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 15. we model useful abstractions of reality Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 16. Ubiquitous Language Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 17. Ubiquitous Language a language structured around the domain model Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 18. Ubiquitous Language used by all team members Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 19. Bounded Context Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 20. Bounded Context an explicit boundary within which a domain model exists Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 21. Bounded Context inside the boundary all terms have specific meaning Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 22. Bounded Context these terms are part of the context‘s ubiquitous language Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 23. Subdomains Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 24. Subdomains the whole domain of the organization is comprised of subdomains Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 25. Subdomains they focus on only one specific area of the whole business domain Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 26. Core Domain Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 27. Core Domain the distinctive part of the model, central to the users‘ goals Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 28. Core Domain differentiates the application and makes it valuable Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 29. Core Domain the most important subdomain Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 30. AGENDA The Blue Book An Example Tactical Patterns Actually it should Bounded Contexts A short review of be two books! and Subdomains the Building Blocks 1 2 3 4 5 6 Terminology Lasagna End of Strategic Design … the new Spaghetti Questions & Answers Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 31. Our Domain: Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 32. Aviation Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 33. Our Application: Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 34. Ambulance Flight Management Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 35. Ambulance Flight Management order flights from an operator dispatch patients assign medical staff Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 36. Bounded Contexts 1 Patiententransport-Disposition 2 Flugplanung und -durchführung 3 Personaleinsatzplanung (Flugärzte, Rettungsassistenten) 4 Patientendaten, Abrechnung, Buchhaltung 5 SOAP- oder REST-Services, Web-Oberfläche Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 37. Subdomains 1 Ambulanzflug-Disposition 6 Bodentransport 2 Flotten-Management 7 Abrechnung, Buchhaltung 3 Flugplanung 8 Anwendungsoberfläche 4 Passagier-/Patientendaten 9 SOAP-/REST-Schnittstelle 5 Medizinisches Personal 10 Benutzer- und Zugriffssteuerung Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 38. don‘t build a model that works for everyone Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 39. to focus our effort and resources we ask two questions for each subdomain Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 40. 1 how complex is it? Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 41. 2 what‘s the value to our specific problem? (if we model it ourselves) Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 42. 1. Complexity (S/M/H) 1 Ambulanzflug-Disposition 6 Bodentransport 2 Flotten-Management 7 Abrechnung, Buchhaltung 3 Flugplanung 8 Anwendungsoberfläche 4 Passagier-/Patientendaten 9 SOAP-/REST-Schnittstelle 5 Medizinisches Personal 10 Benutzer- und Zugriffssteuerung Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 43. 2. Value (S/M/H) 1 Ambulanzflug-Disposition 6 Bodentransport 2 Flotten-Management 7 Abrechnung, Buchhaltung 3 Flugplanung 8 Anwendungsoberfläche 4 Passagier-/Patientendaten 9 SOAP-/REST-Schnittstelle 5 Medizinisches Personal 10 Benutzer- und Zugriffssteuerung Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 44. the tactical Building Blocks we don‘t use DDD when there is no value in formalizing the problem Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 45. we only use DDD in parts where we get a competitive advantage Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 46. 15 minutes BREAK Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 47. AGENDA The Blue Book An Example Tactical Patterns Actually it should Bounded Contexts A short review of be two books! and Subdomains the Building Blocks 1 2 3 4 5 6 Terminology Lasagna End of Strategic Design … the new Spaghetti Questions & Answers Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 48. Presentation Layer Common Services Infrastructure Application Services Domain / Business Model / BLL DAL / O/R-Mapper Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 49. Ports & Adapters Hexagonal Architecture Onion Architecture Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 50. Dependency Inversion Principle (just in case) the D in SOLID Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 51. AGENDA The Blue Book An Example Tactical Patterns Actually it should Bounded Contexts A short review of be two books! and Subdomains the Building Blocks 1 2 3 4 5 6 Terminology Lasagna End of Strategic Design … the new Spaghetti Questions & Answers Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 52. Entity Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 53. Entity an object primarily defined by its identity Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 54. Entity has a life cycle that can radically change its form and content Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 55. Value Object Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 56. Value Object an object that represents a descriptive aspect of the domain Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 57. Value Object doesn‘t have a distinct identity treated as immutable Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 58. Aggregate Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 59. Aggregate a cluster of associated objects Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 60. Aggregate treated as a unit for the purpose of data changes Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 61. Aggregate a set of consistency rules applies within the aggregate‘s boundaries Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 62. Aggregate enforces its own invariants and is always in a valid state Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 63. AGENDA The Blue Book An Example Tactical Patterns Actually it should Bounded Contexts A short review of be two books! and Subdomains the Building Blocks 1 2 3 4 5 6 Terminology Lasagna End of Strategic Design … the new Spaghetti Questions & Answers Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 64. To summarize: DDD is basically the application of the SOLID principles of object-orientation on an architectural level Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 65. ? QUESTIONS Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de
- 66. THANK YOU! follow me: @dtraub Dennis Traub – Software Development Consultancy @dtraub – mail@dennistraub.de