class Aws::ParamConverter

def converter_for(shape_class, value)
  unless @converters[shape_class].key?(value.class)
    @mutex.synchronize {
      unless @converters[shape_class].key?(value.class)
        @converters[shape_class][value.class] = find(shape_class, value)
      end
    }
  end
  @converters[shape_class][value.class]
end