Domain-Driven Design (Talk)

Zuletzt auf dem DevCamp 2019

Transcript

1. Starring With
   Directed by
   In the role of
   Also Starring
   

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4. @hschwentner
   Domain-Driven Design
   

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5. @hschwentner
   #dddesign
   

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6. @hschwentner
   Was ist das
   für 1 Design?
   

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7. @hschwentner
   Vong Domain her
   

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8. -DRIVEN DESIGN
   

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10. HENN1NG
    

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11. Schw3ntn3r
    

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13. @hschwentner
    

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18. @hschwentner
    speakerdeck.com/hschwentner
    

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19. Quelle: http://www.schulbilder.org/malvorlage-informatiker-i10418.html
    

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21. @hschwentner
    16th of May, 1979
    

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22. Foto: Henning Schwentner
    

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24. Fritz&
    Franz&
    Lothar&
    Philipp.
    

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28. Foto: Steindy/Wikipedia
    

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33. Vong WPS her
    Foto: Lotse/Wikipoedia
    

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43. Wilhelm Paula Siegfried
    Foto: Lotse/Wikipoedia
    

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44. Foto: J. Rost
    

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45. »Business-Software
    die Spaß macht«
    

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47. »Business-Software
    die Spaß macht«
    

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48. View Slide

49. View Slide

50. @hschwentner
    Contents
    

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51. View Slide

52. @hschwentner
    #unabsteigbar
    

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53. “Football is a simple game;
    22 men chase a ball for
    90 minutes and at the end,
    the Germans win.”
    Gary Lineker
    

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54. @hschwentner
    Don’t repeat yourself
    Don’t repeat yourself
    Don’t repeat yourself
    

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55. View Slide

56. Domain Model
    Building Blocks Domain Event
    Aggregate
    Entity
    Value Object
    Bounded Context
    Strategic Design
    Context Mapping
    Ubiquitous Language
    Domain Expert
    Event Storming
    Tactical Design
    Domain Storytelling
    Core Domain
    

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57. Microservices
    CQRS
    Hexagonal Architecture
    Agile
    Event Sourcing
    Extreme Programming
    Scrum
    Cloud
    Self-Contained Sytems
    Verticals
    Clean Architecture
    DevOps AWS
    Azure
    

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58. History
    

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59. Blue Book
    Red Book
    2015 ’16 ’17
    ’14
    ’13
    ’12
    2010 ’11
    ’09
    ’08
    ’07
    ’06
    2005
    ’04
    ’03
    ’02
    2000 01
    ’99
    ’98
    

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60. Conways Law Blue Book
    Red Book
    2015 ’16 ’17
    ’14
    ’13
    ’12
    2010 ’11
    ’09
    ’08
    ’07
    ’06
    2005
    ’04
    ’03
    ’02
    2000 01
    1968
    ...
    ’99
    ’98
    

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65. Grafik: Robert Gloth/Wikipedia
    

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67. Foto: Serge Melki/Wikipedia
    

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68. Foto: Public Domain/Wikipedia
    

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69. View Slide

70. @hschwentner
    How is that supposed to work?
    

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73. Foto: Thorsten Bätge/Wikipedia
    

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76. Detail: Tiefenzahl
    

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77. Foto: Afrank99/Wikipedia
    

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78. Foto: Afrank99/Wikipedia
    

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79. Foto: Henning Schwentner
    

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85. LEGT
    NAUTIKER KAPITÄN
    FRAGT NACH
    7
    SCHIFFS-
    SILHOUETTE
    AUF
    PEILDIENST
    PEILSCHIFF
    TIEFE
    PEILT
    1
    SENDET
    2
    AN
    BERECHNET
    3
    ERZ
    EUGT
    4
    SENDET
    5
    PEILPLAN
    AN
    VERSCHIEBT &
    DREHT
    8
    SCHIFFS-
    SILHOUETTE
    UND
    FINDET
    9
    MELDET AN
    6
    ROUTE
    ROUTE
    PEILPLAN
    PEILPLAN
    TIEFEN-
    ZAHLEN
    ROUTE
    TIEFENLINIEN
    

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86. @hschwentner
    Is There An App For It?
    

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87. View Slide

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89. CYBER
    

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96. @hschwentner
    Software != End in itself
    

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98. ?
    

