Reflection or DynamicMethod?

Question

I have used NHibernbate in few projects and now learned about few more ORMs also. I understand that, NHibernate binds Class to Datalayer dynamically during runtime using the mapping file.

My Question is , how this late binding is done ? I mean, which Methodology is used, 'Reflection' or 'DynamicMethod' ?

In case, if it uses Reflection, Is there any ORM which uses DynamicMethod? and provides better performance ?

score 3 · Accepted Answer · answered Mar 05 '09 at 11:44

As of NHibernate 2.1, the proxy factory is pluggable. Here are some proxy providers supported:

Castle.DynamicProxy
LinFu
Spring.NET

So proxying will be actually out of NHibernate's responsibility, and the answer to this question really depends on the selected proxy factory.

score 2 · Answer 2 · answered Mar 04 '09 at 11:38

2

NHibernate uses Castle.DynamicProxy, which under the hood uses DynamicMethods.

answered Mar 04 '09 at 11:38

jonnii

28,019
8
80
108

even if you specify your class as 'lazy' ? – Frederik Gheysels Mar 04 '09 at 13:01
@Frederik: 'lazy' is what tells NHibernate to proxy the entity with Castle.DynamicProxy. Otherwise it's not proxied. – Mauricio Scheffer Mar 05 '09 at 11:25
IIRC nhibernate makes classes lazy by default. – jonnii Mar 05 '09 at 12:48
@jonnii: yep, unless you define it otherwise (default-lazy="false" or lazy="false") – Mauricio Scheffer Mar 05 '09 at 23:01

score 0 · Answer 3 · answered Mar 04 '09 at 12:43

0

Exactly how an ORM instantiates entities is not a good way to assess its overall performance.

answered Mar 04 '09 at 12:43

James L

16,456
10
53
70

@dario-g no just like to keep a close eye on my ORM – James L Sep 21 '10 at 14:55

Reflection or DynamicMethod?

3 Answers3