Waza 2013

My Talk at Waza 2013

Transcript

2. WAZZAAAAAAAAA
3. WAZZAAAAAAAAA Corded? CRT?
4. Aaron Patterson @tenderlove
5. AT&T, AT&T logo and all AT&T related marks are trademarks of AT&T Intellectual Property and/or AT&T affiliated companies.
6. Interfaces & Adapters
8. “The Next Twitter”
9. “Disrupting the way you eat toast”
11. ☑Adequate Everything. Adequately.
12. “You get what we think you paid for”
13. SEO Optimization
14. First Search Engine
18. Leif Erikson
19. Leif Erikson (Later invented Cell Phones)
20. Google
21. Yahoo!
22. Bing
25. Alexander Searchkeyword
26. Alexander Searchkeyword
27. Doing Client Work.
28. Technical Co-Founding As A Service
29. recruiterspam.com
30. Unfactoring
31. Rails.queue
32. Using the Queue job = MyJob.new Rails.queue << job
33. Consumer Thread.new { while job = Rails.queue.pop job.run end }
34. Problems.
36. “What about exceptions?”
37. “What about exceptions?” “It’s queue specific.”
39. “What about serialization?”
40. “What about serialization?” “It’s queue specific.”
42. “What about job construction?”
43. “What about job construction?” “It must be marshallable.”
44. Job Construction user = User.find 1 job = Job.new user Rails.queue << job
45. Job Construction user = User.find 1 job = Job.new user Rails.queue << job NOPE
46. Job Construction user = User.find 1 job = Job.new user.id Rails.queue << job
47. Job Definition class Job def initialize(user_id) @user_id = user_id end def run user = User.find @user_id # .... end end
48. Too Many Open Questions.
49. Rails.queue
51. minitest/spec
52. describe "whatever" do setup do # ... end it "does some stuff" do 1.must_equal 1 end describe "some other stuff" do it "does some other stuff" do 'foo'.must_match /foo/ end end end
53. class SomeTest < ActiveSupport::TestCase setup { # ... } test "some thing" do # ... end end Rails Tests
54. MiniTest::Spec class SomeTest < MiniTest::Spec setup { # ... } it "some thing" do # ... end end
55. Refactor class SomeTest < MiniTest::Spec class << self alias :test :it end setup { # ... } test "some thing" do # ... end end
56. AS::TestCase class ActiveSupport::TestCase < MiniTest::Spec class << self alias :test :it end end class SomeTest < ActiveSupport::TestCase setup { # ... } test "some thing" do # ... end end
57. mt/spec superclass > MiniTest::Spec.ancestors => [MiniTest::Spec, MiniTest::Unit::TestCase, ... ]
58. Free goodies! describe "whatever" do it "does some stuff" do 1.must_equal 1 end describe "some other stuff" do it "does some other stuff" do 'foo'.must_match /foo/ end end end
59. minitest/spec
61. Meta-Programming
62. What is it?
63. Code that writes Code
64. Defining Methods
65. attr_accessor class Foo attr_accessor :bar end
66. attr_accessor class Foo def bar; @bar; end def bar=(bar); @bar = bar; end end
67. eval class Foo eval "def bar; :hi; end" end Foo.new.bar # => :hi
68. class_eval class Foo end Foo.eval "def bar; :hi; end" # => error Foo.class_eval "def bar; :hi; end" # => ok! Foo.new.bar # => :hi
69. define_method class Foo define_method(:bar) { :hi } end Foo.new.bar # => :hi
70. eval vs d_m ❤ How code is parsed ❤ Method environment
71. Parser (eval) # test.rb class Foo 10.times { |i| class_eval "def b_#{i}; :hi; end", __FILE__, __LINE__ } end # x.d ruby$target:::parse-begin /copyinstr(arg0) == "test.rb"/ { printf("%s:%d\n", copyinstr(arg0), arg1); } R uby 2.0!
