I'm going round in
circles on this.
One the one hand it
seems attractive to put transformation, validation and calculation code into
beans. Now they are (at least somewhat) smart.
-
MyUser.setPhoneNumber() can now regex to remove non-integers and can return
whether the phone number was valid or not (or that could be broken out).
- MyUser.getAge()
can calculate the age based on VARIABLES.DateofBirth.
But then I ask, what
happens when I want to display a list of records on the page
and I want to include perhaps a users age that is calculated from
UserDateofBirth? Well, unless I want to duplicate my calculation code, I'll have
to create a collection of objects (or loop through a recordset loading into and
saving out from an object which may be more performant but would be a bit bug
eyed and weird) just to display my 100 records on the page. Similarly, if I want
to import 100 records, to transform successfully I'd have to either create 100
objects or load and unload an object 100 times.
Firstly, is anyone
out there using a load/unload single object kind of pattern to make these kinds
of systems more performant (as opposed to a less radical example of object
pooling such as some of what Sean did in Reactor)?
Secondly, what not
just go back to a service object (e.g. UserService) operating on recordsets,
using DAO and Gateway to abstract database access and if necessary an abstract
factory for calling them if you want to support n-data sources. How does putting
validation, transformation and/or calculation code in a bean (one object) as
opposed to its service (another object) better in terms of maintainability? I'm
sure there is a good answer to this, but I can't quite grasp it . . .
!
Best
Wishes,
Peter
Peter
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