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Technically DDD

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Avatar for pelshoff pelshoff
July 06, 2017
Programming
150
1

Technically DDD

Avatar for pelshoff

pelshoff

July 06, 2017

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Transcript

  1. None

  2. Technically DDD DDDDeventer, 2017-07-06 19:45:00.000000

  3. Pim Elshoff developer.procurios.com @pelshoff

  4. None
  5. None

  6. Questions?

  7. None

  8. Context

  9. Value objects

  10. None
  11. None

  12. Value objects • Express a value • Business rules here

    • Immutable • Easy to unit test

  13. Entities

  14. None

  15. Entities • Have identity • More than the sum of

    their attributes • Evolve over time • If there really really really is no VO possible, then business rules here • Slightly harder to test

  16. Services

  17. None

  18. Services • No identity or attributes (Not a “thing”) •

    Cross-concern operations • Business rules that need more data than any single entity knows • Harder to test

  19. Aggregates

  20. None

  21. Aggregates • Collection of objects • Interaction through root •

    If there really really really is no VO possible, then business rules here • Harder to test

  22. Repositories

  23. Repositories • Collection of all objects of a type

  24. final class Address

  25. final class BicycleService

  26. final class StreetAddress

  27. final class Investment

  28. None
  29. None

  30. Meetings cannot end before they start

  31. None
  32. None
  33. None
  34. None
  35. None

  36. Program slots cannot occur in the same room at the

    same time
  37. None
  38. None
  39. None
  40. None
  41. None
  42. None
  43. None
  44. None

  45. Program slots must occur within the duration of the meeting

  46. None

  47. Pim Elshoff developer.procurios.com @pelshoff