Java parameter passing following GRASP

Question

So I have a class called Game and I need to retrieve several objects of Game from the database based on their session ID, so I have this method:

public ArrayList<Game> getGamesBySession

Okay, but I have to pass a parameter there so I would know which session's games I want to retrieve and I have two possibilities. I can either pass an int or I can pass an object of Session which has an attribute id and then use session.getID(). In the end, both would result in the same thing basically, but what I am wondering is something else.

My question is, which is a better approach and if I pass an object, would it mean that Game is high coupled with Session and violates GRASP?

Answer 1

That depends, is session.ID just an int? If it is, I would rather pass the entire session in, since getGamesBySession(session) is a lot clearer than getGamesBySession(int).

However, you could also consider wrapping the int into a SessionIdentifier object, which gives a bit more semantic meaning to the value. getGameBySession(SessionIdentifier) is equally as clear and would prevent you from passing in some random int from elsewhere...