More than you wanted to know about Service Objects

Transcript

1. More than you
   wanted to know
   about Service
   Objects
   Zero One × RUBYFUZA & FRIENDS
   

   View Slide

2. 4 Things About Me
   Coding In The Bad Old Days
   Meet Service Objects
   Service Object Nirvana
   What's In It For Me?
   Hey Kid, Wanna Build One?
   Tips & Tricks
   Questions & Closing
   I.
   II.
   III.
   IV.
   V.
   VI.
   VII.
   VIII.
   00
   Todays
   Agenda
   More than you wanted to know about Service objects
   Zero One × RUBYFUZA & FRIENDS
   

   View Slide

3. 01
   More than you wanted to know about Service objects
   4 Things About Me
   My Family My Dogs My Company
   Zero One × RUBYFUZA & FRIENDS
   

   View Slide

4. 01
   Too much
   Destiny
   More than you wanted to know about Service objects
   Hit me up on gee-forr on
   PSN.
   Let's raid.
   Zero One × RUBYFUZA & FRIENDS
   

   View Slide

5. A
   story about
   the bad old
   days
   More than you wanted to know about Service objects
   Zero One × RUBYFUZA & FRIENDS
   

   View Slide

6. V
   Logic in
   your
   views
   More than you wanted to know about Service objects
   Zero One × RUBYFUZA & FRIENDS
   

   View Slide

7. C
   What about
   controllers?
   More than you wanted to know about Service objects
   Zero One × RUBYFUZA & FRIENDS
   

   View Slide

8. M
   Models are
   the perfect
   place for
   my logic
   More than you wanted to know about Service objects
   Zero One × RUBYFUZA & FRIENDS
   

   View Slide

9. Mixed concerns
   Single use context
   Hard to refactor
   Difficult to extend
   Painful to test
   More than you wanted to know about Service objects
   ⇣
   The
   downside
   Zero One × RUBYFUZA & FRIENDS
   

   View Slide

10. Developer, meet Service Object.
    Service Object, meet developer.
    More than you wanted to know about Service objects
    Zero One × RUBYFUZA & FRIENDS
    

    View Slide

11. A Service Object is a Plain old Ruby
    Object, that is meant to decompose
    business logic into manageable
    classes and methods.
    Rob Race,
    Hackernoon (http://bit.ly/serv-objs-1)
    “
    ”
    Zero One × RUBYFUZA & FRIENDS
    

    View Slide

12. 03
    More than you wanted to know about Service objects
    What makes a Service Object great?
    7
    Preferably via single
    public method
    It Does One Thing
    8
    Simple Services can
    compose together to
    implement complex
    processes
    They Can Chain Together
    F
    Gives you more than
    a simple boolean
    return value
    Complex Return Objects
    Zero One × RUBYFUZA & FRIENDS
    

    View Slide

13. organisers
    03
    Let's get
    meta
    More than you wanted to know about Service objects
    Two types typically
    found in the wild:
    actions &
    Zero One × RUBYFUZA & FRIENDS
    

    View Slide

14. What changed for me
    when I started using
    Service Objects in my code?
    More than you wanted to know about Service objects
    Zero One × RUBYFUZA & FRIENDS
    

    View Slide

15. 04
    What
    Changed?
    More than you wanted to know about Service objects
    Give some input
    Test some output
    Stub friendly
    Tests became easier
    
    
    
    
    Change friendly architecture
    Limited blast radius for changes
    Logic can be swapped out easily
    Logic can be dropped easily
    Changes to reqs are simpler
    
    
    
    
    
    Zero One × RUBYFUZA & FRIENDS
    

    View Slide

16. 04
    What
    Changed?
    More than you wanted to know about Service objects
    Logic reuse
    Reuse across situations
    Reuse became a reality
    
    
    
    Objectively simpler code
    Most code fits in a screen
    More devs can contribute
    Less complexity → more quality
    Lower overall code complexity
    L
    
    
    
    
    Zero One × RUBYFUZA & FRIENDS
    

    View Slide

17. 05
    What can I
    expect if I use
    Service Objects?
    Zero One × RUBYFUZA & FRIENDS
    More than you wanted to know about Service objects
    

    View Slide

18. 05
    What is
    this?
    More than you wanted to know about Service objects
    What does
    it do?
    Zero One × RUBYFUZA & FRIENDS
    

    View Slide

19. 05
    How about
    now?
    More than you wanted to know about Service objects
    Zero One × RUBYFUZA & FRIENDS
    What does
    it do?
    