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99. View Slide

100. WICHTIG!
     

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101. View Slide

102. Software
     Domäne
     

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105. View Slide

106. Domain
     Knowledge
     

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107. Collaborative
     Modeling
     

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108. Domain
     Expert
     Developer
     

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109. Knowledge crunching
     

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111. @hschwentner
     Tools
     

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112. View Slide

113. http://www.domainstorytelling.org
     

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114. LANGUAGE
     

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115. View Slide

116. @hschwentner
     Fach-
     sprache
     Domain
     Expert
     Developer
     

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117. Ludwig WiCgenstein
     »Wovon man nicht
     sprechen kann, darüber
     muss man schweigen.«
     

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120. @hschwentner
     Technische Sprache
     

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121. @hschwentner
     Auf den
     Feature
     Branch
     pushen?
     Fahr‘ den
     Container
     hoch!
     Ich baue
     dafür ein
     Interface
     

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122. X
     Class
     Database
     Server
     Client
     O/R-Mapping
     Inheritance
     A
     B
     Method
     Interface
     Linux
     Windows
     Eclipse
     Visual Studio
     

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123. View Slide

124. @hschwentner
     Domain Language
     

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125. @hschwentner
     Fachsprache
     

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126. @hschwentner
     Container
     Containernummer
     4300
     Kran
     Twistlock
     Frachtbrief
     

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127. @hschwentner
     

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128. View Slide

129. @hschwentner
     Fachbegriff
     Fachbegriff
     

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130. @hschwentner
     Technik
     Technik
     

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131. Ubiquitous Language
     

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132. Jubikjutuss Lengwitsch
     

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133. Allgegenwärtige Sprache
     

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134. Ubiquitäre Sprache
     

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135. LEGT
     NAUTIKER KAPITÄN
     FRAGT NACH
     7
     SCHIFFS-
     SILHOUETTE
     AUF
     PEILDIENST
     PEILSCHIFF
     TIEFE
     PEILT
     1
     SENDET
     2
     AN
     BERECHNET
     3
     ERZ
     EUGT
     4
     SENDET
     5
     PEILPLAN
     AN
     VERSCHIEBT &
     DREHT
     8
     SCHIFFS-
     SILHOUETTE
     UND
     FINDET
     9
     MELDET AN
     6
     ROUTE
     ROUTE
     PEILPLAN
     PEILPLAN
     TIEFEN-
     ZAHLEN
     ROUTE
     TIEFENLINIEN
     

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136. Peilplan
     

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137. Peilplan
     

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138. Peilplan
     

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139. Peil-
     plan
     

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140. public class Peilplan
     {
     //...
     }
     

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141. @hschwentner
     Peilplan
     public class Peilplan
     {
     //...
     }
     Peilplan
     Peilplan
     

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142. “There are only two hard things in Computer Science:
     cache invalidation and naming things.”
     Phil Karlton
     

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143. “There are only two hard things in Computer Science:
     cache invalidaNon, naming things,
     and off-by-one errors.”
     Phil Karlton
     

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144. SMALL
     

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146. View Slide

147. public class Silhouette
     {
     //...
     }
     

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148. View Slide

149. public class Silhouette
     {
     public void verschiebeUm(Laenge l)
     //...
     }
     

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150. View Slide

151. public class Silhouette
     {
     public void verschiebeUm(Laenge l)
     //...
     public void dreheUm(Winkel w)
     //...
     }
     

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152. Erich Gamma
     “Program to an interface,
     not to an implementation”
     

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153. public class Silhouette
     {
     public void setPosition(Position p)
     //...
     }
     ✘
     

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154. ✘
     

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155. WARNING
     SETTERS
     CAUSE
     MODEL
     ANEMIA
     

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156. VERSCHIEBT &
     DREHT
     8
     SCHIFFS-
     SILHOUETTE
     UND
     FINDET ROUTE
     NAUTIKER
     <>
     Silhouette
     verschiebe()
     drehe()
     

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157. BIG
     

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158. ?
     

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159. ?
     

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160. ?
     

