Ddd reboot (english version)
20 May 2016•0 j'aime•2,987 vues
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Ingénierie
Introduced by Eric Evans in 2004 via his Blue Book, Domain Driven Design (DDD) has received tremendous positive feedbacks from many developers & communities over the years. On the other hand, we have to admit that DDD has since not been widely used in the trenches or within most of our development projects... How can we explain such failure in its diffusion? Is DDD in itself difficult or is it just the way people used to present it which makes it hard to grasp and inaccessible? Through our various (more or less successful ;-) experiences, we will try to highlight what DDD is using a simple and more accessible approach. The opportunity for us is to show you how helpful it can be for your day-to-day projects. Wouldn't be the perfect time for all of us to ease the DDD onboarding for beginners and to reboot DDD for experts?
Thomas PierrainSuivre
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Ddd reboot (english version)
- 1. #DDDREBOOT LET’S REBOOT DDD! THOMAS PIERRAIN - JEREMIE GRODZISKI @TPIERRAIN - @JGRODZISKI
- 2. #DDDREBOOT LET’S REBOOT DDD! THOMAS PIERRAIN - JEREMIE GRODZISKI @TPIERRAIN - @JGRODZISKI
- 3. #DDDREBOOT BEFORE WE BEGIN
- 4. #DDDREBOOT#DDDREBOOT
- 5. #DDDREBOOT DDD AROUND YOU? OK, BUT 13 YEARS AFTER… #DDDREBOOT
- 6. #DDDREBOOT THERE MUST BE A REASON…
- 7. #DDDREBOOT « TACTICAL PATTERNS », « BOUNDED CONTEXTS », « UBIQUITOUS LANGUAGE », ETC. #DDDREBOOT DOES IT NOT MEAN ANYTHING TO YOU?
- 8. #DDDREBOOT#DDDREBOOT
- 9. #DDDREBOOT ACTUALLY DDD…
- 10. #DDDREBOOT DOMAIN DRIVEN DESIGN, IS…
- 11. #DDDREBOOT TO FOCUS ON BUSINESS VALUE
- 12. #DDDREBOOT OUR FIRST WORK AS DEVELOPER? UNDERSTAND THE DOMAIN THAT WE’LL HAVE TO CODE
- 13. #DDDREBOOT A SET OF CONCEPTS THAT, THROUGH USE CASES, ALLOWS US TO SOLVE PROBLEMS DOMAIN?
- 14. #DDDREBOOT DOMAIN: DOUBLE ENTRY ACCOUNTING SOLVED PROBLEMS: TRACKING, ROBUSTNESS CONCEPTS: ACCOUNT, DEBIT, CREDIT, AMOUNT, ETC.
- 15. #DDDREBOOT DOMAIN: IDE SOLVED PROBLEMS: PRODUCTIVITY, INTEGRATION CONCEPTS: PROJECTS, FILES, ANALYSIS, REFACTORING, CVS, DEBUGGER, ETC.
- 16. #DDDREBOOT BUT DDD IS MOSTLY…
- 17. #DDDREBOOT #DDDREBOOT
- 18. #DDDREBOOT
- 19. #DDDREBOOT AS DEVELOPERS, WE FACE …
- 20. #DDDREBOOT 3 LEVELS
- 21. #DDDREBOOT IS / COMPANY APPLICATION / TEAM CODE / PAIR
- 22. #DDDREBOOT IS / COMPANY APPLICATION / TEAM CODE / PAIR
- 23. #DDDREBOOT IS / COMPANY APPLICATION / TEAM CODE / PAIR
- 24. #DDDREBOOT LEVEL 1 IS / COMPANY APPLICATION / TEAM CODE / PAIR
- 25. #DDDREBOOT QUESTION: WHAT’S THE FOLLOWING CODE DOES?
- 26. #DDDREBOOT
- 27. #DDDREBOOT SO? #DDDREBOOT
- 28. #DDDREBOOT DID YOU SEE SOME CODE SMELLS?
