metaprogramming - Groovy - overriding invokeMethod for a single instance

Question

I have an instance of a java object, let's say an instance of ArrayList called myList.

For this particular instance, I want to override the invokeMethod method to (say) log that method was called.

I could do something like this:

myList.metaclass.invokeMethod { name, args -> 

   println "Called ${name} with ${args}"
   whatGoesHere.invokeMethod(name, args)

}

Notice the 2nd line of the closure - how can I call the original invokeMethod method? Am I going about this correctly?

Answer 1

There might be a shorter route to the original method, but this should work:

def myList = [ 1, 2, 3 ]

myList.metaClass.invokeMethod { name, args -> 
   println "Called ${name} with ${args}"
   delegate.class.metaClass.getMetaMethod( name, args )?.invoke( delegate, args )
}

myList.sum()