Dynamic Proxy using Scalas new Dynamic Type

Question

Is it possible to create an AOP like interceptor using Scalas new Dynamic Type feature? For example: Would it be possible to create a generic stopwatch interceptor that could be mixed in with arbitrary types to profile my code? Or would I still have to use AspectJ?

Answer 1

I'm pretty sure Dynamic is only used when the object you're selecting on doesn't already have what you're selecting:

From the nightly scaladoc:

Instances x of this trait allow calls x.meth(args) for arbitrary method names meth and argument lists args. If a call is not natively supported by x, it is rewritten to x.invokeDynamic("meth", args)

Note that since the documentation was written, the method has been renamed applyDynamic.

Answer 2

No.

In order for a dynamic object to be supplied as a parameter, it'll need to have the expected type - which means inheriting from the class you want to proxy, or from the appropriate superclass / interface.

As soon as you do this, it'll have the relevant methods statically provided, so applyDynamic would never be considered.