you likely want a standalone AOP solution like AspectJ

# kapt

[jw]

you likely want a standalone AOP solution like AspectJ

[Joe]

Ok, am I right in thinking annotation processors can create new classes, but not modify existing ones? so another option could be to generated Timed$class and use that everywhere? but probably an AOP solution is what I'll end up doing

[bdawg.io]

annotation processors can create new classes, but not modify existing ones

correct

[shane]

Maybe you could use ByteBuddy, and have a custom Guice binder that wraps all your dependencies with a dynamic proxy version

https://bytebuddy.net/#/

Hibernate uses ByteBuddy to generate DB entity proxy subclasses that can lazy load joins with SQL

Your dependency classes could get bound to a provider that generates the proxy subclass with hooks that record metrics.

You might need open classes + protected methods for this to work tho. You could use the all open plugin and sed s/private fun/protected fun/g.