code: def launch(self, args=None):
          
          self.options = self.parse_args(args)
          if self.options.saveinputmeta:
              # save original input options
              self.save_input_meta()
          if self.options.inputmeta:
              # read new options from JSON file
              self.options = self.get_options_from_file(self.options.inputmeta)
          self.run(self.options)
          # if required save meta data for the output after running the plugin app
          if self.options.saveoutputmeta:
              self.save_output_meta()
docs: This method triggers the parsing of arguments.