emit partial state in window (streaming)

[Luis Mariano Guerra]

hi,

 I need to calculate some counts for the day but also emit the partial
counts periodically, I think triggers may help me, I'm searching around but
there's not much content about it, any tip?

for example I'm counting access by location to different services, I want
to accumulate access during the whole day, but I want to emit the partial
count every 5 minutes.

one slightly related question, is there a way to align a window to a day?
for example a 24 hour window that starts at 00:00.

thanks.