code: def _generate_object_id(self):
      while True:
          new_id = plasma.ObjectID.from_random()
          if not self._client.contains(new_id):
              return new_id
  
imports: import asyncio
  import sys
  from dataclasses import dataclass
  from functools import lru_cache
  from typing import Any, Dict, List, Optional, Tuple
  import psutil
  import pyarrow
  from ..resource import virtual_memory
  from ..serialization import AioSerializer, AioDeserializer
  from ..utils import implements, dataslots, calc_size_by_str, lazy_import
  from .base import StorageBackend, StorageLevel, ObjectInfo, register_storage_backend
  from .core import BufferWrappedFileObject, StorageFileObject
  from .errors import DataNotExist
label_desc: Use image node_id 5 for calling the PlasmaStorage obj's underlying member method code with example usage: obj._generate_object_id() and returns: new_id