class Module

:nodoc:
Current.new.user # => NoMethodError

end
thread_mattr_reader :user, instance_reader: false
class Current

instance_reader: false or instance_accessor: false.
If you want to opt out the creation on the instance reader method, pass

# => NameError: invalid attribute name: 1_Badname
end
thread_mattr_reader :"1_Badname"
module Foo

The attribute name must be a valid method name in Ruby.

Current.user # => "DHH"
Thread.current[:attr_Current_user] = "DHH"
Current.user # => nil

end
thread_mattr_reader :user
module Current

The underlying per-thread class variable is set to +nil+, if it is not previously defined.
Defines a per-thread class attribute and creates class and instance reader methods.

def thread_mattr_reader(*syms) # :nodoc:
  options = syms.extract_options!
  syms.each do |sym|
    raise NameError.new("invalid attribute name: #{sym}") unless sym =~ /^[_A-Za-z]\w*$/
    class_eval(<<-EOS, __FILE__, __LINE__ + 1)
      def self.#{sym}
        Thread.current["attr_"+ name + "_#{sym}"]
      end
    EOS
    unless options[:instance_reader] == false || options[:instance_accessor] == false
      class_eval(<<-EOS, __FILE__, __LINE__ + 1)
        def #{sym}
          Thread.current["attr_"+ self.class.name + "_#{sym}"]
        end
      EOS
    end
  end
end