What will you do in this situation? Stacks are deep. Hero has AK. You raise 4xbb and get one weak caller from button.

Flop: 972

Hero raises the pot and gets reraised. At this point I would be afraid of a set, giving me 9 absolute outs and if he has hit his set there's outs for him too. What's the strategy? What's the strategy on later streets?

What if the villain is aggressive, does it change the decision? What about if we have position?

I'm asking about this because my friend bought a book about poker where the author suggests a beginner should try to get all of his chips in at the flop. I don't necessarily agree with this, maybe in some situations...