class_docstr: Contains session data for a single "user" of an active app
  (that is, a connected browser tab).
  
  Each AppSession has its own ScriptData, root DeltaGenerator, ScriptRunner,
  and widget state.
  
  An AppSession is attached to each thread involved in running its script.
class_docstr_tok: ["Contains","session","data","for","a","single","``","user","''","of","an","active","app","(","that","is",",","a","connected","browser","tab",")",".","Each","AppSession","has","its","own","ScriptData",",","root","DeltaGenerator",",","ScriptRunner",",","and","widget","state",".","An","AppSession","is","attached","to","each","thread","involved","in","running","its","script","."]
docstr: Shut down the AppSession.
  
  It's an error to use a AppSession after it's been shut down.
docstr_tok: ["Shut","down","the","AppSession",".","It","'s","an","error","to","use","a","AppSession","after","it","'s","been","shut","down","."]
code: def shutdown(self) -> None:
      """Shut down the AppSession.
  
      It's an error to use a AppSession after it's been shut down.
  
      """
      if self._state != AppSessionState.SHUTDOWN_REQUESTED:
          LOGGER.debug("Shutting down (id=%s)", self.id)
          # Clear any unused session files in upload file manager and media
          # file manager
          self._uploaded_file_mgr.remove_session_files(self.id)
  
          if runtime.exists():
              rt = runtime.get_instance()
              rt.media_file_mgr.clear_session_refs(self.id)
              rt.media_file_mgr.remove_orphaned_files()
  
          # Shut down the ScriptRunner, if one is active.
          # self._state must not be set to SHUTDOWN_REQUESTED until
          # *after* this is called.
          self.request_script_stop()
  
          self._state = AppSessionState.SHUTDOWN_REQUESTED
  
          # Disconnect all file watchers if we haven't already, although we will have
          # generally already done so by the time we get here.
          self.disconnect_file_watchers()
  
imports: import asyncio
  import sys
  import uuid
  from enum import Enum
  from typing import TYPE_CHECKING, Callable, Dict, List, Optional, Union
  import streamlit.elements.exception
  from streamlit import config, runtime, source_util
  from streamlit.case_converters import to_snake_case
  from streamlit.logger import get_logger
  from streamlit.proto.BackMsg_pb2 import BackMsg
  from streamlit.proto.ClientState_pb2 import ClientState
  from streamlit.proto.Common_pb2 import FileURLs, FileURLsRequest
  from streamlit.proto.ForwardMsg_pb2 import ForwardMsg
  from streamlit.proto.GitInfo_pb2 import GitInfo
  from streamlit.proto.NewSession_pb2 import Config, CustomThemeConfig, NewSession, UserInfo
  from streamlit.proto.PagesChanged_pb2 import PagesChanged
  from streamlit.runtime import caching, legacy_caching
  from streamlit.runtime.forward_msg_queue import ForwardMsgQueue
  from streamlit.runtime.metrics_util import Installation
  from streamlit.runtime.script_data import ScriptData
  from streamlit.runtime.scriptrunner import RerunData, ScriptRunner, ScriptRunnerEvent
  from streamlit.runtime.scriptrunner.script_cache import ScriptCache
  from streamlit.runtime.secrets import secrets_singleton
  from streamlit.runtime.uploaded_file_manager import UploadedFileManager
  from streamlit.version import STREAMLIT_VERSION_STRING
  from streamlit.watcher import LocalSourcesWatcher
label_desc: Use image node_id 6 for calling the AppSession obj's underlying member method code with example usage: obj.shutdown() without return types