Create a vanilla Rails
rails _5.0.7_ new vanilla_test --skip-yarn --skip-active-storage --skip-action --skip-sprockets --skip-spring --skip-listen --skip-coffee --skip-javascript --skip-turbolinks --skip-test --skip-system-test --skip-bootsnap
Copy the files into the right spots
Run it
bin/rails r lock_it_up.rb
Interesting points:
| # app/models/concerns/foo_concern.rb | |
| module FooConcern | |
| def blah | |
| end | |
| end |
| # app/models/foo_model.rb | |
| class FooModel < ApplicationRecord | |
| # # Some slow operation to allow another thread to get in here. | |
| # puts "#{Thread.current} Start slowdown" | |
| # t1 = Time.now | |
| # until Time.now >= t1 + 3 | |
| # end | |
| # puts "#{Thread.current} End slowdown" | |
| include FooConcern | |
| end |
| puts "Start." | |
| t1 = Thread.new do | |
| #ActiveSupport::Dependencies.interlock.permit_concurrent_loads do | |
| "FooModel".constantize | |
| #end | |
| end | |
| t2 = Thread.new do | |
| #ActiveSupport::Dependencies.interlock.permit_concurrent_loads do | |
| "FooModel".constantize | |
| #end | |
| end | |
| t1.join | |
| t2.join | |
| puts "Done." |