How to reuse ng-controller as singleton?

Question

Angular

Each time the ng-controller directive is used, a new controller instance is created.
Is it possible to make such a controller a singleton? If so, how?
PS: The option to transfer the directive to one of the parent elements is not feasible in my case.

Answer 1

For this factory are invented. Use at least 50 instances of the controller, and store the data in one place.