- 29. #DDDREBOOT Good code / Bad code
- 30. #DDDREBOOT #1 MAGIC NUMBERS
- 31. #DDDREBOOT #1 MAGIC NUMBERS #2 DUPLICATIONS
- 32. #DDDREBOOT #1 MAGIC NUMBERS #2 DUPLICATIONS #3 PRIMITIVE OBSESSION
- 33. #DDDREBOOT #1 MAGIC NUMBERS #2 DUPLICATIONS #3 PRIMITIVE OBSESSION #4 MIXED CONCERNS (TECH-BIZ)
- 34. #DDDREBOOT #1 MAGIC NUMBERS #2 DUPLICATIONS #3 PRIMITIVE OBSESSION #4 MIXED CONCERNS (TECH-BIZ) #5 FUZZY TERMINOLOGY (
- 35. #DDDREBOOT AND NOW CONCERNING THE DOMAIN…
- 36. #DDDREBOOT LET’S FIND THE IMPLICITS !
- 37. #DDDREBOOT FREE SHIPPING IF GREATER THAN 100? 100 WHAT?
- 38. #DDDREBOOT FIXED SHIPMENT COST? FREE SHIPPING IF GREATER THAN 100? 100 WHAT?
- 39. #DDDREBOOT FIXED SHIPMENT COST? FREE SHIPPING IF GREATER THAN 100? 100 WHAT? WEIGHT IN G? VARIABLE COST FOR EACH SENT KG?
- 40. #DDDREBOOT CURRENCY IN EUROS? FIXED SHIPMENT COST? WEIGHT IN G? VARIABLE COST FOR EACH SENT KG? FREE SHIPPING IF GREATER THAN 100? 100 WHAT?
- 41. #DDDREBOOT CURRENCY IN EUROS? FIXED SHIPMENT COST? WEIGHT IN G? VARIABLE COST FOR EACH SENT KG? SHIPPING OPTION? FREE SHIPPING IF GREATER THAN 100? 100 WHAT?
- 42. #DDDREBOOT CURRENCY IN EUROS? FIXED SHIPMENT COST? WEIGHT IN G? VARIABLE COST FOR EACH SENT KG? SHIPPING OPTION? FREE SHIPPING IF GREATER THAN 100? 100 WHAT? VARIABLE COST PER PRODUCT CATEGORY?
- 43. #DDDREBOOT MAKE THE IMPLICIT, EXPLICIT
- 44. #DDDREBOOT DDD VERSION #DDDREBOOT
- 45. #DDDREBOOT
- 46. #DDDREBOOT
- 47. #DDDREBOOT
- 48. #DDDREBOOT
- 49. #DDDREBOOT
- 50. #DDDREBOOT VALUE TYPE
- 51. #DDDREBOOT THE VALUE TYPE EXPRESS YOUR DOMAIN AND SWALLOW YOUR COMPLEXITY
- 52. #DDDREBOOT -VALUE TYPES- IT'S WHAT THEY ARE THAT IS IMPORTANT; NOT WHO THEY ARE
- 53. #DDDREBOOT -VALUE TYPES- Σ OF ATTRIBUTES MEANING
- 54. #DDDREBOOT -VALUE TYPES- Example
- 55. #DDDREBOOT -VALUE TYPES- A COLOR (RGB: 255-255-0) A SPEED OF 50 KM/H A BANK NOTE OF 10 € Examples
- 56. #DDDREBOOT -VALUE TYPES- IMMUTABLES BY DEFINITION RICH WITH DOMAIN LOGIC EQUALITY ON ATTRIBUTES COMPOSABLES (OPERATORS, FONCTIONS) AUTO-VALIDATING Characteristics
- 57. #DDDREBOOT -VALUE TYPES- “TRANSACTIONAL” CONSTRUCTOR OR OPERATION CONSTRAINTS ENFORCED BY THE CONSTRUCTOR, NOT BY THE OPERATIONS FAIL FAST NO SETTERS ! IMMUTABILITY, AUTO-VALIDATING Implementation
