DDD Basics: Bounded Contexts, Modelling

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DDD Basics February 11, 2014 - Olen, Belgium wiﬁ: ITR-Events / domaindriven

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Kindly hosted by

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Community Talks Call for Proposals domaindriven.be/cfp

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Defining DDD (Yves) Ubiquitous Language (Jef) Bounded Contexts (Mathias) Context Mapping (Stijn) Modelling (Mathias) Starting/Selling DDD (Tom) Q&A / Lean Coffee

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Bounded Contexts

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Large complex systems: increased cognitive load

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Large complex systems: divergence in mental model

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Large complex systems: subtle nuances in meaning

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Avoid a big unified centralised model.

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Split into Bounded Contexts

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Benefits: clarity model integrity freedom to evolve separately

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Inspired by departments teams life cycles business processes …

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Make Bounded Context explicit pure independent consistent within its boundary

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Modelling

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Structural modelling Ontological

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Structural modelling inspired by persistence concerns

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Relational Normalised CRUD Anaemic

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Ask your Domain Expert about State Changes!

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Why does it change? When does it change? How often? Who causes it? By which rules? What consequences?

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! ! The moving parts are more interesting than the stable parts

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! ! A Domain Model is about:

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state + structure behaviour + change temporal roles + actors business rules + invariants causality + correlation interaction processes workflows + transitions intention + consequence failure …