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Domain Driven Design & NoSQL

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Avatar for Lucas Dohmen Lucas Dohmen
March 22, 2014
Programming
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Domain Driven Design & NoSQL

I gave this presentation at the excellent RubyConf India.

Avatar for Lucas Dohmen

Lucas Dohmen

March 22, 2014

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Transcript

  1. Escaping the Tower of Babel Domain Driven Design & NoSQL

  2. class SpaceShuttle end ! class Astronaut end v I

  3. Domain Driven Design • Find an ubiquitous language • The

    language is based on the domain • Every person involved understands the language Eric Evans

  4. Iterative Development Close relationship between devs & domain experts Domain

    Driven Design

  5. Hi. I’m Lucas.

  6. I work for ArangoDB GmbH

  7. We build ArangoDB

  8. ArangoDB is an Open Source NoSQL Database

  9. But what is NoSQL?

  10. SQL NoSQL

  11. SQL Not only SQL

  12. What is NoSQL? What is SQL? What is a relational

    algebra? What is a relation? Not SQL A relational algebra An algebra on relations

  13. {(Alice, 1983-07-1, 1) (Bob, 2014-03-19, 2)}

  14. name birthday city Alice 1983-07-1 1 Bob 2014-03-19 2

  15. Disconnect I v Ownership name: alice… type: spaceshuttle

  16. Entity Value Object Service Identified by ID Value What it

    does State Mutable Immutable Stateless

  17. + Factories + Repositories + Aggregates

  18. DENORMALIZATION

  19. Lift the restriction • Tuples containing other Tuples • Tuples

    with arbitrary attributes

  20. Space Shuttle Parts

  21. Space Shuttle Parts Document Store

  22. I type: spaceshuttle v name: alice astronaut: 1 spaceshuttle: 3

  23. JOINS

  24. Alice Ownership SpaceShuttle

  25. Alice Ownership SpaceShuttle Graph Database

  26. Alice Ownership SpaceShuttle Parts

  27. Alice Ownership SpaceShuttle Parts I’m a document!

  28. Alice Ownership SpaceShuttle Parts Me too!

  29. Alice Ownership SpaceShuttle Parts

  30. Alice Ownership SpaceShuttle Parts Multi Model Database

  31. Disconnect I v Ownership name: alice… type: spaceshuttle

  32. I type: spaceshuttle v name: alice Ownership since: 2003

  33. Explain graphs. Learn about the domain. Find the common language.

    Build one model for everyone involved. Evolve the model alongside the implementation moonglum moonbeamlabs arangodb.org