[jira] Commented: (IBATIS-50) Ability to override the default bean creation mechanism

["Chris Mathrusse (JIRA)" <ib...@incubator.apache.org>]

    [ http://issues.apache.org/jira/browse/IBATIS-50?page=comments#action_12372015 ] 

Chris Mathrusse commented on IBATIS-50:
---------------------------------------

I don't want to bog down this discussion pertaining to whether or not this is a good idea. The reality is that it would be a nice to have and would solve a great many problems. I would like to be able to control how my POJO's are instantiated as I would like to have Spring manage my beans for me. This would give me the ability to, for example, have interceptors for each of my POJO's.  Currently I am unable to do anything other than allow my Doa layer to handle some of the complexities that I want to implement. While this solution works for most of my problems it fails to address some of my more complex issues.



> Ability to override the default bean creation mechanism
> -------------------------------------------------------
>
>          Key: IBATIS-50
>          URL: http://issues.apache.org/jira/browse/IBATIS-50
>      Project: iBatis for Java
>         Type: Wish
>   Components: SQL Maps
>     Versions: 2.0.9
>     Reporter: Philippe Laflamme

>
> Currently, iBatis is responsible for creating instances of classes used in result maps. It relies on the assumption that objects can be obtained using the Class.newInstance() method (or something equivalent).
> The assumption forces users of the framework to create classes with a no-arg default constructor. IMHO, this also has the effect of favoring implementation inheritance (extends) over interface inheritance.
> Although this is not a problem in most cases, the ability to plug in an external instance factory would provide more flexibility and favor good programming practices. Amongst other things, it would provide developers the ability write code in terms of interface.
> A simple solution is to provide an extension point where resultMap class instances are obtained from.
> The simplest form would be:
> public interface InstanceFactory {
>   Object createInstance(Class resultMapClass);
> }
> The default implementation would do something along the lines of:
> [...]
> return resultMapClass.newInstance();
> [...]
> Developers could configure iBatis to either use the default implementation or their own custom implementation. The setting could be part of the sqlMapConfig file or even per resultMap.

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