Unique instance of service

random is rando what do you expect ? !!!!!!  can be same result

I want to have the same result into the 2 controllers :
On the first call of a controller : the service is init so the idRandom take a value between 0 and 10 000 for example 999
On a second call of the controller or another one which use this service i want to get the same instance to get the same idRandom in my example 999