config1.rb

class Configuration
  @@value = 1

  def self.value
    @@value
  end
end

config2.rb

class Configuration
  @@value = 2

  def self.value
    @@value
  end
end

process.rb

module One
  require 'config1'
end

module Two
  require 'config2'
end

def process(config)
  puts config.value
end

process One::Configuration
process Two::Configuration