DDD In Agile
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Following on from the success of last year, this annual event for London's architect community will have architectural innovation as a theme this year, and particularly CQRS. At the DDD eXchange we will feature leading thinkers and architects who will share their experience and Eric Evans is the programme lead.
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DDD In Agile
- 1. Folding Together DDD and Agile Quick and Sustainable Development of Complex Software Eric Evans domainlanguage.com
- 2. DDD is a Set of Driving Principles Focus on the Core Domain. Explore models in a creative collaboration of domain practitioners and software practitioners. Speak a Ubiquitous Language within an explicitly Bounded Context.
- 3. ‘We should do a nice design, but we just don’t have time.’
- 4. Religion ‘We should do a nice design, but we just don’t have time.’
- 5. ‘Modeling and design take extra time, but they pay off in the long run.’
- 6. Speculation ‘Modeling and design take extra time, but they pay off in the long run.’
- 7. Modeling and design are often the quickest path to the actual goal.
- 8. What is your goal? Implement this user story? Complete a releasable set of stories with an acceptable level of bugs? Deliver a release that the team can continue to extend in the next release? Deliver a clear and cohesive user experience?
- 9. Defining Our Terms domain A sphere of knowledge or activity. model A system of abstractions representing selected aspects of the domain. A model is a distilled form of domain knowledge, assumptions, rules and choices.
- 10. Non Sequitur ‘We have to get the model right first, before we write the code.’
- 13. What does DDD look like?
- 15. DDD can be undramatic. Walking through concrete reference scenarios Creative collaboration with domain practitioner Refinement of the ubiquitous language and therefore the model
- 16. What is a ‘special case’?
- 17. Green Bar!
- 19. Shift from Push to Pull When communications with stakeholders deteriorates. When solutions seem more complex than the problems. When velocity slows (completed work becomes a burden).
- 20. Ok. Time to pull!Now what do we actually do?
- 22. Whitepaper First Draft domainlanguage.com/processdraft Will announce second draft soon in newsletter.
- 23. Where To Fit It Stand Up Meetings Spike Iteration Zero Release Planning
- 24. Defining Our Terms bounded contextA description of a boundary (typically a subsystem, or the work of a particular team) within which a particular model is defined and applicable.
- 25. Bounded Context Modeling and design pay off within a clean, unified, bounded context. Shared code ownership within a context. One unified context is owned by one team.
- 26. Not all of a large system will be well designed.
- 27. Focus An area of the system is recognized as a center of frequent change. An area of development is strategically important. The user experience is losing coherence.
- 28. Focus Triage the Ball of Mud Accept the Tidy Transaction Scripts Leave well enough alone
- 29. DDD Tools for Agile Practitioners Model Exploration ‘Whirlpool’ Process (Section 3 in DDD book) Context Boundaries (see Chapter 14 in DDD) Distilling the Core (see Chapter 15 in DDD) Triggers to ‘pull’ modeling when needed
Notes de l'éditeur
- That is a pretty dense statement. Over the next few hours, we’ll try to define enough terms and explain enough of what we concretely do in order to unpack this statement.