class AsyncJsonDescriptionReader:
    file = None
    locker = None

    def read(self):
        AsyncJsonDescriptionReader.locker.acquire()
        string = AsyncJsonDescriptionReader.file.readline()
        AsyncJsonDescriptionReader.locker.release()
        if len(string) > 0:
           return self.transformer.transform(json.loads(string))
        else:
            return None

    def __init__(self, description_path, ind):
        self.ind = ind
        if AsyncJsonDescriptionReader.locker is None:
            AsyncJsonDescriptionReader.locker = Lock()
        if AsyncJsonDescriptionReader.file is None:
            AsyncJsonDescriptionReader.file = open(description_path, 'r')
        print(id(AsyncJsonDescriptionReader.locker), id(AsyncJsonDescriptionReader.file))
        self.transformer = JSON2ClassTransformer()