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Week 13: Chapter 30 & 31 & 32 The Database is a Detail, The Web is a Detail, The Frameworks are a Detail

The Database is a Detail

  • the data model is NOT a detail it is the STRUCTURE of our application that matters
  • the specific underlying technology the database ENGINE is a detail
  • the difference between SQL and NOSQL isn't really important when compared to whether you get the data
  • functional requirements and CAP theorm affect the technology you choose
  • the phsyical limitations of a spinning disk has an impact on how database technology evolved
  • storage isn't really important from an architectural perspective, consider that most of the time we actually transform the data after we load it

Conclusion

  • the organizational structure of data IS significant
  • the specific technology you choose is not.

The Web is a Detail

  • the GUI is a detail, the web is a GUI
  • the web is just an io device

The Frameworks are a Detail

  • frameworks are a massive commitment for a project
  • the framework however, does not make a commitment to you
  • many frameworks ask you you inherit their code and therefore violate dependency injection
  • your product may outgrow the framework
  • they often require you to do things in their way as you grow sometimes that prevents you from meeting the needs of your product
  • a better framework might come along (jquery -> angular -> react)

the solution

  • do your best to keep the framework at arms length
  • create a conversion layer between your business rules and your presentation layer (or even your controller/webhost/whatever)
  • business objects should be "plain"

exceptions

  • sometiems you DO need to depend on frameworks, as an example the "string library" of your language is pretty much a given
  • it's normal to make compromises here. Make sure the choices you make are deliberate.

Conclusion

  • keep the framework behind a bourary (the outermost layer)