Question

As far as I can see there are two main principles how to deal with application-wide role player objects like a root model object (in MVC context):

1. create the object and pass it through the object tree (e.g. in the constructor)
2. provide it as a singleton or other global variable technique

The first approach seems to be cleaner because the dependencies are better visible but there is a lot of additional work to do (parameters, class variables,…).

What do you prefer?

Edit: The first technique also uses only one instance but it is provided by passing the object and not by a static function

Answer 1

I prefer run singletons’ method getInstance() as constructor parameter – bake two birds with one stone 😉