- 58. #DDDREBOOT -VALUE TYPES- Implementation RICH WITH DOMAIN LOGIC
- 59. #DDDREBOOT -VALUE TYPES- ON ALL THE ATTRIBUTES! Implementation STRONG UNICITY hashCode STRONG EQUALITY equals
- 60. #DDDREBOOT -VALUE TYPES- “SIDE-EFFECT FREE” FUNCTIONS out of the tar pit WE COMPOSE, AND PREFER RÉ-ASSIGNING INSTEAD OF CHANGING THE STATE LIKE BEFORE :-(
- 61. #DDDREBOOT ESSENTIAL COMPLEXITY ACCIDENTAL COMPLEXITY
- 62. #DDDREBOOT « VALUE OBJECT » #DDDREBOOT IN DDD, WE NAME THAT:
- 63. #DDDREBOOT « VALUE OBJECT » #DDDREBOOT IN DDD, WE NAME THAT: OXYMORON
- 64. #DDDREBOOT -VALUE TYPE- ELECTED BEST R.O.I. OF DDD LAND
- 65. #DDDREBOOT EXPRESS THE DOMAIN CODEBASE PROGRESSIVE INTRODUCTION / EXEMPLARY COMPLEXITY SWALLOWER SIMPLIFY REASONING (IMMUTABLE, THREAD-SAFE, TESTABLE) - VALUE TYPE - AN UNBEATABLE R.O.I.
- 66. #DDDREBOOT PLANT THE SEED OF THE DOMAIN INTO THE CODE THE VALUE TYPE
- 67. #DDDREBOOT MAKE THE IMPLICIT, EXPLICIT
- 68. #DDDREBOOT SHIPPING COST DECISION TABLE
- 69. #DDDREBOOT SHIPPING COST DECISION TABLE DATA LITERALS!
- 70. #DDDREBOOT AND, AS WE TALK ABOUT IMPLICIT…
- 71. #DDDREBOOT "I CAN'T LISTEN TO THAT MUCH WAGNER. I START GETTING THE URGE TO CONQUER POLAND" (WOODY ALLEN)
- 72. #DDDREBOOT “I CAN’T SEE THAT MUCH MANAGERS IN CODE. I START GETTING TO…» (JÉRÉMIE)
- 73. #DDDREBOOT SHOOT THE MANAGERS! ;-)
- 74. #DDDREBOOT MAKE THE IMPLICIT, EXPLICIT
- 75. #DDDREBOOT ANOTHER PROBLEM
- 76. #DDDREBOOT#DDDREBOOT
- 77. #DDDREBOOT LOST IN TRANSLATION #DDDREBOOT
- 78. #DDDREBOOT "IT'S DEVELOPER'S UNDERSTANDING, NOT YOUR KNOWLEDGE THAT BECOMES SOFTWARE!" Alberto BRANDOLINI (facing non collaborative BAs)
- 79. #DDDREBOOT IN SOME CASES… #DDDREBOOT
- 80. #DDDREBOOT SOLUTION?
- 81. #DDDREBOOT SOLUTION? 1 LANGUAGE : YOUR USERS’S ONE!
- 82. #DDDREBOOT « THE UBIQUITOUS LANGUAGE » #DDDREBOOT IN DDD, IT’S NAMED:
- 83. #DDDREBOOT YES BUT, HOW DO WE DO WHEN…
- 84. #DDDREBOOT A « CUSTOMER » IT'S…
- 85. #DDDREBOOT SO, HOW DO WE DO?
- 86. #DDDREBOOT CONTEXT MATTERS
- 87. #DDDREBOOT CONTEXT A GROUP OF PERSONS SHARING THE SAME MEANING BEHIND WORDS.
