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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def load_stored_routine(self):
 """ Loads the stored routine into the instance of MySQL. Returns the metadata of the stored routine if the stored routine is loaded successfully. Otherwise returns False. :rtype: dict[str,str]|bool """

        try:
            self._routine_name = os.path.splitext(os.path.basename(self._source_filename))[0]

            if os.path.exists(self._source_filename):
                if os.path.isfile(self._source_filename):
                    self._m_time = int(os.path.getmtime(self._source_filename))
                else:
                    raise LoaderException("Unable to get mtime of file '{}'".format(self._source_filename))
            else:
                raise LoaderException("Source file '{}' does not exist".format(self._source_filename))

            if self._pystratum_old_metadata:
                self._pystratum_metadata = self._pystratum_old_metadata

            load = self._must_reload()
            if load:
                self.__read_source_file()

                self.__get_placeholders()

                self._get_designation_type()

                self._get_name()

                self.__substitute_replace_pairs()

                self._load_routine_file()

                if self._designation_type == 'bulk_insert':
                    self._get_bulk_insert_table_columns_info()

                self._get_routine_parameters_info()

                self.__get_doc_block_parts_wrapper()

                self.__save_shadow_copy()

                self._update_metadata()

            return self._pystratum_metadata

        except Exception as exception:
            self._log_exception(exception)
            return False