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165. @hschwentner
     “Whoever uses a canonical model
     has lost control over his life.”
     – Karl Lagerfeld
     

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166. @hschwentner
     »Wer ein kanonisches
     Domänenmodell einsetzt, hat die
     Kontrolle über sein Leben verloren«
     – Karl Lagerfeld
     

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174. Bounded Context
     

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175. View Slide

176. Bewegung
     Kosmetik
     
     Gefühle
     

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177. PUTS
     NAVIGATING
     OFFICER
     CAPTAIN
     ASKS FOR
     7
     SHIP
     SILHOUETTE
     ON
     CARTO-GRAPHER
     SOUNDING SHIP
     DEPTH
     MEASURES
     1
     SENDS
     2
     TO
     CALCULATES
     3
     DRAW
     S
     4
     SENDS
     5
     DEPTH MAP
     TO
     MOVES & TURNS
     8
     SHIP SLHOETTE
     TO FIND
     9
     DISCUSSES WITH
     6
     ROUTE
     ROUTE
     DEPTH MAP
     DEPTH MAP
     DEPTH (RAW)
     ROUTE
     CONTOUR
     LINES
     DEPTH
     MEASURE-
     MENT
     MANEUVER
     PLANNING
     MANEUVER
     PLANNING
     DEPTH
     MEASUERE-
     MENT
     

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181. @hschwentner
     Do I get a car for this?
     

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182. View Slide

183. View Slide

184. CUSTOMER
     TELLS WISH FOR
     1
     SALES-PERSON
     SIGNS
     TO
     GIVES
     FOR
     CONTRACT
     3
     RISIK MANAGER
     CONTRACT
     PASSES ON
     TO
     4
     CONTRACT
     VOTES
     CHECKS
     CALCULATES
     5
     6
     7
     CALCU-
     LATES
     TO
     8
     2
     CAR
     CREDIT
     RATING
     INSTALLMENT
     CAR
     RESALE
     VALUE
     CONTRACT
     

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185. CUSTOMER
     SIGNS
     CONTRACT
     3
     RISK MANAGER
     CONTRACT
     VOTES
     7
     <>
     LeasingContract
     sign()
     vote()
     

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186. <>
     LeasingContract
     sign()
     vote()
     

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187. <>
     LeasingContract
     sign()
     vote()
     extend()
     terminate()
     sell_to_refinance()
     

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188. @hschwentner
     The One Big Model
     

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189. View Slide

190. View Slide

191. @hschwentner
     Reality:
     Not one big model
     But several mixed models
     

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192. @hschwentner
     Reality:
     Not one big model
     But several mixed models
     

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193. BBOM
     Foto: Benutzer:Summi/Wikipedia/CC-BY-SA-3.0-migrated
     

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194. View Slide

195. CUSTOMER
     TELLS WISH FOR
     1
     SALES-PERSON
     SIGNS
     TO
     GIVES
     FOR
     CONTRACT
     3
     RISIK MANAGER
     CONTRACT
     PASSES ON
     TO
     4
     CONTRACT
     VOTES
     CHECKS
     CALCULATES
     5
     6
     7
     CALCU-
     LATES
     TO
     8
     2
     CAR
     CREDIT
     RATING
     INSTALLMENT
     CAR
     RESALE
     VALUE
     CONTRACT
     SALES
     RISK MANAGMENT
     SALES
     RISK MANAGMENT
     

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196. <>
     LeasingContract
     sign()
     vote()
     ✘
     

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197. <>
     LeasingContract
     sign()
     <>
     LeasingContract
     vote()
     

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198. <>
     LeasingContract
     sign()
     vote()
     ✘
     

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199. <>
     LeasingContract
     sign()
     <>
     LeasingContract
     vote()
     

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200. <>
     LeasingContract
     sign()
     <>
     LeasingContract
     vote()
     SALES
     RISK
     MANAGEMENT
     

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201. @hschwentner
     Ubiquitous Language
     <=>
     Bounded Context
     

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202. Ludwig Wittgenstein
     »Die Grenzen
     meiner Sprache bedeuten
     die Grenzen meiner Welt«
     

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203. TIEFEN-
     MESSUNG
     PEIL-
     SCHIFF
     TIEFEN-
     ZAHL
     MARKIER-
     UNG
     PEIL-
     PLAN
     TIEFEN-
     ZAHL
     MANÖVERPLANUNG
     

