7 Years of Domain-Driven Design (DDD Foundations)

Transcript

1. vladikk doit-intl.com
   #DDDEU
   7 YEARS OF DDD
   or
   Tackling Complexity in
   Large Scale Marketing Systems
   

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2. vladikk doit-intl.com
   #DDDEU
   YAY!!!
   

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3. vladikk doit-intl.com
   #DDDEU
   

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4. vladikk doit-intl.com
   #DDDEU
   Your Product Marketing
   Strategy
   Creatives Campaigns Sales
   Agents
   Optimization
   Profits
   

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5. vladikk doit-intl.com
   #DDDEU
   THE FIRST
   BOUNDED CONTEXT
   01
   

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6. vladikk doit-intl.com
   #DDDEU
   
   

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7. vladikk doit-intl.com
   #DDDEU
   

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8. Very nice!!!1
   

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9. vladikk doit-intl.com
   #DDDEU
   Aggregates everywhere!!!
   

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10. vladikk doit-intl.com
    #DDDEU
    Aggregates everywhere!!!
    Creative
    Agency
    Advertiser
    Publisher
    Website
    Placement
    Ad Zone
    Ad Type
    Target Market
    Group
    Zone Type
    Funnel
    Contract
    Budget Unit
    Campaign
    

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11. vladikk doit-intl.com
    #DDDEU
    The Bounded Context
    Creative
    Agency
    Advertiser
    Publisher
    Website
    Placement
    Ad Zone
    Ad Type
    Target Market
    Group
    Zone Type
    Funnel
    Contract
    Budget Unit
    Audience
    

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12. vladikk doit-intl.com
    #DDDEU
    Domain Model
    Service / Application Layer
    Presentation
    Infrastructure
    Anemic!
    Behaviour
    

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13. vladikk doit-intl.com
    #DDDEU
    Imperfect architecture
    “QA is for cowards”
    BUT IT WORKED!
    

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14. vladikk doit-intl.com
    #DDDEU
    UBIQUITOUS LANGUAGE
    

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15. vladikk doit-intl.com
    #DDDEU
    Domain Experts
    Software Developers
    No experience in online marketing
    Nice people!
    

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16. vladikk doit-intl.com
    #DDDEU
    Smooth communication
    Strong grasp of the business domain
    Working software
    Aggressive time to market
    

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17. vladikk doit-intl.com
    #DDDEU
    Ubiquitous Language
    Anemic Domain Model
    

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18. vladikk doit-intl.com
    #DDDEU
    Leads Sales Agents
    Ads
    

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19. vladikk doit-intl.com
    #DDDEU
    Leads CRM Categorize Desk
    Desk
    Desk
    Sales Agents
    Sales Agents
    Sales Agents
    Clients’ Systems
    

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20. vladikk doit-intl.com
    #DDDEU
    

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21. vladikk doit-intl.com
    #DDDEU
    THE CRM
    BOUNDED CONTEXT
    02
    

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22. vladikk doit-intl.com
    #DDDEU
    Ubiquitous Language
    Anemic Domain Model
    

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23. vladikk doit-intl.com
    #DDDEU
    Creative
    Agency
    Publisher
    Website
    Advertiser
    Ad Zone
    Ad Type
    Target Market
    Group
    Zone Type
    Funnel
    Contract
    Budget Unit
    Audience
    Group
    Desk
    Qualification
    Assessment
    Organization Unit
    Assignment
    Rank
    Message
    On-site Activity
    Placement Visit Brand
    Marketing Lead
    CRM Lead
    Marketing Campaign CRM Campaign
    

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24. vladikk doit-intl.com
    #DDDEU
    Domain Experts
    Software Developers
    …. Lead ….
    …. Campaign…
    

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25. vladikk doit-intl.com
    #DDDEU
    

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26. vladikk doit-intl.com
    #DDDEU
    

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27. vladikk doit-intl.com
    #DDDEU
    BOUNDED CONTEXTS
    PROTECT THE LANGUAGE
    AGGREGATES PROTECT
    CONSISTENCY OF DATA
    

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28. vladikk doit-intl.com
    #DDDEU
    Creative
    Agency
    Publisher
    Website
    Advertiser
    Ad Zone
    Ad Type
    Target Market
    Group
    Zone Type
    Funnel
    Contract
    Budget Unit
    Audience
    Group
    Desk
    Qualification
    Assessment
    Organization Unit
    Assignment
    Rank
    Message
    On-site Activity
    Placement Visit Brand
    Marketing Lead
    CRM Lead
    Marketing Campaign CRM Campaign
    