72. DTrace Run $ sudo dtrace -q -s x.d -c'ruby test.rb' test.rb:1 test.rb:3 test.rb:3 test.rb:3 test.rb:3 test.rb:3 test.rb:3 test.rb:3 test.rb:3 test.rb:3 test.rb:3 $
73. Parser (def_m) # test.rb class Foo 10.times { |i| define_method("b_#{i}") { :hi } } end # x.d ruby$target:::parse-begin /copyinstr(arg0) == "test.rb"/ { printf("%s:%d\n", copyinstr(arg0), arg1); } R uby 2.0!
74. DTrace Run $ sudo dtrace -q -s x.d -c'ruby test.rb' test.rb:1 $
75. Environment class Foo hello = "world!" define_method("foo") { hello } class_eval "def bar; hello; end" end x = Foo.new x.foo # => "world!" x.bar # => NameError
76. Definition Speed class Foo if ENV['CLASS_EVAL'] 100_000.times do |i| class_eval("def x_#{i}; end") end else 100_000.times do |i| define_method("x_#{i}") { } end end end
77. $ DEF_METH=1 time -p ruby test.rb real 0.63 user 0.56 sys 0.05 $ CLASS_EVAL=1 time -p ruby test.rb real 3.62 user 3.52 sys 0.09
78. Method Call Speed require 'benchmark/ips' GC.disable class Foo class_eval("def foo; end") define_method("bar") { } end Benchmark.ips do |x| F = Foo.new x.report("define_method") { F.bar } x.report("class_eval") { F.foo } end
79. Calculating ------------------------------------- define_method 100965 i/100ms class_eval 107181 i/100ms ------------------------------------------------- define_method 4801218.4 (±6.3%) i/s - 23928705 in 5.008944s class_eval 7386563.1 (±8.9%) i/s - 36548721 in 5.003122s Iterations / sec
80. Call + Work require 'benchmark/ips' GC.disable class Foo class_eval("def foo; 2.times.map { 'foo' } end") define_method("bar") { 2.times.map { "foo" } } end Benchmark.ips do |x| F = Foo.new x.report("define_method") { F.bar } x.report("class_eval") { F.foo } end
81. Iterations / sec Calculating ------------------------------------- define_method 42364 i/100ms class_eval 44085 i/100ms ------------------------------------------------- define_method 612296.0 (±7.1%) i/s - 3050208 in 5.007636s class_eval 558666.2 (±12.1%) i/s - 2689185 in 5.181042s
82. Memory $ CLASS_EVAL=1 time -l ruby test.rb 3.63 real 3.53 user 0.08 sys 126648320 maximum resident set size 0 average shared memory size 0 average unshared data size 0 average unshared stack size $ DEFN=1 time -l ruby test.rb 0.63 real 0.57 user 0.06 sys 69734400 maximum resident set size 0 average shared memory size 0 average unshared data size 0 average unshared stack size
83. Measure ISeq require 'objspace' N = (ENV['N'] || 100_000).to_i class Foo N.times do |i| if ENV['CLASS_EVAL'] class_eval("def x_#{i}; end") else define_method("x_#{i}") { } end end end GC.start p ObjectSpace.memsize_of_all(RubyVM::InstructionSequence) R uby 1.9.3+
84. Results $ CLASS_EVAL=1 ruby test.rb 38659482 $ DEFN=1 ruby test.rb 259482 $ N=200000 DEFN=1 ruby test.rb 259482
85. define_method
86. define_method ISeq def a1 def a3 def a2
87. class_eval
88. class_eval ISeq def a1 def a3 def a2 ISeq ISeq
89. Closure Leaks class Foo x = "X" * 1024 define_method("x") { } end class Bar x = "X" * 1024 class_eval("def x; end") end
90. Cleaning up a MetaMess
91. BAD Code that writes BAD Code
92. @module.module_eval <<-END_EVAL def #{name}(*args) if #{optimize_helper?(route)} && args.size == #{route.required_parts.size} && !args.last.is_a? (Hash) && optimize_routes_generation? options = #{options.inspect} options.merge!(url_options) if respond_to? (:url_options) options[:path] = "#{optimized_helper(route)}" ActionDispatch::Http::URL.url_for(options) else url_for(handle_positional_args(args, #{options.inspect}, #{route.segment_keys.inspect})) end end END_EVAL