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204. TIEFENZAHL
     TIEFE AN EINEM
     BESTIMMTEN ORT
     UNTER BERÜCKSICHTIGUNG
     VON EBBE UND FLUT
     TIEFENZAHL
     PER ECHOLOT GEMESSENE
     TIEFE BEI NORMALNULL
     MANÖVER-
     PLANUNG
     TIEFENMESSUNG
     

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205. @hschwentner
     Strategic Design
     Ubiquitous Language
     Tactical Design
     

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206. View Slide

207. View Slide

208. @hschwentner
     Collaborative Modeling
     

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209. View Slide

210. View Slide

211. MANÖVER
     SIMULIERT
     ZOOM-
     STUFEN BE-
     RECHNET
     TIEFE
     GEPEILT
     TIEFE AN
     PEILDIEINST
     GEMELDET PEILPLAN
     GEDRUCKT
     TIEFEN-LINIEN
     ERSTELLT
     SILHOUETTE
     AUF
     ÖSTLICHE
     RICHTUNG
     GEDREHT
     SILHOUETTE
     300M
     BEWEGT
     SILHOUETTE
     DER LÄNGE
     100M
     ERSTELLT
     DAS AUS-
     SCHNEIDEN
     NERVT!
     HIER
     PASSAGE
     BERÜCK-
     SICHTIGEN!
     BESONDERE
     VER-FLACHUNG
     GEMELDET
     KOMMT PER
     TELEFON
     

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212. CHAOS
     

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213. http://www.domainstorytelling.org
     

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214. PUTS
     NAVIGATING
     OFFICER
     CAPTAIN
     ASKS FOR
     7
     SHIP
     SILHOUETTE
     ON
     CARTO-GRAPHER PEILSCHIFF DEPTH
     MEASURES
     1
     SENDS
     2
     TO
     CALCULATES
     3
     DRAWS
     4
     SENDS
     5
     DEPTH MAP
     TO
     MOVES & TURNS
     8
     SHIP
     SILHOUETTE
     TO FIND
     9
     DISCUSSES WITH
     6
     ROUTE
     ROUTE
     DEPTH MAP
     DEPTH MAP
     DEPTH (RAW)
     ROUTE
     CONTOUR
     LINES
     

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215. LEGT
     NAUTIKER KAPITÄN
     FRAGT NACH
     7
     SCHIFFS-
     SILHOUETTE
     AUF
     PEILDIENST PEILSCHIFF TIEFE
     PEILT
     1
     SENDET
     2
     AN
     BERECHNET
     3
     ERZEUGT
     4
     SENDET
     5
     PEILPLAN
     AN
     VERSCHIEBT &
     DREHT
     8
     SCHIFFS-
     SILHOUETTE
     UND
     FINDET
     9
     MELDET AN
     6
     ROUTE
     ROUTE
     PEILPLAN
     PEILPLAN
     TIEFEN-
     ZAHLEN
     ROUTE
     TIEFENLINIEN
     

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216. View Slide

217. => Next slide deck
     

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218. @hschwentner
     Tactical Design
     

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219. View Slide

220. Entity
     

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221. AKA: Business Object
     

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222. View Slide

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224. @hschwentner
     Identity
     

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225. View Slide

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227. Foto: Th.omas G.Graf/Wikipedia
     oto: H. Schwentner
     

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228. Grafik: Pixabay
     

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229. Foto: Bernd Schwabe in Hannover/Wikipedia
     

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230. @hschwentner
     Entity:
     *Identity
     *Lifecycle
     *(mutable state)
     

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231. View Slide

232. Versicherungspolice
     Urlaubsantrag
     Baumaßnahme
     Kaufvertrag
     Fahrauftrag
     

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233. Value Object
     

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234. Foto: Public Domain/Pixabay
     

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235. Grafik: Public Domain/Pixabay
     

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236. Foto: A. Markiewicz
     

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237. View Slide

238. View Slide

239. @hschwentner
     Value:
     *No identity
     *immutable
     

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240. Beispiel: Tiefenzahl
     

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241. Postleitzahl
     GPS-Koordinate
     IBAN
     Containernummer
     IATA-Code
     

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242. Domain Event
     

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243. Domain
     Event
     

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244. MANÖVER-
     PLANUNG
     TIEFEN-MESSUNG
     PEILPLAN
     ERSTELLT
     

