>I'll mention it to the DevNet team.
Excellent. I'll keep an eye on the MM site.
Thanks for the help btw, that clears up alot of misconceptions I had.
-----Original Message-----
From: Sean A Corfield
To: [EMAIL PROTECTED]
Sent: 7/25/2003 8:42 PM
Subject: Re: [CFCDev] Stateful vs stateless (was: CFC Caching
On Friday, Jul 25, 2003, at 16:38 US/Pacific, Cohen, Michael wrote:
> I might be wrong, but I don't remember seeing that distinction in any
> of the
> DevNet articles. I wonder why that is.
I'll mention it to the DevNet team.
> Is it correct that <cfobject> or createObject is the only way to
> instantiate
> a stateful CFC, and that <cfinvoke> simply calls a method of a
> stateless
> CFC?
You can use cfinvoke to call methods on a stateful CFC instance too:
<cfset x = createObject("component","foo") />
<cfinvoke component="#x#" method="bar" />
<cfinvoke component="#x#" method="doo" />
After the recent discussion of 'init()' methods and having them return
"this", it's worth noting that you can use that to create new instances
via cfinvoke:
<cfinvoke component="somecfc" method="init"
returnvariable="x" />
<cfinvoke component="#x#" method="foo" />
Why? Because the first cfinvoke creates an instance of somecfc and then
invokes 'init()' on it - which returns the entire cfc (by reference -
that's what "this" effectively is).
That means the following two lines are equivalent:
<cfset x = createObject("component","foo").init() />
<cfinvoke component="foo" method="init" returnvariable="x" />
> Also, is this discussion of 'stateful' vs 'stateless' CFCs what the
> heated
> "scalability/MVC" discussion was in reference to? That 'stateful' CFCs
> require more overhead than 'stateless' ones?
Not necessarily, since both types can be cached to some extent...
> Finally, can someone provide a practical example of when 'stateful'
> CFCs
> would be particularly useful?
...how about a shopping cart CFC held in session scope? The cart
maintains a list of items in the user's cart and has operations to add
new items, adjust quantities and remove items etc.
Sean A Corfield -- http://www.corfield.org/blog/
"If you're not annoying somebody, you're not really alive."
-- Margaret Atwood
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