Hello,
this question is not _directly_ castle related, more to the general topic of
entities, services and ioc. I hope that is not a problem.
I have the classes Order, Cart and a service CartToOrderCoversion.
When the user places an Order, he will give a Cart to the
CartToOrderCoversion.Execute(cart) and gets an Order in return.
During this step I currently inject a list of IOrderRules into the service
via IoC. These rules can do things like:
- if the order total is more than 300.00 you will get a discount of 10 or
a gift. Or
- if your items are of certain type, you will get another item for free
etc...
These IOrderRules are configurable via regular Windsor xml more or less like
this
<component type="Rules.BuySpecialItemGetGiftRule"
service="IOrderRule">
<parameters>
<mode>Rules.RuleModes.Always</mode>
<description>If you buy an item that fulfills a very
complicated condition the user gets an item with the id
beyond.</description>
<externalmessage>promo bla bla</externalmessage>
<internalMessage>Rule BuySpecialItemGetGiftRule added 1 {0}
to the order because {1} fulfills the complicated
condition.</internalMessage>
<giftArticleId>1546</giftArticleId>
</parameters>
</component>
xBuySpecialItemGetGiftRule also gets injected an IArticleDao to get to the
article of the id, which it would then add to the order, another IDao to
check the condition (both in the .ctor) and an ILogger (setter) because we
want to know whats going on.
This is not very comfortable and flexible in terms of administration (needs
app restart on changes, manual xml editing by business people).
So on one hand I would prefer these rules to be normal (nhibernate
persisted) entities in the db and directly hold references to entities
(instead of ids), which would also help with data integrity. This would help
me get rid of some of the services.
On the other hand sometimes the conditions they have to check are so
complicated, that only a direct query with a service can resolve it. So I
would need to pass in these services (probably via an interceptor), but I
have a feeling, that a business object should not have any knowledge of
services.
What do you think? Is my model already good? How would _you_ do that?
--
Jan
___________________
[EMAIL PROTECTED]
www.limpens.com
+55 (11) 3082-1087
+55 (11) 3097-8339
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Castle Project Users" group.
To post to this group, send email to [email protected]
To unsubscribe from this group, send email to [EMAIL PROTECTED]
For more options, visit this group at
http://groups.google.com/group/castle-project-users?hl=en
-~----------~----~----~----~------~----~------~--~---
