/** Run the trigger merging logic as part of executing the specified merge. */
public void onMerge(W window, Timers timers, MergingStateAccessor<?, W> state) throws Exception {
// Clone so that we can detect changes and so that changes here don't pollute merging.
FinishedTriggersBitSet finishedSet = readFinishedBits(state.access(FINISHED_BITS_TAG)).copy();
// And read the finished bits in each merging window.
ImmutableMap.Builder<W, FinishedTriggers> builder = ImmutableMap.builder();
for (Map.Entry<W, ValueState<BitSet>> entry :
state.accessInEachMergingWindow(FINISHED_BITS_TAG).entrySet()) {
// Don't need to clone these, since the trigger context doesn't allow modification
builder.put(entry.getKey(), readFinishedBits(entry.getValue()));
// Clear the underlying finished bits.
clearFinishedBits(entry.getValue());
}
ImmutableMap<W, FinishedTriggers> mergingFinishedSets = builder.build();
TriggerStateMachine.OnMergeContext mergeContext =
contextFactory.createOnMergeContext(
window, timers, rootTrigger, finishedSet, mergingFinishedSets);
// Run the merge from the trigger
rootTrigger.invokeOnMerge(mergeContext);
persistFinishedSet(state, finishedSet);
}