93. @module.module_eval <<-END_EVAL def #{name}(*args) # ... end END_EVAL Creates Methods
94. Conditionals @module.module_eval <<-END_EVAL def #{name}(*args) if #{optimize_helper?(route)} && args.size == #{route.required_parts.size} && ! args.last.is_a?(Hash) && optimize_routes_generation? # ... else # ... end end END_EVAL
95. I heard you like Conditionals
96. Identify Variables
97. Extract Static Data
98. + def if_#{name}(t, options, path) + options.merge!(url_options) + options[:path] = path + ActionDispatch::Http::URL.url_for(options) + end + def #{name}(*args) if #{optimize_helper?(route)} options = #{options.inspect} - options.merge!(url_options) - options[:path] = "#{optimized_helper(route)}" - ActionDispatch::Http::URL.url_for(options) + if_#{name}(self, options, "#{optimized_helper(route)}") else - url_for(...) + UrlHelp.new.url_else(...)
99. + def if_#{name}(t, options, path) + options.merge!(url_options) + options[:path] = path + ActionDispatch::Http::URL.url_for(options) + end + def #{name}(*args) if #{optimize_helper?(route)} options = #{options.inspect} - options.merge!(url_options) - options[:path] = "#{optimized_helper(route)}" - ActionDispatch::Http::URL.url_for(options) + if_#{name}(self, options, "#{optimized_helper(route)}") else - url_for(...) + UrlHelp.new.url_else(...)
100. + def url_if(t, options, path) + options.merge!(t.url_options) if t.respond_to?(:url_options) + options[:path] = path + ActionDispatch::Http::URL.url_for(options) + end + def handle_positional_args(t, args, options, segment_keys) inner_options = args.extract_options! result = options.dup @@ -192,17 +198,10 @@ module ActionDispatch def define_url_helper(route, name, options) @module.remove_possible_method name @module.module_eval <<-END_EVAL, __FILE__, __LINE__ + 1 - - def if_#{name}(t, options, path) - options.merge!(url_options) if t.respond_to?(:url_options) - options[:path] = path - ActionDispatch::Http::URL.url_for(options) - end Remove From Eval eval
101. Create Objects
102. class UrlHelper def self.create(options) new options end def initialize @options = options end def url_else(t, args, seg) # ... end def url_if(t, path) # ... end end
103. @module.module_eval <<-END_EVAL def #{name}(*args) if #{optimize_helper?(route)} # ... options = #{options.inspect} UrlHelp.new.url_if(self, options, "#{optimized_helper(route)}") else UrlHelp.new.url_else(self, args, # ... ) end end END_EVAL
104. Eliminate Conditionals
105. Factory Method class UrlHelper def self.create(route, options) if optimize_helper?(route) OptimizedUrlHelper.new(route, options) else new route, options end end # ... end
106. Final Meta-Code helper = UrlHelper.create(route, options.dup) @module.module_eval do define_method(name) do |*args| helper.call self, args end end
107. Recap Extract Functions Build Objects Eliminate Conditional
108. Avoid a MetaMess
109. When you’ve gone too far.
110. # * <tt>:terminator</tt> - Determines when a before filter will halt the # callback chain, preventing following callbacks from being called and # the event from being triggered. This is a string to be eval'ed. The # result of the callback is available in the +result+ variable. # # define_callbacks :validate, terminator: 'result == false'
111. This is a string to be eval'ed.
112. THIS PARAMETER IS CRAZY TOWN.
113. Avoid Conditionals
114. Keep It Simple.
115. Mamba Time
116. My Weight
117. Health Walk.
118. Find your Mamba Time
119. Be the Best Mamba Timer
120. Office Hours
121. @gorbypuff
122. Thank You!