@Override
public void processElement(WindowedValue<KeyedWorkItem<K, V>> element) throws Exception {
KeyedWorkItem<K, V> workItem = element.getValue();
K key = workItem.key();
UncommittedBundle<KV<K, Iterable<V>>> bundle =
evaluationContext.createBundle(application.getOutput());
outputBundles.add(bundle);
CopyOnAccessInMemoryStateInternals<K> stateInternals =
(CopyOnAccessInMemoryStateInternals<K>) stepContext.stateInternals();
DirectTimerInternals timerInternals = stepContext.timerInternals();
ReduceFnRunner<K, V, Iterable<V>, BoundedWindow> reduceFnRunner =
new ReduceFnRunner<>(
key,
windowingStrategy,
ExecutableTriggerStateMachine.create(
TriggerStateMachines.stateMachineForTrigger(windowingStrategy.getTrigger())),
stateInternals,
timerInternals,
new DirectWindowingInternals<>(bundle),
droppedDueToClosedWindow,
reduceFn,
evaluationContext.getPipelineOptions());
// Drop any elements within expired windows
reduceFnRunner.processElements(
dropExpiredWindows(key, workItem.elementsIterable(), timerInternals));
for (TimerData timer : workItem.timersIterable()) {
reduceFnRunner.onTimer(timer);
}
reduceFnRunner.persist();
}
@Override
public TransformResult finishBundle() throws Exception {
// State is initialized within the constructor. It can never be null.
CopyOnAccessInMemoryStateInternals<?> state = stepContext.commitState();
return StepTransformResult.withHold(application, state.getEarliestWatermarkHold())
.withState(state)
.addOutput(outputBundles)
.withTimerUpdate(stepContext.getTimerUpdate())
.withAggregatorChanges(aggregatorChanges)
.addUnprocessedElements(unprocessedElements.build())
.build();
}