Is There a Consistency Between a Handler and a Controller?

So i mentioned mu transit a few times before, but so i've recently started using that, and i saw a lot of parallels. So must transit for event driven stuffs, can publish and subscribe to es,. You have a consumer, it must transit, which is a class, and it implements an interface. And that forces you to have a message called consume, which takes in the message. But the idea is it's one class. It's got one method that its consumer must transit, and it supports, now it depends injection. Everything's nice and simple and consistent. I would like the just consistency of it.