{LightwireFramework} Re: Handling circular dependencies. - Lightwire Framework

Message from discussion {LightwireFramework} Re: Handling circular dependencies.

Paul Marcotte

More options Feb 9, 9:47 pm

From: "Paul Marcotte" <pmarco...@gmail.com>

Date: Sat, 9 Feb 2008 18:47:35 -0800

Local: Sat, Feb 9 2008 9:47 pm

Subject: Re: {LightwireFramework} Re: Handling circular dependencies.

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Hi LT,

My pleasure. To give you a bit more information, you can use a superset of
ColdSpring xml definitions with Lightwire. The difference is that since
Lightwire supports mixin injection, there is a <mixin/> tag. What mixin
give you is the ability to reference the dependency as
variables.MyMixinwithout having to add a specific setter for
"MyMixin".

But that's where it stops. You won't find AOP, Autowiring, or remote
proxies with LightWire.

Regarding the circular dependency, I just wanted to mention that many of the
community leaders like Sean Corfield and Brian Kotek suggest that having a
1:1 ration of Services to business objects can cause issues like circular
dependencies. Quick example. Say you have a ProductService and and
CategoryService for your online catalog. If you have a circular dependency
between the two, you might consider rolling them up into a CatalogService
that provides API methods Products and Categories. This is a application
design paradigm that I'm currently working toward.

So, uh, that's my 2 cents...

Cheers,

Paul

On Feb 9, 2008 12:33 PM, lagos.tout <lagos.t...@gmail.com> wrote:

> Hi, Paul.

> Thanks for responding.
> I was just curious for comparison sake with ColdSpring.
> I guess I haven't figured out when to use CS over LW, or vice-versa.
> Of course, for AOP I'd have no choice but CS. But for the things they do
> have in common... ?
> Thanks.

> LT

> ----- Original Message ----
> From: Paul Marcotte <pmarco...@gmail.com>
> To: lightwireFramework@googlegroups.com
> Sent: Thursday, February 7, 2008 3:43:58 PM
> Subject: {LightwireFramework} Re: Handling circular dependencies.

> Hey LT,

> You can use "mixin" injection in Lightwire rather than "setter"
> injection. In ColdSpring the way around a circular dependency is to use a
> property tag instead of a constructor-arg. Lightwire has both constructor
> and setter injection and the aforementioned mixin injection.

> I caught your post on the ColdSpring list as well, so I'm curious about
> you object dependencies. Do you mind sharing some information about the
> dependent objects?

> Paul

> On Feb 7, 2008 3:31 PM, LT <lagos.t...@gmail.com> wrote:

> > Hi,

> > I was wondering if Lightwire handles circular dependencies in a
> > different way from ColdSpring.
> > Thanks.

> > LT.

--
Paul Marcotte
Fancy Bread - in the heart or in the head?
http://www.fancybread.com

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