From: viking@... (Eugene Zaikonnikov)
Date: 2002-10-16T22:43:05+09:00
Subject: Hooking on method invocation

Hello,

Is there a way to hook on invocation of *any* instance method of an
object?

My first attempt was to override the send method:

class Foo
    #just ban them
    def send(symbol, *args)
	puts "blocked"
    end
end

It works when I do:

foo = Foo.new
foo.send :something

But it has no effect on "conventional" method invocations. It seems
that send is not a part of the built-in method dispatch procedure.

I want such functionality to implement 'write barriers' for certain
objects. The idea was to track invocation of writer methods and notify
object's observer of changes. If this is achievable by other means,
any hints will be greatly appreciated.

--
  Eugene