Data Pull vs. Push OOP Approach

Question

When I design my system from scratch, I often face a dilemma whether my object should push information into another objects OR whether the objects should

Answer 1

The word push/pull is relative. There will be a pusher who has data and there will be a puller who needs data. If we actually store the data in a neutral place and not inside push-er/pull-er, many possibilities raise that suits a given problem at time.One updates the data when he has it(send notification if necessary) and the other pulls the data at his convenience. Many design patterns, MVC, Observer, Command, etc fall in place to handle the scenario.