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29. vladikk doit-intl.com
    #DDDEU
    Creative
    Agency
    Publisher
    Website
    Advertiser
    Ad Zone
    Ad Type
    Target Market
    Group
    Zone Type
    Funnel
    Contract
    Budget Unit
    Audience
    Placement Visit
    Lead
    Campaign
    Marketing
    Group
    Desk
    Qualification
    Assessment
    Organization Unit
    Assignment
    Rank
    Message
    On-site Activity
    Brand
    Lead
    Campaign
    CRM
    

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30. vladikk doit-intl.com
    #DDDEU
    Aggregates will:
    • Protect transactional boundaries

    • Encompass business logic and invariants
    Domain
    Service / Application Layer
    Presentation
    Infrastructure
    

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31. vladikk doit-intl.com
    #DDDEU
    Aggregates will:
    • Protect transactional boundaries

    • Encompass business logic and invariants
    Domain
    Service / Application Layer
    Presentation
    Infrastructure
    Domain
    Service / Application Layer
    

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32. vladikk doit-intl.com
    #DDDEU
    

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33. vladikk doit-intl.com
    #DDDEU
    

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34. vladikk doit-intl.com
    #DDDEU
    

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35. vladikk doit-intl.com
    #DDDEU
    Stored
    procedures???
    

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36. vladikk doit-intl.com
    #DDDEU
    Group
    Desk
    Qualification
    Assessment
    Organization Unit
    Assignment
    Rank
    Message
    On-site Activity
    Brand
    Lead
    Campaign
    Lead
    

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37. vladikk doit-intl.com
    #DDDEU
    L e a d
    CRM Team DBA Team
    

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38. vladikk doit-intl.com
    #DDDEU
    

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39. vladikk doit-intl.com
    #DDDEU
    Inconsistent models
    No shared understanding
    Duplication of knowledge
    Went out of sync quickly
    NIGHTMARE
    

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40. vladikk doit-intl.com
    #DDDEU
    Wasn’t delivered on time
    

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41. vladikk doit-intl.com
    #DDDEU
    Wasn’t delivered on time
    Production issues
    

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42. vladikk doit-intl.com
    #DDDEU
    Wasn’t delivered on time
    Production issues
    Data corruption
    

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43. vladikk doit-intl.com
    #DDDEU
    Wasn’t delivered on time
    Production issues
    Data corruption
    Thrown away and reimplemented
    

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44. vladikk doit-intl.com
    #DDDEU
    Ubiquitous Language
    Domain Model
    Bounded Contexts
    Protect w/ Implement as
    

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45. vladikk doit-intl.com
    #DDDEU
    Ubiquitous Language
    Domain Model
    Bounded Contexts
    Protect w/ Implement as
    …Dude, where are Sub-Domains?
    

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46. Not all of a large system will be well designed
    “
    Eric Evans
    

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47. vladikk doit-intl.com
    #DDDEU
    THE CRUNCHERS
    BOUNDED CONTEXT
    03
    

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48. vladikk doit-intl.com
    #DDDEU
    Marketing CRM Analysis
    Customer
    Events
    Marketing CRM
    

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49. vladikk doit-intl.com
    #DDDEU
    Marketing
    CRM
    Analysis
    Customer
    Events
    Event
    Crunchers
    

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50. vladikk doit-intl.com
    #DDDEU
    Competitive advantage? - No
    Off-the-shelve solution? - No
    => Supporting sub-domain
    

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51. vladikk doit-intl.com
    #DDDEU
    Layered Architecture
    Transaction Script
    Worked
    …. for a while
    

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52. vladikk doit-intl.com
    #DDDEU
    Customer
    Events
    Event
    Crunchers
    Marketing
    CRM
    Analysis
    Flag Flag
    Calculated fields
    

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53. vladikk doit-intl.com
    #DDDEU
    Marketing
    CRM
    Analysis
    Customer
    Events
    Event
    Crunchers
    

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54. vladikk doit-intl.com
    #DDDEU
    Customer
    Events
    Event Crunchers
    (BBOM)
    CRM
    Marketing
    Analysis
    

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55. vladikk doit-intl.com
    #DDDEU
    Customer
    Events
    Event
    Crunchers
    (Event Sourced)
    CRM
    Marketing
    Analysis
    

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56. vladikk doit-intl.com
    #DDDEU
    THE BONUSES
    BOUNDED CONTEXT
    04
    

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57. vladikk doit-intl.com
    #DDDEU
    Sales Commissions Reports
    

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58. vladikk doit-intl.com
    #DDDEU
    Competitive advantage? - No
    Off-the-shelve solution? - No
    => Supporting sub-domain
    

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59. vladikk doit-intl.com
    #DDDEU
    Active Record
    Service / Application Layer
    Presentation
    Infrastructure
    

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60. vladikk doit-intl.com
    #DDDEU
    Sales Commissions Reports
    Let’s try different percentages
    What if the percentage could be a function of
    a price?
    No, what if the percentage is a function of
    number of sales?
    No, no, the percentage will be a function
    both of number of sales and sale amount
    And another upgrade if there are more than Y
    sales per week!
    But we will upgrade the percentage if there
    are more than X sales per month!
    