- 88. #DDDREBOOT Context CRM / Sales Customer => Socio- Economic group & Center of Interest
- 89. #DDDREBOOT Context Accounting Customer => Method of & Payment Period Context CRM / Sales Customer => Socio- Economic group & Center of Interest
- 90. #DDDREBOOT Context Order-Shipment Customer => addresses, availability Context Accounting Customer => Method of & Payment Period Context CRM / Sales Customer => Socio- Economic group & Center of Interest
- 91. #DDDREBOOT « BOUNDED CONTEXT » #DDDREBOOT IN DDD, WE NAME THAT:
- 92. #DDDREBOOT CRM / Sales Context Model and Language of Sales Orders / Shipment Context Model & language of Logistics Accounting Context Model and Language of Accounting
- 93. #DDDREBOOT CRM / Sales Context Model and Language of Sales Orders / Shipment Context Model & language of Logistics Accounting Context Model and Language of Accounting APP UI WEB API DATABASES APP UI APP UI APP UI DATABASES WEB API APP UI APP UI DATABASES BATCH USERS MANUAL USERS MANUAL
- 94. #DDDREBOOT
- 95. #DDDREBOOT CONTEXT PRODUCTS CATALOG CONTEXT « SEARCH » CONTEXT CLIENT & ORDERS ADS CONTEXTCONTEXT “RECOMMANDATIONS" CONTEXT « PROMOTIONS » CONTEXT « PRODUCT HIGHLIGHTING »
- 96. #DDDREBOOT LEVEL 2 IS / COMPANY APPLICATION / TEAM CODE / PAIR
- 97. #DDDREBOOT PROBLEM
- 98. #DDDREBOOT#DDDREBOOT
- 99. #DDDREBOOT#DDDREBOOT ONE THING CHANGES AND… #DDDREBOOT
- 100. #DDDREBOOT WHY SO MUCH DOMAIN TECHNICAL STUFF IN OUR CODEBASE?
- 101. #DDDREBOOT#DDDREBOOT
- 102. #DDDREBOOT SOLUTION? HEXAGONAL ARCHITECTURE
- 103. #DDDREBOOT THE WORLD DIVIDES IN 2 CATEGORIES… #DDDREBOOT
- 104. #DDDREBOOT OUTSIDE INSIDE
- 105. #DDDREBOOT DOMAIN INFRA (HTTP, Db, MoM,…)
- 106. #DDDREBOOT DOMAIN CODE DO NOT ENTER BUSINESS CODE ONLY INFRA CODE (Ports & Adapters DMZ)
- 107. #DDDREBOOT DOMAIN CODE DO NOT ENTER BUSINESS CODE ONLY INFRA CODE >> playground <<
- 108. #DDDREBOOT OUTSIDE INSIDE
- 109. #DDDREBOOT HEXAGONAL ≠LAYERS
- 110. #DDDREBOOT LAYERS ARCHITECTURE +—————————+ | PRESENTATION | +—————————+ | DOMAIN | +—————————+ | DATABASE | +—————————+
- 111. #DDDREBOOT +———————————————+ | PRESENTATION | DATABASE | … | +———————————————+ | DOMAIN | +———————————————+ HEXAGONAL ARCHITECTURE
- 112. #DDDREBOOT « Hexagonal Architecture ?!? (…) That pattern is fucking awesome! »
- 113. #DDDREBOOT ANOTHER PROBLEM
- 114. #DDDREBOOT LEGACY NAM’ #DDDREBOOT
- 115. #DDDREBOOT LEGACY NAM’ #DDDREBOOT
- 116. #DDDREBOOT LEGACY NAM’ (WAGNER’S VERSION)
- 117. #DDDREBOOT THE RECURRING QUESTION: DO WE REBUILD EVERYTHING FROM SCRATCH OR NOT?
