def sort_collectors!
      @sorted_collectors = {}

      tmp = @collectors.sort_by { |_klass, definition| definition.position }
      tmp.each { |_k, v| @sorted_collectors[v.identifier.to_sym] = v }
    end
def sort_collectors!
      @sorted_collectors = {}

      tmp = @collectors.sort_by { |_klass, definition| definition.position }
      tmp.each { |_k, v| @sorted_collectors[v.identifier.to_sym] = v }
    end
Sort collectors by definition identifier.