def on_processing_time(self, timer: InternalTimer):
result = []
timestamp = timer.get_timestamp()
key = timer.get_key()
self._state_backend.set_current_key(key)
window = timer.get_namespace()
self._trigger_context.window = window
if self._trigger_context.on_processing_time(timestamp):
# fire
result.append(self._emit_window_result(key, window))
if not self._window_assigner.is_event_time():
self._window_function.clean_window_if_needed(window, timestamp)
return result
def on_event_time(self, timer: InternalTimer) -> None:
self.trigger_context.user_key = self.user_key_selector(timer.get_key())
self.trigger_context.window = timer.get_namespace()
if isinstance(self.window_assigner, MergingWindowAssigner):
merging_windows = self.get_merging_window_set()
state_window = merging_windows.get_state_window(
self.trigger_context.window)
if state_window is None:
# Timer firing for non-existent window, this can only happen if a
# trigger did not clean up timers. We have already cleared the merging
# window and therefore the Trigger state, however, so nothing to do.
return
else:
self.window_state.set_current_namespace(state_window)
else:
self.window_state.set_current_namespace(
self.trigger_context.window)
merging_windows = None
trigger_result = self.trigger_context.on_event_time(
timer.get_timestamp())
if trigger_result.is_fire():
contents = self.window_state.get()
# for list state the iterable will never be none
if isinstance(self.window_state, ListState):
contents = [i for i in contents]
if len(contents) == 0:
contents = None
if contents is not None:
yield from self.emit_window_contents(
self.trigger_context.window, contents)
if trigger_result.is_purge():
self.window_state.clear()
if self.window_assigner.is_event_time() and self.is_cleanup_time(
self.trigger_context.window, timer.get_timestamp()):
self.clear_all_state(self.trigger_context.window,
self.window_state, merging_windows)
if merging_windows is not None:
merging_windows.persist()