Focus on the essece with Domain-Driven Design
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Stop solving the wrong problem and focus on the essence with Domain-Driven Design. This talk show a typical complicated solution to an online store pricing problem, and how the problem can be solved simplier with DDD. You'll also find out how to start with DDD right now.
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Focus on the essece with Domain-Driven Design
- 1. Svaťa Šimara Stop Solving the Wrong Problem Focus on the Essence Stop Solving the Wrong Problem Focus on the Essence Domain-Driven Design
- 4. • Clean • SOLID • TDD • 12factor • CQRS • DDD • ... Perfect Code
- 10. VIP Price
- 11. Price Lists
- 12. Price Lists
- 13. Store is Slow
- 14. Price Calculation as DB Function
- 16. You Solve Everyday Issues
- 18. Store is Slowing Down
- 19. The DB Function is Slow
- 22. New Programmer
- 23. • Why is pricing so coplicated? New Programmer
- 24. • Why is pricing so coplicated? • Why is not the price changed immediatelly? New Programmer
- 25. • Why is pricing so coplicated? • Why is not the price changed immediatelly? • Why isn’t the pricing tested? New Programmer
- 26. • Why is pricing so coplicated? • Why is not the price changed immediatelly? • Why isn’t the pricing tested? • Why is the price problem solved partially in DB, PHP, CRON? New Programmer
- 27. • Why is pricing so coplicated? • Why is not the price changed immediatelly? • Why isn’t the pricing tested? • Why is the price problem solved partially in DB, PHP, CRON? • I don’t want to deal with pricing, I would break something New Programmer
- 28. You are Solving the Wrong Problem
- 29. Current Problems
- 31. You’ll Never End
- 32. Solution?
- 33. Change the Way You Deal with Problems
- 34. What?
- 35. Start Asking
- 36. What does it mean? What is the concept?
- 37. How do you use it? What are use-cases?
- 38. How do you call it? Does the concept even exist?
- 39. What really customer needs?
- 40. What is his domain?
- 41. Domain
- 42. • Area • Terms • Rules • From customer’s point of view Domain
- 43. Domain in the Store Story
- 44. • The pricing domain is partially in – PHP – Database – CRON – Programmer’s head Online Store Domain
- 45. How did It happen?
- 46. Small Shop: Product with Price
- 47. ✔ Small Shop: Product with Price
- 48. Need for VIP Price
- 49. Why does he need more prices?
- 50. How does he call them?
- 51. What is he achieving?
- 52. Instead of
- 53. You End Up with
- 54. • Regular Price • VIP Price You End Up with
- 55. • NO Price List concept You End Up with
- 56. • NO Price List concept • NO Database function You End Up with
- 57. • NO Price List concept • NO Database function • NO problems you’ve been solving all the time You End Up with
- 58. • Different mental model • Simpler model – Testable – Easy to explain – Maintanable – Changable You End Up with
- 59. • Different mental model • Simpler model – Testable – Easy to explain – Maintanable – Changable You End Up with
- 60. That’s the Point of DDD
- 61. Beat Complexity
- 64. DDD is Change of Thinking
- 65. Change is Not Easy
- 66. How Can You Start
- 68. How to Start Right Now
- 69. • Stop thinking about – DB structure How to Start Right Now
- 70. • Stop thinking about – DB structure – DB and data at all How to Start Right Now
- 71. • Stop thinking about – DB structure – DB and data at all – Framework you use How to Start Right Now
- 72. • Stop thinking about – DB structure – DB and data at all – Framework you use – Tools you know How to Start Right Now
- 73. • Ask questions How to Start Right Now
- 74. • Ask questions – Like 5 years old baby How to Start Right Now
- 75. • Ask questions – Like 5 years old baby – Fow who is it? How to Start Right Now
- 76. • Ask questions – Like 5 years old baby – Fow who is it? – What? How to Start Right Now
- 77. • Ask questions – Like 5 years old baby – Fow who is it? – What? – Why? How to Start Right Now
- 78. • Ask questions – Like 5 years old baby – Fow who is it? – What? – Why? • Solve problem on the paper first How to Start Right Now
- 79. • Ask questions – Like 5 years old baby – Fow who is it? – What? – Why? • Solve problem on the paper first • Use domain terms How to Start Right Now
- 80. • Ask questions – Like 5 years old baby – Fow who is it? – What? – Why? • Solve problem on the paper first • Use domain terms • Don’t abstract How to Start Right Now
- 81. DDD is Not
- 82. • Architecture – Hexagonal – Onion DDD is Not
- 83. • Architecture – Hexagonal – Onion • CQRS DDD is Not
- 84. • Architecture – Hexagonal – Onion • CQRS • Event Sourcing DDD is Not
- 85. • Architecture – Hexagonal – Onion • CQRS • Event Sourcing • Technology DDD is Not
- 86. • Architecture – Hexagonal – Onion • CQRS • Event Sourcing • Technology • Framework • … DDD is Not
- 87. • Domain DDD is
- 88. • Domain • Domain terms DDD is
- 89. • Domain • Domain terms • Use Cases DDD is
- 90. • svatasimara.cz • Series of articles • Examples in PHP • On-line lecture (czech) Sources