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So,
The TO can be viewed as a security layer,
preventing the business logic to be accessed from outside ?
Is this the only reason of TO existence
?
[]s
----- Original Message -----
Sent: Thursday, January 06, 2005 6:11
PM
Subject: Re: [CFCDev] Transfer
Objects
Your TO is a snapshot of the state contained within your
business
object (BO), which is what you're calling a bean. So if you
have a BO
that you need to display in your view, persist to the database,
or
whatever, you'd ask the BO for a TO containing it's state, and
then
the view or persistance layer would use the getters on the TO to
do
whatever it needs to do.
The reason you don't want to pass the
full BO into your view or
persistance layer is that it exposes the
potential for business
methods to be called on your BO outside the business
logic layer. By
using a TO, you avoid that, because there aren't any
business methods
on the object that is being passed out of the business
logic layer.
cheers,
barneyb
On Thu, 6 Jan 2005 13:46:11
-0600, Dawson, Michael <[EMAIL PROTECTED]> wrote:
>
>>I would generally expect TOs to be effectively read only - an
init()
> method and getters (but no setters). I'd be suspicious of code
that
> wanted to create a fully populated TO and then mess with its
data...
>
> I think I'm getting more and more confused with the
difference between
> beans and transfer objects.
>
> I have
a CFC, which I call a bean (maybe I'm wrong), that has setters
> and
getters and validation logic. This is the one where all the
setters
> are string data types.
>
> Are you saying that
once I have the bean fully-populated, I should then
> pass that into a
transfer object as a whole, where the transfer object
> then *only*
returns data that was passed to it?
>
> If so, am I wrong in
passing a bean directly into a DAO? Such as:
>
> Good: Bean
--> Transfer Object --> Data Access Object
> Evil: Bean -->
Data Access Object
>
> Maybe I'm just confused on
terminology.
>
> Thanks
> MAD
--
Barney
Boisvert
[EMAIL PROTECTED]
360.319.6145
http://www.barneyb.com/
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have 9
invites.
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