GitLab Ability class add class method cache benchmarks

benchmark-results.txt

Calculating -------------------------------------
project_guest_rules without method cache
                        79.352k i/100ms
project_guest_rules with method cache
                        93.634k i/100ms
-------------------------------------------------
project_guest_rules without method cache
                          2.865M (±32.5%) i/s -     11.982M
project_guest_rules with method cache
                          4.419M (± 7.4%) i/s -     22.004M

Comparison:
project_guest_rules with method cache:  4418908.0 i/s
project_guest_rules without method cache:  2864514.0 i/s - 1.54x slower

Calculating -------------------------------------
project_report_rules without method cache
                        53.126k i/100ms
project_report_rules with method cache
                        97.473k i/100ms
-------------------------------------------------
project_report_rules without method cache
                          1.093M (±36.5%) i/s -      4.675M
project_report_rules with method cache
                          4.420M (± 7.2%) i/s -     22.029M

Comparison:
project_report_rules with method cache:  4420054.3 i/s
project_report_rules without method cache:  1092509.6 i/s - 4.05x slower

test.rb

require 'benchmark/ips'
require_relative 'app/models/ability'

puts Ability.project_guest_rules.inspect
puts "--------------------"
puts Ability.project_guest_rules_with_method_cache.inspect

Benchmark.ips do |x|
  x.report("project_guest_rules without method cache") do
    Ability.project_guest_rules
  end
  x.report("project_guest_rules with method cache") do
    Ability.project_guest_rules_with_method_cache
  end
  x.compare!
end


Benchmark.ips do |x|
  x.report("project_report_rules without method cache") do
    Ability.project_report_rules
  end
  x.report("project_report_rules with method cache") do
    Ability.project_report_rules_with_method_cache
  end
  x.compare!
end