> Hi,
>
> No problem. What I originally said was if you have many
> different types of
> entity beans, and use session beans that work on them (common
> model-controller pattern), your session bean functions will
> look something
> like this:
>
> public class TravelAgentBean
> extends SessionBean
> {
> //this is what a function looks like if you use
> generic wrapper PKs
> public void processTransaction(Integer aCustomerPK, Integer
> aItineraryPK, Integer aCreditCardPK, Integer aAddressPK...);
>
> //this is what a function looks like if you use
> custom class PKs
> public void processTransaction(CustomerPK
> aCustomerPK, ItineraryPK
> aItineraryPK, CreditCardPK aCreditCardPK, AddressPK aAddressPK...);
> }
I always use
public void processTransaction(Customer c, Itinerary i, etc.)
so as to hide the PKs from the client. Likewise, I hide all EJBHome calls in
the bean implementation, so that clients only have to pick up a single home
and can traverse the persistent object graph using only the remote
interfaces.
>
> Now do you see the problem? The first function is not
> typesafe at all!
> Sure, the arg names clearly label what the user should pass in, but
> developer of this bean is basically counting on the
> competency of the user
> to pass in the correct corresponding PK values without any
> compile-time
> checks! Should a user make a mistake and swap two arguments,
> where will
> this be caught? Chances are, it probably won't, and someone
> else will be
> footing the bill for another's free vacation! Debugging can
> be a nightmare!
>
> The moral of this is: sure, custom PKs require a little more
> effort (not
> really much more... just have a custom classes that wrap Integers or
> Longs!), but you will appretiate your efforts in the long run!
>
> Gene
- Avi
--
s/\be(\w+)/e-\1/g;
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