class_docstr: Handler which handles normal input data.
class_docstr_tok: ["Handler","which","handles","normal","input","data","."]
code: def _on_event_time(self, timestamp, key, namespace) -> Iterable:
      yield from self._on_event_time_func(timestamp, key, namespace)
  
imports: from abc import ABC
  from enum import Enum
  from typing import cast, Iterable
  from pyflink.common import Row
  from pyflink.common.constants import DEFAULT_OUTPUT_TAG
  from pyflink.datastream.output_tag import OutputTag
  from pyflink.fn_execution.datastream.process.timerservice_impl import InternalTimerServiceImpl
label_desc: Use image node_id 3 for calling the TimerHandler obj's underlying member method code with example usage: obj._on_event_time(timestamp, key, namespace) without return types