Given an existing object "obj", wraps all of its methods. In this case, the wrapper prints a log of the method invocation, and the call stack of the call, but you can modify it to do anything...
virtual_class = class <<obj; self; end virtual_class.class_eval { obj.methods.each { |method| the_alias = method.gsub(/([^?]+)(\??)/, "\\1_orig\\2").to_sym alias_method the_alias, method define_method(method) { |*args| args_str = args.map { |a| a.inspect }.join(", ") unless method == "to_s" puts "#{self.inspect_orig}.#{method}(#{args_str}) called from #{caller.inspect}" end self.send_orig(the_alias, *args) } } }
