def METHOD_NAME(self):
    """
    Read the stored objects from the cache.
    Return:
        None if the path is not in the cache, else the pickled data
    """
    if self.dirty:
        return None
    try:
        with open(self.path_data["pickle_path"], "r") as f:
            data = pickle.load(f)
            return data
    except:
        return None