method.rb

class A
  instance_methods.each do |m|
    undef_method m unless m.to_s =~ /^__|object_id|method_missing|respond_to?/
  end

  def initialize(o)
    @o = o
  end

  def method_missing(name, *args)
    super if !respond_to?(name)
    @o.send("get_#{name}_info", args[0])
  end
  
  def respond_to?(method)
    @o.respond_to?("get_#{method}_info") || super
  end

end

class B
  def get_foo_info(id)
    p "#{__method__}: #{id}"
  end

  def get_bar_info(id)
    p "#{__method__}: #{id}"
  end
end

obj = A.new(B.new)
obj.foo(100) # => "get_foo_info: 100" 
obj.bar(100) # => "get_bar_info: 100" 
obj.baz(100) # => `method_missing': undefined method `baz' for #<A:0x00000013eac550> (NoMethodError)