def exportValue(self, vf, value):
        m = StrStrHashMap(value)
        keysAndValues = []
        for i in m.keys():
            keysAndValues.append(i)
            keysAndValues.append(m[i])
def __init__(self, schema_file: str):
        self._schema = artifact_utils.read_schema_file(schema_file)

        self._type_name, self._metric_fields = artifact_utils.parse_schema(
            self._schema)

        self._values = {}