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61. vladikk doit-intl.com
    #DDDEU
    Event Sourced Domain Model
    Service / Application Layer
    Presentation
    Infrastructure
    BIG BALL OF MUD
    

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62. vladikk doit-intl.com
    #DDDEU
    Active Record
    Service / Application Layer
    Presentation
    Infrastructure
    Transaction Script
    Service / Application Layer
    Presentation
    Infrastructure
    Event Crunchers Bonuses
    Ubiquitous Language
    

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63. vladikk doit-intl.com
    #DDDEU
    Event Sourced Domain Model
    Service / Application Layer
    Presentation
    Infrastructure
    Event Sourced Domain Model
    Service / Application Layer
    Presentation
    Infrastructure
    Event Crunchers Bonuses
    Ubiquitous Language
    

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64. vladikk doit-intl.com
    #DDDEU
    Ubiquitous Language
    Core
    Bounded Contexts
    Protect by

    decomposing to
    Identify
    Domains
    Domain Model
    Supporting
    Generic
    AR / TS
    Adopt
    Implement as
    

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65. vladikk doit-intl.com
    #DDDEU
    WHAT
    WE HAVE
    L E A R N E D
    

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66. vladikk doit-intl.com
    #DDDEU
    UBIQUITOUS
    LANGUAGE
    01
    

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67. vladikk doit-intl.com
    #DDDEU
    UBIQUITOUS LANGUAGE
    THE CORE DOMAIN OF DOMAIN-DRIVEN DESIGN
    

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68. vladikk doit-intl.com
    #DDDEU
    Marketing
    Ubiquitous Language
    Business goals achieved
    CRM
    Ubiquitous Language
    Production issues
    Long and painful refactoring
    Event Crunchers
    Ubiquitous Language
    Big ball of mud
    Bonuses
    Ubiquitous Language
    Refactored in time
    

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69. vladikk doit-intl.com
    #DDDEU
    DOMAIN
    TYPES
    02
    

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70. vladikk doit-intl.com
    #DDDEU
    Core
    Supporting
    Generic
    

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71. vladikk doit-intl.com
    #DDDEU
    Generic Domain Adopt / Buy
    Supporting Domain Active Record / Transaction Script
    Core Domain Domain Model / Event Sourcing
    

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72. vladikk doit-intl.com
    #DDDEU
    COMPANIES CHANGE, EVOLVE, REINVENT THEMSELVES
    DOMAINS' TYPES CHANGE ACCORDINGLY
    

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73. vladikk doit-intl.com
    #DDDEU
    SUPPORTING ➤ CORE
    • Event Crunchers
    • Bonuses
    

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74. vladikk doit-intl.com
    #DDDEU
    Generic Domain Adopt / Buy
    Supporting Domain Active Record / Transaction Script
    Core Domain Domain Model / Event Sourcing
    

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75. vladikk doit-intl.com
    #DDDEU
    Generic Domain
    Adopt / Buy
    Supporting Domain
    Active Record / Transaction Script
    Core Domain
    Domain Model / Event Sourcing
    

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76. vladikk doit-intl.com
    #DDDEU
    Less waste
    Dialog with the business
    IMPLEMENTATION DESIGN ➤ DOMAIN TYPE
    

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77. vladikk doit-intl.com
    #DDDEU
    • Questionable competitive edge?
    • Unexpected competitive edge?
    BUSINESS COMPLEXITY ≠ DOMAIN TYPE?
    

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78. vladikk doit-intl.com
    #DDDEU
    SUMMARY
    

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79. vladikk doit-intl.com
    #DDDEU
    Creative
    Agency
    Advertiser
    Publisher
    Website
    Placement
    Ad Zone
    Ad Type
    Target Market
    Group
    Zone Type
    Funnel
    Contract
    Budget Unit
    Campaign
    Aggregates everywhere!!!
    

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80. vladikk doit-intl.com
    #DDDEU
    Ubiquitous Language
    Bounded Contexts
    Protect by

    decomposing to
    Design

    Implementation
    Core
    Supporting
    Generic
    Domain Model
    AR / TS
    Adopt
    Confirm w/

    Business
    Ubiquitous Language Everywhere!!!
    

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81. https://bit.ly/2ptJ5fS
    THANK
    YOU!
    @vladikk
    vladikk.com
    https://bit.ly/31nSD9c
    http://careers.doit-intl.com
    

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