Structural Engineering in Ruby

Morning keynote at Birmingham on Rails in Birmingham, AL in January 31, 2020

https://birminghamonrails.com/

Transcript

2. Village
3. Open landscape
4. Street
5. City
6. City
7. Crumbling street
8. Building maintenance
9. Big or Small? Stand up if in your codebase you… • have more than 50 models • have a class with more than a 1000 LOC • have an ActiveRecord model with more than 30 :has_many • can’t run your full test suite on your machine • can’t run your test suite on your machine in under 20 minutes
10. Street
11. Structural Engineering in Ruby Stephan Hagemann
13. The only thing that ultimately let’s you reign in complexity within one app are components
14. As a language, Ruby does not have components
15. Gems can act as components
16. …they work well
17. For Rails, the situation kinda sucks…
18. …but works ok
19. Let’s make it better!
39. Just a normal Rails app
 with some extra structure…
42. Structural 
 Costs + Benefits
44. Method 2 LOC Costs Hide logic Benefits Allow Reuse
45. Class 2 LOC Costs Bundle logic and data Benefits Allow Reuse
46. Namespace 2 LOC Costs Prevent naming collisions in the global namespace Benefits Group 
 classes 
 and methods
47. Component
48. WHAT IS A COMPONENT?
49. Labeled Content + Explicit Dependencies
50. Labeled, Unique Content + Explicit, Directed, Acyclic Dependencies
51. @shageman cbra.info ?
52. @shageman cbra.info
53. @shageman cbra.info ? ?
54. Labeled, Unique Content + Explicit, Directed, Acyclic Dependencies
55. @shageman cbra.info
56. A depends on B … A B
57. thus B can not depend on A A B X
58. … and you can’t cheat A B X C
61. Structure Benefit Cost Method Allow reuse, 
 hide logic 2 Class Bundle logic and data, allow reuse 2 Namespace Prevent naming collisions, group classes and methods 2
62. Gem
63. Gem 88 LOC Costs Create provably independent
 package of 
 code Benefits bundle gem awesome_lib Allow 
 Distribution
64. Gem + Engine 528 LOC Costs Create provably independent
 package of 
 code with 
 Rails Benefits rails plugin new components/awesome_engine --full --mountable Allow 
 Distribution
65. Structure Benefit Cost Method Allow reuse, 
 hide logic 2 Class Bundle logic and data, allow reuse 2 Namespace Prevent naming collisions, group classes and methods 2 Component Allow Distribution, Create provably independent package of code 88 Rails Component Allow Distribution, Create provably independent package of code with Rails 528
68. ML predictor X
69. 1 component with 100 elements 1,267,650,600,228,230,000,000,000,000,000 2 component with 50 elements 2,251,799,813,685,150 4 component with 25 elements 134,217,624 5 component with 20 elements 5,242,775 10 component with 10 elements 10,130 * assuming a lot of stuff, including complexity growing according to Reed’s law
70. Structure Benefit Cost Method Allow reuse, 
 hide logic 2 Class Bundle logic and data, allow reuse 2 Namespace Prevent naming collisions, group classes and methods 2 Component Allow Distribution, Create provably independent package of code 88 Rails Component Allow Distribution, Create provably independent package of code with Rails 528
72. 2 LOC Costs
73. Structure Benefit Cost Method Allow reuse, 
 hide logic 2 Class Bundle logic and data, allow reuse 2 Namespace Prevent naming collisions, group classes and methods 2 Component Allow Distribution, Create provably independent package of code 88 Rails Component Allow Distribution, Create provably independent package of code with Rails 528
74. Let’s make it better!
75. Share the stories of your large app!
76. Reduce Rails component costs!
77. Improve CI/CD integrations
78. Fix cross-component 
 dependency versioning
79. Can we create 
 component extractors?
80. Street
81. Building maintenance
82. City
83. Futuristic skyscraper