[Philip-J-Fry]

Okay, it's not a tree. Because multiple objects will depend on something like a logger. But it's an acyclic graph if designed properly. Which is incredibly simple to setup and teardown.

If your loggers are needed everywhere, then you just pass them as a constructor to the objects that need them. You're literally doing this with fx anyway.

Like, a logger is probably the first thing you new up in main(). So now you can pass it down as a dependency in constructors.

For shutdown you just defer your shutdown functions. Have a basic interface where your services have a Shutdown() method and then you can push them onto a stack and pop them off during shutdown.

There's no manual ordering involved. Your initialisation is a linear top down process, your shutdown is bottom up. It can't be any simpler. If you keep code as close to usage sites then there's only 1 possible order.

[jupp0r]

I agree with you on all of this. fx is not doing much more for shutdown than what you describe (calling a handler pushed to a stack created during initialization). Instead of implementing this for every app, I just prefer to use a library with great documentation and tests.