class_docstr: The internal interface for functions that process over grouped windows.
class_docstr_tok: ["The","internal","interface","for","functions","that","process","over","grouped","windows","."]
code: def close(self):
      pass
  
imports: from abc import abstractmethod, ABC
  from typing import Generic, List, Iterable, Dict, Set
  from pyflink.common import Row
  from pyflink.common.constants import MAX_LONG_VALUE
  from pyflink.datastream.state import MapState
  from pyflink.fn_execution.table.window_assigner import WindowAssigner, PanedWindowAssigner, MergingWindowAssigner
  from pyflink.fn_execution.table.window_context import Context, K, W
label_desc: Use image node_id 3 for calling the InternalWindowProcessFunction obj's underlying member method code with example usage: obj.close() without return types