- 118. #DDDREBOOT Legacy Application Context
- 119. #DDDREBOOT Legacy Application Context Well-crafted DDD Bubble Context
- 120. #DDDREBOOT Well-crafted DDD Bubble Context ANTI-CORRUPTION LAYER Legacy Application Context
- 121. #DDDREBOOT LEVEL 3 IS / COMPANY APPLICATION / TEAM CODE / PAIR
- 122. #DDDREBOOT THE PROBLEM
- 123. #DDDREBOOT#DDDREBOOT
- 124. #DDDREBOOT#DDDREBOOT
- 125. #DDDREBOOT#DDDREBOOT
- 126. #DDDREBOOT EVEN FOR #DDDREBOOT RELATIONS BASED ON POWER
- 127. #DDDREBOOT MAKE THE IMPLICIT, EXPLICIT
- 128. #DDDREBOOT#DDDREBOOT CONTEXT MAP EXPLICITS THE RELATIONS OF “POWER” BETWEEN TEAMS
- 129. #DDDREBOOT UPSTREAM / DOWNSTREAM « IF YOU ARE UPSTREAM AND YOU POLLUTE THE RIVER… … PEOPLE DOWNSTREAM WILL BE IMPACTED. NOT THE INVERSE. » METAPHOR OF THE RIVER FLOW
- 130. #DDDREBOOT « Search » Context Upstream downstream Products Catalog Context CONTEXT MAP
- 131. #DDDREBOOT « Search » Context U d Products Catalog Context CONTEXT MAP AN TI-CO RRU PTIO N LAYER
- 132. #DDDREBOOT UPSTREAM / DOWNSTREAM CUSTOMER - SUPPLIER CONFORMIST ANTI-CORRUPTION LAYER (ACL) SERVICE HOST SHARED KERNEL … SOME VOCABULARIES AND PATTERNS
- 133. #DDDREBOOT « CONTEXT MAP & STRATEGIC DESIGN » #DDDREBOOT IN DDD, WE NAME THAT:
- 134. #DDDREBOOT SO…
- 135. #DDDREBOOT BEFORE LEAVING
- 136. #DDDREBOOT DOMAIN DRIVEN DESIGN, IS…
- 137. #DDDREBOOT A LOT MORE ACCESSIBLE & USEFUL THAN IT MIGHT SEEMS
- 138. #DDDREBOOT STARTING MONDAY
- 139. #DDDREBOOT Ubiquitous Language Value types Entities Aggregates Repositories Factories Services Domain Events Model Driven Design Core Domain / Generic Subdomains Hexagonal Architecture* CQRS* Event Sourcing* Bubble Context Bounded Contexts Context Maps Anti-corruption Layer Event storming Customer / Supplier Distillation Shared Kernel Conformist … CODE LEVEL APP LEVEL ENTREPRISE LEVEL DDD BUILDING BLOCKS * : not DDD but friendly
- 140. #DDDREBOOT ON THE SHOULDERS OF GIANTS
- 141. #DDDREBOOT#DDDREBOOT THANK YOU ERIC !
- 142. #DDDREBOOT BUT SOMETIMES…
- 143. #DDDREBOOT#DDDREBOOT LET’S REBOOT DDD!
- 144. #DDDREBOOT#DDDREBOOT LET’S REBOOT DDD! AN OPEN COMMUNITY OF PRACTITIONERS
- 145. #DDDREBOOT#DDDREBOOT LET’S REBOOT DDD! AN OPEN COMMUNITY OF PRACTITIONERS 1. POPULARISING DDD BY BEING MORE ACCESSIBLE JARGON
- 146. #DDDREBOOT#DDDREBOOT LET’S REBOOT DDD! AN OPEN COMMUNITY OF PRACTITIONERS 1. POPULARISING DDD BY BEING MORE ACCESSIBLE JARGON 2. CONTINUE TO ENRICH THE DDD TOOLBOX
- 147. #DDDREBOOT#DDDREBOOT LET’S REBOOT DDD! 1. POPULARISING DDD BY BEING MORE ACCESSIBLE JARGON 2. CONTINUE TO ENRICH THE DDD TOOLBOX AN OPEN COMMUNITY OF PRACTITIONERS
- 148. #DDDREBOOT#DDDREBOOT LET’S REBOOT DDD! @DDDreboot + ALL TOGETHER LET’S MAKE DDD MAINSTREAM
- 149. #DDDREBOOT#DDDREBOOT LET’S REBOOT DDD! 1. POPULARISING DDD BY BEING MORE ACCESSIBLE JARGON 2. CONTINUE TO ENRICH THE DDD TOOLBOX @DDDreboot + AN OPEN COMMUNITY OF PRACTITIONERS