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Dependency injection in Controller - shared objects

Hello,
I just installed Sage and started looking around. I found out I can pass my dependencies into the Controller constructor. That works fine, but I don’t see a way to configure the dependency as shared. For example, I have two Controllers, that have the same dependency (let’s say PostsFactory). When I pass it into the Controllers constructor, I end up with two different PostsFactory objects. Is there a way to configure the DI container. Also, is there a way to access the Container (or is there even a DI Container)?

Thanks!
Václav