code: def process_timer(self, tag, timer_data):
      if self._has_side_output:
          # the field user_key holds the timer data
          for tag, row in self.operation.process_timer(
              timer_data.user_key
          ):
              for p in self._output_processors.get(tag, []):
                  p.process_outputs(
                      self._reusable_windowed_value, [row]
                  )
      else:
          self._main_output_processor.process_outputs(
              self._reusable_windowed_value,
              # the field user_key holds the timer data
              self.operation.process_timer(timer_data.user_key),
          )
  
imports: import abc
  from abc import abstractmethod
  from typing import Iterable, Any, Dict, List
  from apache_beam.runners.worker.bundle_processor import TimerInfo, DataOutputOperation
  from apache_beam.runners.worker.operations import Operation
  from apache_beam.utils import windowed_value
  from apache_beam.utils.windowed_value import WindowedValue
  from pyflink.common.constants import DEFAULT_OUTPUT_TAG
  from pyflink.fn_execution.flink_fn_execution_pb2 import UserDefinedDataStreamFunction
  from pyflink.fn_execution.table.operations import BundleOperation
  from pyflink.fn_execution.profiler import Profiler
label_desc: Use image node_id 4 for calling the StatefulFunctionOperation obj's underlying member method code with example usage: obj.process_timer(tag, timer_data) without return types