Micro Libraries FTW

Transcript

1. Micro Libraries FTW Piotr Solnica wroclove.rb 2014
2. Who am I? Ruby and Rails developer OSS ruby hacker github.com/solnic @_solnic_
3. Ruby Object Mapper github.com/rom-rb
4. Agenda Big libraries vs micro libraries Micro libraries and frameworks Example micro libraries microrb.com
5. Big Libraries vs Micro Libraries
6. BIG LIBRARIES MICRO LIBRARIES Solving many problems Solving just one problem Big LOC Small LOC Wide interfaces Narrow interfaces High churn even after 1.0 Low churn especially after 1.0
7. Rails Influence
8. Ruby developers <3 Rails
9. Rails has a huge impact on how we write Ruby
10. Rails is in favor of huge libraries ActiveSupport and a wide adoption of monkey- patching ActiveRecord-like style - one object with a plethora of responsibilities and mixing seemingly related concerns
11. Rails is great but let’s move on
12. Let’s embrace Unix philosophy
13. “Many UNIX programs do quite trivial things in isolation, but, combined with other programs, become general and useful tools” The UNIX Programming Environment
14. Micro Libraries FTW
15. Why building a micro library?
16. Complex functionality that could be reused Constantly repeated design pattern A specific problem known up front
17. Building frameworks based on micro libraries
18. bottom-up vs top-down
19. bottom-up Really great when you know exactly what you’re doing
20. Does not happen very often
21. top-down Really great even when you don’t know exactly what you’re doing
22. Happens almost all the time
23. Unfortunately top-down approach can be misleading
24. DSL + core domain logic == disaster
25. Frameworks should provide high-level interfaces that are built on top of lower level micro libraries
26. Challenges
27. Dealing with many dependencies is hard
28. rubygems + bundler = slow “meta-gems” PANIC when seeing lots of gems being installed
29. Dependency Hell
30. 2 gems depending on different versions of another gem == HELL
31. Version conflicts between frameworks are the biggest challenge
32. Semantic Versioning
33. Be responsible!
34. Changelogs
35. Tools can help!
36. ruby-toolbox.com lots of information about gems gemnasium.com detailed information about dependencies of gems
37. Example micro libraries
38. github.com/dkubb/equalizer
39. require "equalizer"! ! class GeoLocation! include Equalizer.new(:lat, :lng)! ! attr_reader :lat, :lng! ! def initialize(attributes)! @lat, @lng = attributes.values_at(:lat, :lng)! end! end! ! loc1 = GeoLocation.new(:lat => 123, :lng => 321)! loc2 = GeoLocation.new(:lat => 123, :lng => 321)! ! loc1 == loc2 # true! ! loc1.inspect! => #<GeoLocation lat=123 lng=321>
40. github.com/mbj/anima
41. equalizer + anima
42. require "anima"! ! class GeoLocation! include Anima.new(:lat, :lng)! end! ! loc1 = GeoLocation.new(:lat => 123, :lng => 321)! loc2 = GeoLocation.new(:lat => 123, :lng => 321)! ! loc1 == loc2! # => true
43. virtus + equalizer
44. require "virtus"! ! class GeoLocation! include Virtus.value_object! ! values do! attribute :lat, Float! attribute :lng, Float! end! end! ! loc1 = GeoLocation.new(:lat => "123", :lng => "321")! loc2 = GeoLocation.new(:lat => "123", :lng => "321")! ! loc1 == loc2! # => true
45. How about a framework?
46. Ruby Object Mapper github.com/rom-rb/rom
47. morpher github.com/mbj/morpher
48. rom + morpher
49. module ROM! class Mapper! ! # Abstract loader class! #! # @private! class Loader! ! # some stuff is here! ! # @api public! def call(tuple)! transformer.call(tuple)! end! ! end # Loader! ! end # Mapper! end # ROM This is morpher’s transformer and it takes care of everything
50. virtus 2.0 = anima + morpher
51. microrb.com
52. Gather libraries that meet specific criteria Make it easy to find the right tool for the job Help in connecting maintainers and contributors Promote style of development that adheres to the unix philosophy Promote frameworks that are built on top of micro libraries
53. Thank You! <3<3<3