class_docstr: Internal implementation of InternalTimerService.
code: def __init__(self, keyed_state_backend):
      self._keyed_state_backend = keyed_state_backend
      self._current_watermark = None
      self._timer_coder_impl = None
      self._output_stream = None
  
      from apache_beam.transforms.window import GlobalWindow
  
      self._global_window = GlobalWindow()
  
imports: import collections
  import time
  from enum import Enum
  from io import BytesIO
  from pyflink.common import Row
  from pyflink.datastream import TimerService
  from pyflink.fn_execution.datastream.timerservice import InternalTimer, K, N, InternalTimerService
label_desc: Use image node_id 1 to create a new InternalTimerServiceImpl object from inherited base classes: InternalTimerService with example: obj = InternalTimerServiceImpl(keyed_state_backend)