puma concurrency

# Do a `gem install rack` first
#
# Running with `puma -t 1` we see the request blocking.
# Running with `puma` there is no blocking (default is `-t 16`)
#
# Maybe filler is not thread safe and we have a rece condition somewhere.
# If this is the case, running `puma -t 1 -w 10` should work fine (10 processes, 1 thread for process).

require "rack"

app = Rack::Builder.app do
  map '/fast' do
    run Proc.new { |env| 
      puts "Executing fast path"
      ['200', {'Content-Type' =>  'text/plain'}, ["I am fast!\n"]]
    }
  end

  map '/slow' do
    run Proc.new { |env| 
      puts "Executing slow path"
      sleep(20) # blocking call
      ['200', {'Content-Type' =>  'text/plain'}, ["I am slow!\n"]]
    }
  end
end

run app