[seam-dev] @Unwrap implementation in weld-extensions

[Stuart Douglas]

I don't think I will be able to implement the injection of InjectionPoint into the producer method, but other than that it should be possible to implement.

Stuart


On 20/04/2010, at 8:15 PM, Pete Muir wrote:

> Yes, I agree. I had raised this issue during spec development - that there was no truly stateless scope in CDI, where the bean instance was created every time.
> 
> I would like to hear from the 299 EG about this as well.
> 
> On 20 Apr 2010, at 04:57, Stuart Douglas wrote:
> 
>> I think that there is a real use case for something similar to the @Unwrap feature of seam 2.
>> 
>> I think that it would be possible to implement something like this:
>> 
>> @ConversationScoped
>> public class ManagedPersistenceContext
>> {
>> 
>> EntityManager entityManager;
>> 
>> @Unwrap
>> @SomeQualifier
>> public EntityManager produce(InjectionPoint injectionPoint)
>> {
>>   entityManager.joinTransaction();
>>   return entityManager;
>> }
>> }
>> 
>> public class MyClass
>> {
>> @Inject @SomeQualifier EntityManager entityManager;
>> }
>> 
>> the way I envisage this working is that a proxy gets injected into MyClass, and this proxy calls ManagedPersistenceContext.produce to resolve the correct EntityManager to pass the call to every time a method is invoked on the proxy.
>> 
>> I am pretty sure I can implement this in weld-extensions using JDK proxies, does this sound like a good idea?
>> 
>> Stuart
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>