Re: [Springframework-developer] Prototype handling support

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

Colin

I think my solution is the strategic one, as I wanted to avoid any
dependency on Spring in such cases. Can you work with yours in your own
patch until we can build in the better way?

Rgds
Rod

----- Original Message -----
From: "Colin Sampaleanu" <col...@ex...>
To: <spr...@li...>
Sent: Tuesday, May 11, 2004 5:05 PM
Subject: Re: [Springframework-developer] Prototype handling support


> Rod,
>
> I am almost done a much simpler interimn (aka not as good) solution,
> which is a FactoryBeanCreatingFactoryBean.
>
> It is simply a FactoryBean which produces a FactoryBean which will then
> be used for accessing a prototype. So you have the current definition.
>
>     <bean id="prototype" class="a.b.c.D" singleton="false">
>       ...
>     </bean>
>     <bean id="myX" class="a.b.c.XXX">
>       ...
>     </bean>
>
> and the current java code
>
> class XXX implements BeanFactoryAware {
>     BeanFactory _bf;
>     void setBeanFactory(BeanFactory beanFactory) throws BeansException
> {  ...  };
>
>     ... in some method
>     D dInstance = _bf.getBean("prototype");
>     ...
> }
>
> This would become:
>
>     <bean id="prototypeTarget" class="a.b.c.D" singleton="false">
>       ...
>     </bean>
>     <bean id="prototype"
>
class="org.springframework.beans.factory.config.FactoryBeanCreatingFactoryBe
an">
>
>       <property name="targetName"><idref
> local="prototypeTarget"/></property>
>     </bean>
>     <bean id="myX" class="a.b.c.XXX">
>       <property name="prototypeFactory"><ref
local="prototype"/></property>
>     </bean>
>
> with the Java code:
>
> class XXX  {
>     FactoryBean _prototypeFactory;
>     void setPrototypeFactory(FactoryBean factoryBean) {  ...  };
>
>     ... in some method
>     D dInstance = (D) _prototypeFactory.getObject();;
>     ...
> }
>
> Now is the second form better? Personally I think so; there is still a
> tie to Spring of course (FactoryBean), but at least it's not
> BeanFactoryAware, and the client can only get at one bean, not _any_
> bean in the BeanFactory. It would be a lot simpler of course if the
> container itself could create the FactoryBean on the fly as part of the
> property setting.
>
> Your solution is much nicer of course. I would be interested in using
> and polishing up your code, but I can't do it myself either until about
> 1.5 to 2 weeks from now. We have a situation with an app running on "the
> most popular open-source EJB server" which has become intolerable due to
> unreliability in the face of increased usage, and I need to work to move
> my current CVS code to production next week.
>
> Colin
>
>
> Rod Johnson wrote:
>
> >Colin
> >
> >When it gets into Spring depends on when I have time to
> >polish it. Basically that means some time in June. It
> >basically works and it's _very_ useful. (I keep thinking of
> >cool things to use it for: I kept boring Juergen and Alef
> >about it on Sunday morning :-) It also needs discussion with
> >at least Juergen about the extensions to the DTD. (100%
> >backward compatible, of course.) And to accommodate the
> >upcoming AspectJ integration in 1.0.3 (new feature but again
> >very useful!) it needs to be implemented in a slightly
> >different, more open way.
> >
> >If you want to take responsibility for completing it, in
> >conjunction with myself and Juergen to discuss how the slight
> >enhancements to the core IoC stuff should work, that would be
> >great! I could send you the code and tests today.
> >
> >That way we will get it for 1.0.3, which would also be great.
> >Of course if you're on HEAD you could be using it by the end
> >of the week... As I said, it already works.
> >
> >Rgds,
> >Rod
> >---- Original message ----
> >
> >
> >>Date: Tue, 11 May 2004 09:05:59 -0400
> >>From: Colin Sampaleanu <col...@ex...>
> >>Subject: [Springframework-developer] Prototype handling
> >>
> >>
> >support
> >
> >
> >>To: spr...@li...
> >>
> >>Rod,
> >>
> >>At the TSS Symposium you mentioned having done some code to
> >>
> >>
> >allow the
> >
> >
> >>appcontext to dynamically modify a class so that a create or
> >>
> >>
> >getter
> >
> >
> >>method within it could actualy be hooked up to a prototype
> >>
> >>
> >bean within
> >
> >
> >>the factory. What are your thoughts on adding this code in
> >>
> >>
> >at this time?
> >
> >
> >>It would actually be of use to me...
> >>
> >>Colin
> >>
> >>
> >>
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> >
> >
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> >>
> >developer
> >
> >
>
>
>
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