Re: [Springframework-developer] wiring business objects

[Rod J. <rod...@in...>]

Rajeev,

I've just committed the type of interceptor I've described,
org.springframework.aop.interceptor.PrototypeInvokerInterceptor.

This creates a new instance of the target, which should be a prototype, for
each invocation. See the test case in the /test tree for example usage.

It's purely configured in XML, and transparent to calling code. (Although it
would be important to document the assumption of a new instance each time!)

Regards,
Rod

----- Original Message ----- 
From: "Rod Johnson" <rod...@in...>
To: "Rajeev Kaul" <Ra...@cu...>;
<spr...@li...>
Sent: Sunday, October 05, 2003 9:32 AM
Subject: Re: [Springframework-developer] wiring business objects


> Interesting point. Yes, if you use the <ref> element, you'll always be
using
> the same object regardless of whether you've specified it as a singleton
or
> prototype.
>
> So you could make it a prototype and your shared handler can ask the
> WebApplicationContext (which it has a reference to and can get in a
> protected method) for an instance each time you use it:
>
> BusinessObject bOcj = (BusinessObject) getBean("whatever")
>
> This will work fine.
>
> However, it does require coding and it does break Inversion of Control
> somewhat.
>
> I've always used this solution when I have this requirement (which hasn't
> been often).
>
> One potential solution is to add to Spring a generic AOP factory that
> creates a new object before every request, yet pretends to be a plain
> object. So you could set a reference to this magic factory and you would
get
> a new instance every time you invoked it, preserving strong typing and
> simple code in your handler. This would be a new object per method call.
>
> I might prototype this if it would be helpful to you. Or you could, if you
> like. (Email me to discuss it further if you're interested.)
>
> Regards,
> Rod
>
> ----- Original Message ----- 
> From: "Rajeev Kaul" <Ra...@cu...>
> To: <spr...@li...>
> Sent: Thursday, October 02, 2003 9:06 PM
> Subject: [Springframework-developer] wiring business objects
>
>
> What is the best way to wire business objects to the web handlers?  I want
> to keep a shared instance of the handlers for my web requests.  But each
> request must work with a new instance of a business object.  If  I set a
> property for the "singleton" handler to a business objct, then won't it
> always fetch the same instance (of business object) , no matter what I
> specify for "singleton" attribute of the business object in the
application
> context?  I am thinking of using an intermediary like a business object
> factory, which will ensure that I get a new instance of the business
object
> every time, and not specify the business object in the application
context.
> Is there a better way of dealing with it in Spring?
>
>
>
> Rajeev Kaul
> Customer Care, Inc.
> 925 277 069
>
>
>
>
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