class_docstr: Used to provide to Java side to check whether its parent process is alive.
code: def ping(self):
      time.sleep(10)
      return True
  
imports: import importlib
  import os
  import shlex
  import shutil
  import struct
  import tempfile
  import time
  from logging import WARN
  from threading import RLock
  from py4j.java_gateway import java_import, logger, JavaGateway, GatewayParameters, CallbackServerParameters
  from pyflink.find_flink_home import _find_flink_home
  from pyflink.pyflink_gateway_server import launch_gateway_server_process
  from pyflink.util.exceptions import install_exception_handler, install_py4j_hooks
label_desc: Use image node_id 1 for calling the Watchdog obj's underlying member method code with example usage: obj.ping() and returns: True