Hands-on: Introduction to Domain Storytelling

Hands-on presented at O'Reilly Software Architecture Conference Berlin

1. Brought to you by Dorota and Stefan (@hofstef) who work for WPS – Workplace Solutions GmbH in Hamburg and Berlin.
2. @hofstef @wps_de business gibberish { nerd; speek; } Domain Expert Software Expert
3. @hofstef @wps_de Fach- sprache Domain Expert Software Expert
4. @hofstef @wps_de Thanks to DDD Europe for this awesome picture of Henning!
5. Why Domain Storytelling? Today: • Understanding a domain • Reasoning about sub-domains and bounded contexts There is more: • Deriving domain model • Deriving requirements • Designing new processes • Facilitate change • …
6. @hofstef @wps_de Schedule 1. Understanding a domain demo – explanation – exercise – break 2. Domain-Driven Design & finding boundaries demo – explanation – exercise – break 3. Practice 4. Your domain or a real world example
7. @hofstef @wps_de Demo: Leasing a Car
8. @hofstef @wps_de
9. @hofstef @wps_de @hofstef @hschwentner Pictographic Language
10. @hofstef @wps_de actor work object activity annotation
11. @hofstef @wps_de Risk manager contract votes
12. @hofstef @wps_de person people system
13. @hofstef @wps_de …sends the contract to... ...passes on the contract to... sends contract passes on to to contract
14. @hofstef @wps_de The sales person passes on the contract to the risk manager. passes on contract Risk manager Sales person to
15. @hofstef @wps_de 1 1 1
16. @hofstef @wps_de tells whish for Sales person Customer 1 monthly installment contract car to in 2
17. @hofstef @wps_de tells whish for Sales person Customer 1 monthly installment contract car to in 2 contract 3
18. @hofstef @wps_de CONCRETE STORIES VS. ABSTRACT PROCESSES
19. @hofstef @wps_de 3 good examples are better than 1 bad abstraction
20. @hofstef @wps_de Draw here Leave some empty space there → Annotations, variations, and purpose Preconditions, assumptions, and triggers
21. @hofstef @wps_de Workshops
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26. @hofstef @wps_de Whiteboard Kit Picture: W. Kinkeldei @wkinkeldei
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28. @hofstef @wps_de PowerPoint, yEd, Viso, gliphy… asks for Reservation (movie, time, seats) cashier customer 1 Screen plan finds available seats in CineSoft 2 seats recommends 3
29. @hofstef @wps_de github.com/WPS/domain-story-modeler
30. @hofstef @wps_de
31. @hofstef @wps_de eBook and free sample available at: https://leanpub.com/domainstorytelling Get a discount using the link: http://leanpub.com/domainstorytelling/c/saconf
32. @hofstef @wps_de If you speak German: Take a free bruchure! And grab a sticker:
33. @hofstef @wps_de Twitter: @hofstef @hschwentner #DomainStorytelling Slides: https://speakerdeck.com/hofstef Book: https://leanpub.com/domainstorytelling Slack: ddd-cqrs-es.slack.com Invite yourself: http://j.mp/ddd-es-cqrs Slack Channel: #domain-storytelling http://domainstorytelling.org The pictures used in this talk are public domain, unless noted otherwise. Screenshots and examples © WPS - Workplace Solutions GmbH
34. @hofstef @wps_de A Quick Introduction to Domain-Driven Design
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37. @hofstef @wps_de Domain Knowledge
38. @hofstef @wps_de Blue Book Red Book 2015 ’16 ’17 ’14 ’13 ’12 2010 ’11 ’09 ’08 ’07 ’06 2005 ’04 ’03 ’02 2000 01 ’99 ’98
39. Strategic Design Ubiquitous Language Tactical Design Eric Evans, 2003 Picture: Martin Schimak @martinschimak Paul Rayner, DDD Explore 2018 + Ubiquitous Language as an overarching principle DDD 2003 vs. DDD 2018
40. @hofstef @wps_de Demo: Leasing a Car
41. @hofstef @wps_de
42. One Domain – Multiple Models Foto: Maiconfz/pixabay/CCO Foto: Globus from book shelf/wikipedia/ CC-BY-3.0 Foto:Clker-Free-Vector-Images/pixabay/ CCO Foto: Wasserseemüller-Globus/Wikipedia/CC-PD-Mark
43. @hofstef @wps_de Bounded Context: A coherent model with an unambiguous language.
44. @hofstef @wps_de general ledger accounting Sales Payroll accounting HR Subdomain Bounded Context
45. Sub-domain vs. Bounded Context • Ideally, there is a 1:1 relation between sub-domain and bounded context (at least for your core sub-domains). • In real life, there is a trade-off between • Business process/domain • Organizational structure • Business value • Technical constraints • User experience • … • Legacy systems are often unbounded Foto: Dreibund Medaille/Wikipedia/CC BY-SA 3.0
46. @hofstef @wps_de Heuristic: Look for activities that - from an actor’s perspective - belong together.
47. @hofstef @wps_de Activities that belong together:
48. @hofstef @wps_de Indicator: only one actor involved xyz context
49. @hofstef @wps_de Indicator: one-way information flow abc context xyz context
50. @hofstef @wps_de Indicator: different triggers abc context xyz context
51. @hofstef @wps_de Navigating Officer Captain route puts 1 2 ship shilhouette depth map on Cartographer MANEUVER PLANNING (BIG PICTURE)
52. @hofstef @wps_de Navigating Officer Captain route puts 1 2 ship shilhouette depth map on Cartographer MANEUVER PLANNING (BIG PICTURE)
53. @hofstef @wps_de Navigating Officer Captain route puts ship shilhouette depth map on Cartographer Sounding Ship depth measures 1 depth (raw) sends 2 to contours, minimum depths 3 depth map 4 sends 5 depth map MANEUVER PLANNING (BIG PICTURE) (1-5) daily
54. @hofstef @wps_de puts Navigating Officer Captain route 7 ship shilhouette depth map on Cartographer Sounding Ship depth measures 1 depth (raw) sends 2 to contours, minimum depths 3 depth map 4 sends 5 depth map 8 ship shilhouette to find route route 9 discusses with 6 MANEUVER PLANNING (BIG PICTURE) (1-5) daily (7) fitting shilhoutte available
55. @hofstef @wps_de puts Navigating Officer Captain route 7 ship shilhouette depth map on Cartographer Sounding Ship depth measures 1 depth (raw) sends 2 to contours, minimum depths 3 depth map 4 sends 5 depth map 8 ship shilhouette to find route route 9 discusses with 6 MANEUVER PLANNING (BIG PICTURE) (1-5) daily (7) fitting shilhoutte available maneuver planning (sub-domain)
56. @hofstef @wps_de puts Navigating Officer Captain route 7 ship shilhouette depth map on Cartographer Sounding Ship depth measures 1 depth (raw) sends 2 to contours, minimum depths 3 depth map 4 sends 5 depth map 8 ship shilhouette to find route route 9 discusses with 6 MANEUVER PLANNING (BIG PICTURE) (1-5) daily (7) fitting shilhoutte available ?