code: def message_cache(self) -> ForwardMsgCache:
      return self._message_cache
  
imports: from __future__ import annotations
  import asyncio
  import time
  import traceback
  from dataclasses import dataclass, field
  from enum import Enum
  from typing import TYPE_CHECKING, Awaitable, Dict, NamedTuple, Optional, Tuple, Type
  from typing_extensions import Final
  from streamlit import config
  from streamlit.logger import get_logger
  from streamlit.proto.BackMsg_pb2 import BackMsg
  from streamlit.proto.ForwardMsg_pb2 import ForwardMsg
  from streamlit.runtime.app_session import AppSession
  from streamlit.runtime.caching import get_data_cache_stats_provider, get_resource_cache_stats_provider
  from streamlit.runtime.caching.storage.local_disk_cache_storage import LocalDiskCacheStorageManager
  from streamlit.runtime.forward_msg_cache import ForwardMsgCache, create_reference_msg, populate_hash_if_needed
  from streamlit.runtime.legacy_caching.caching import _mem_caches
  from streamlit.runtime.media_file_manager import MediaFileManager
  from streamlit.runtime.media_file_storage import MediaFileStorage
  from streamlit.runtime.memory_session_storage import MemorySessionStorage
  from streamlit.runtime.runtime_util import is_cacheable_msg
  from streamlit.runtime.script_data import ScriptData
  from streamlit.runtime.scriptrunner.script_cache import ScriptCache
  from streamlit.runtime.session_manager import ActiveSessionInfo, SessionClient, SessionClientDisconnectedError, SessionManager, SessionStorage
  from streamlit.runtime.state import SCRIPT_RUN_WITHOUT_ERRORS_KEY, SessionStateStatProvider
  from streamlit.runtime.stats import StatsManager
  from streamlit.runtime.uploaded_file_manager import UploadedFileManager
  from streamlit.runtime.websocket_session_manager import WebsocketSessionManager
  from streamlit.watcher import LocalSourcesWatcher
label_desc: Use image node_id 5 for calling the Runtime obj's underlying member method code with example usage: obj.message_cache() and returns: self