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245. @hschwentner
     WAM
     

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246. View Slide

247. View Slide

248. Entwurfsmetaphern
     

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249. Foto: Dallas Museum of Art/Wikipedia
     

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250. Foto: Christoph Michels/Wikipedia
     

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251. Material
     

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252. Foto: MrX/Wikipedia
     

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253. Foto: Silsor/Wikipedia
     

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254. Werkzeug
     

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255. Foto: Wolfgagn Lonien/Wikipedia
     

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256. Automat
     

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257. @hschwentner
     Material == Entity
     

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258. @hschwentner
     Material == passiv
     

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259. Foto: Christoph Michels/Wikipedia
     

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260. Foto: MrX/Wikipedia
     

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261. @hschwentner
     == aktiv
     

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262. View Slide

263. View Slide

264. Foto: Svdmolen/Wikipedia
     

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265. View Slide

266. @hschwentner
     Strategic Design
     

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267. View Slide

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269. View Slide

270. View Slide

271. ✘
     

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272. View Slide

273. View Slide

274. View Slide

275. View Slide

276. Team Kopf
     Team Schwanz
     Team Rumpf
     Team Beine
     

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277. Team Emma
     Team Berta
     Team Erna
     Team Lisl
     

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278. TIDE-
     VORHER-
     SAGE
     MANÖVER-
     PLANUNG
     TIEFEN-
     MESSUNG
     

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279. Team Emma
     Team Berta
     Team Erna
     Team Lisl
     

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280. Team Emma
     Team Berta
     Team Erna
     Team Lisl
     

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281. View Slide

282. View Slide

283. TIDE-
     VORHER-
     SAGE
     MANÖVER-
     PLANUNG
     TIEFEN-
     MESSUNG
     

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284. View Slide

285. View Slide

286. “OrganizaNons which design systems
     are constrained to produce designs
     which are copies of the
     communicaNon structures of
     these organizaNons.”
     Melvin Conway
     

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287. “The organization of the software and
     the organization of the software team
     will be congruent.”
     Eric Raymond
     

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288. “If you have four groups working on a compiler,
     you'll get a 4-pass compiler.”
     Eric Raymond
     

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289. View Slide

290. View Slide

291. Micro-
     service A
     UI
     EnWWes
     Value
     Objects
     Services
     Micro-
     service B
     UI
     Entities
     Value
     Objects
     Services
     Micro-
     service C
     UI
     Entities
     Value
     Objects
     Services
     

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292. Micro-
     service A
     PräsentaWons-
     Schicht
     Fachdomänen-
     Schicht
     Infrastruktur-
     Schicht
     ApplikaWons-
     Schicht
     Micro-
     service B
     Direkter
     Zugriff
     Auf die DB
     Micro-
     service C
     

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293. Team Emma
     Team Berta
     Team Erna
     Team Lisl
     

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294. Team Emma
     Team Berta
     Team Erna
     Team Lisl
     

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295. Team Emma
     Team Berta
     Team Erna
     Team Lisl
     
     

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296. ✘
     

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297. View Slide

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300. Simon Brown
     

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301. Distributed
     Big Ball Of Mud
     Modulith Microservices
     Monolithic
     Big Ball Of Mud
     

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302. View Slide

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304. @hschwentner
     What now?
     

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305. @DDDger
     https://dddgermany.herokuapp.com
     

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307. @hschwentner
     LeasingNinja.io
     

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308. Workshop
     Domain-Driven Design konkret
     wps.de/ddd
     

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309. @hschwentner
     Foto: Henning Schwentner
     

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310. @hschwentner
     Consulting
     

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311. @hschwentner
     Literature
     

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312. @hschwentner
     speakerdeck.com/hschwentner
     

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313. Foto: H. Schwentner
     

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314. Foto: H. Schwentner
     

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315. Foto: Amazon
     

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318. 15$ online:
     leanpub.com/domainstorytelling
     Gratis hier am
     Stand von dpunkt
     Einführung mit allem
     was man wissen muss
     Überblick
     Rabatt!
     https://leanpub.com/domainstorytelling/c/dddkonkret
     

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326. Henning Schwentner
     @hschwentner
     hs@wps.de
     DDD
     DDD
     Slides: speakerdeck.com/hschwentner
     Book: leanpub.com/domainstorytelling
     

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