[markuz]

I was thinking the same thing. It has nothing to do with callbacks.

> fully resolving circular dependencies is equivalent to solving the halting problem, IIRC.

I don't think so. Any good dependency injection framework would detect this kind of circular dependency.

[groby_b]

Of logger and DB, certainly. The coupling introduced via locks is harder to detect. But most importantly, circular dependency between components might be OK in a path-dependent way - that's what I meant by fully resolving it.

Just analyzing the dependency graph of injected components is indeed just a topological sort.