    View Slide

20. 05
    Great if
    you're
    DHH
    More than you wanted to know about Service objects
    Not so
    great
    for the
    rest of us.
    Zero One × RUBYFUZA & FRIENDS
    

    View Slide

21. 05
    Any clearer
    now?
    More than you wanted to know about Service objects
    Zero One × RUBYFUZA & FRIENDS
    

    View Slide

22. 05
    Let's take a
    closer look
    More than you wanted to know about Service objects
    Zero One × RUBYFUZA & FRIENDS
    

    View Slide

23. IssuesJWT
    IssuesCookie
    FetchExistingUserForOpenIDPayload
    CreateUserForOpenIDPayload
    More than you wanted to know about Service objects
    05
    Simpler
    feature
    refactoring
    LogUserIn
    Zero One × RUBYFUZA & FRIENDS
    

    View Slide

24. UpdateWhileYouWereGoneNotifications
    SendWelcomeBackEmail
    IssuesJWT
    FetchExistingUserForOpenIDPayload
    CreateUserForOpenIDPayload
    More than you wanted to know about Service objects
    05
    Modular
    logic at the
    process layer
    LogUserIn
    Zero One × RUBYFUZA & FRIENDS
    

    View Slide

25. Actions have easily
    stubbable or mockable
    inputs, and easily
    testable outputs
    Organisers take code on a
    journey, traversing through the
    whole stack. They implement a
    process end to end.
    Treat like unit tests
    Actions
    Treat like integration tests
    Organisers
    Zero One × RUBYFUZA & FRIENDS
    

    View Slide

26. Web Controllers
    Async jobs
    Rake tasks
    05
    Use outside
    of just web
    requests
    More than you wanted to know about Service objects
    Your application is
    more than just a
    series of HTTP
    transactions
    Zero One × RUBYFUZA & FRIENDS
    

    View Slide

27. Controllers become super boring.
    0 resist the temptation to send
    params as primary argument
    Zero One × RUBYFUZA & FRIENDS
    

    View Slide

28. 06
    Let's build one
    More than you wanted to know about Service objects
    Zero One × RUBYFUZA & FRIENDS
    

    View Slide

29. Tip, Tricks, etc
    07
    More than you wanted to know about Service objects
    Zero One × RUBYFUZA & FRIENDS
    

    View Slide

30. 07
    Name after steps in business process.
    Avoid naming after implementation details.
    InviteFriend is better than CreateLinkedUser
    Actions
    P
    Naming
    More than you wanted to know about Service objects
    Name after business processes
    Organisers
    f
    Zero One × RUBYFUZA & FRIENDS
    

    View Slide

31. Not traditional. Publish/
    Subscribe Framework
    Wisper
    Plenty of features, like rollbacks.
    Responsive developer.
    Light-Service
    Can be very powerful.
    D.R.Y? more like D.I.Y, amirite?
    Dry-rb
    Battle-tested. Simple. Core
    features supported. Has
    plugins. Recommended.
    Interactor
    07
    More than you wanted to know about Service objects
    Picking a Service Object Framework
    01 02
    03 04
    Zero One × RUBYFUZA & FRIENDS
    

    View Slide

32. 07
    More than you wanted to know about Service objects
    Programatically generate action sequences
    Zero One × RUBYFUZA & FRIENDS
    

    View Slide

33. More than you wanted to know about Service objects
    Sidekiq Workers
    Service Objects W
    Hybrid Service Object × Async Worker
    Zero One × RUBYFUZA & FRIENDS
    

    View Slide

34. 08
    Thank you!
    More than you wanted to know about Service objects
    Gabriel Fortuna / [email protected] / @gee_forr
    Zero One / zero-one.io / @we_are_zero_one
    Kill some mediocrity with us - We're hiring.
    Zero One × RUBYFUZA & FRIENDS
    Seriously, let's play some Destiny, PSN: gee-forr
    

    View Slide