Singleton Logger wrapper including a progname

dynamic_logger_progname.rb

require_relative './example_logger'

class ExampleClass
  def initialize
    ExampleLogger.info("Initializing ExampleClass")
  end
end

ExampleClass.new

example_logger.rb

require 'logger'
require 'singleton'

class ExampleLogger
  include Singleton

  attr_accessor :logger
  def initialize
    @logger = Logger.new(STDOUT)
    @logger.formatter = proc do |sev, datetime, progname, msg|
      "#{progname}, #{msg}\n"
    end
  end

  def self.method_missing(method, *args, &blk)
    if valid_method? method
      instance.logger.progname = caller(1).first
      instance.logger.send(method, *args, &blk)
    else
      super
    end
  end

  def self.respond_to_missing?(method)
    if valid_method? method
      true
    else
      super
    end
  end

  def self.valid_method?(method)
    instance.logger.respond_to? method
  end

end