Re: [Springframework-developer] Re: Creating Application Context getBean 'closures'

[Colin S. <col...@ex...>]

Chris Nokleberg wrote:

>Colin Sampaleanu wrote:
>  
>
>>I think I may be missing something, but I think it's desireable to be
>>able to create in an easy fashion, 'closures' which encapsulate getting
>>a bean from a bean factory.
>>
>>Say you have an interface
>>  interface MyInteface {   ... whatever }
>>
>>and you have a factory Interface
>>  interface MyInterfaceFactory {
>>    MyInterface getInstance();
>>  }
>>    
>>
>
>You may want to look at:
>http://cglib.sourceforge.net/apidocs/net/sf/cglib/reflect/MethodDelegate.html
>
>It can create an object that implements an interface but delegates the
>implementation to a virtual or static method (with matching signature) of
>your choice. Essentially it is a implementation of C# delegates for Java.
>  
>
Thanks Chris. I don't think though this provides any fundamental 
advantage over just using AdvisedSupport in Spring as used by 
ProxyFactoryBean. The fact that it only delegates to a method with a 
matching signature is a problem too (unless I'm missing something). The 
code would have to delegate to a method with an Object return value, 
with the proxy doing something like a ClassCastException if the return 
value (at runtime) didn't match.