When you really need to know a class name

class Module

  # call-seq:
  #    logger_name    #=> string
  #
  # Returns a predictable logger name for the current module or class. If
  # used within an anonymous class, the first non-anonymous class name will
  # be used as the logger name. If used within a meta-class, the name of the
  # actual class will be used as the logger name. If used within an
  # anonymous module, the string 'anonymous' will be returned.
  #
  def logger_name
    return name unless name.empty?

    # check if this is a metaclass (or eigenclass)
    if ancestors.include? Class
      inspect =~ %r/#<Class:([^#>]+)>/
      return $1
    end

    # see if we have a superclass
    if respond_to? :superclass
      return superclass.logger_name
    end

    # we are an anonymous module
    ::Logging.log_internal(-2) {
      'cannot return a predictable, unique name for anonymous modules'
    }
    return 'anonymous'
  end
end