From: John Lam <drjflam@...>
Date: 2005-11-10T05:32:07+09:00
Subject: My usage of const_missing and method_missing

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I was wondering if folks with much more experience with Ruby than I could
comment on my usage of const_missing and method_missing in this code:

class ClrClass
 def method_missing(name)
 self.class.class_eval do
 define_method(name) { name.to_s } # TODO: I will dynamically create IL
shims here
 @method_count +=3D 1
 end
 self.method(name).call
 end
 def get_dotnet_type
 self.class.instance_variable_get(:@dotnet_type)
 end
 def get_method_count
 self.class.instance_variable_get(:@method_count)
 end
end

class Module
 def const_missing(name)
# TODO: I'll lookup the CLR type by prepending names that I find in the
ancestors array - I know that part works already.
 c =3D Class.new(ClrClass)
 c.instance_variable_set(:@dotnet_type, name)
 c.instance_variable_set(:@method_count, 0)
 const_set(name, c)
 end
end

The current version of my Ruby <-> CLR bridge doesn't use this technique.
I'd like to use this technique to cache all of my generated CIL shims and
CLR Type objects.

Thanks
-John
http://www.iunknown.com


PS Here are the tests that I used:

class MethodMissingTests < Test::Unit::TestCase
 def setup
 @obj =3D System.new
 end

 def test_const_missing
 assert_equal :System, @obj.get_dotnet_type
 end

 def test_method_missing
 assert_equal "joe", @obj.joe
 assert_equal 1, @obj.get_method_count
 end

 def test_method_proxy_caching
 assert_equal "joe", @obj.joe
 assert_equal "bob", @obj.bob
 assert_equal 2, @obj.get_method_count
 assert_equal "joe", @obj.joe
 assert_equal 2, @obj.get_method_count
 assert_equal "kim", @obj.kim
 assert_equal 3, @obj.get_method_count
 end
end

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