def METHOD_NAME(self):
    """
    cleans directories and call finish
    """
    time.sleep(0.2) # to prevent from sync algorithm interpreting we are renaming
    if self.delete_tmp_files:
        try:
            shutil.rmtree(self.local_folder_in)
        except OSError:
            pass
    time.sleep(1.2) # to prevent from sync algorithm interpreting we are renaming
    self.rnd_folder = get_random_str()
    self.local_folder_in = os.path.join(self.local_mount_in, self.rnd_folder)
    self.local_folder_out = os.path.join(self.local_mount_out, self.rnd_folder)
    self.work_folder = os.path.join(self.work_folder, self.rnd_folder) 
    self.prepare_folders();          