[cdi-dev] Getting injection point from Bean#create

[Tomas Remes]

Hi Arjan,

Ok I am going to check this. Wrt TCK I am not sure it's suitable to some spec assertion so I wouldn't add it to TCK but we can definitely include this to Weld internal testsuite. 

Thank's

Tom

----- Original Message -----
From: "arjan tijms" <arjan.tijms at gmail.com>
To: "Jozef Hartinger" <jharting at redhat.com>
Cc: cdi-dev at lists.jboss.org
Sent: Wednesday, January 27, 2016 2:42:00 PM
Subject: Re: [cdi-dev] Getting injection point from Bean#create

Hi 

On Thu, Nov 20, 2014 at 9:42 PM, Jozef Hartinger < jharting at redhat.com > wrote: 


The simplest thing you can do is: 

Bean<InjectionPoint> bean = (Bean<InjectionPoint>) manager.resolve(manager.getBeans(InjectionPoint.class)); 
InjectionPoint ip = (InjectionPoint) manager.getReference(bean, InjectionPoint.class, manager.createCreationalContext(bean)); 

I just tried this again, and unfortunately it now fails on Weld. 

I quickly tried a series of Weld versions and this is the result: 

Weld 
2.2.6 works 
2.2.8 works 
2.2.9 fails 
2.2.13 fails 
2.2.14 fails 
2.2.16 fails 
2.3.0 fails 
2.3.2 fails 

So apparently it broke between 2.2.8 and 2.2.9. 

Would it be possible to add a TCK test for this? This would be really helpful as we'd like to use this for the JSF 2.3 RI. 

Kind regards, 
Arjan Tijms 










On 11/19/2014 05:06 PM, arjan tijms wrote: 



Hi, 

In a producer method it's trivial to get access to an InjectionPoint 
instance representing the point where the value produced by the 
producer will be injected. 

When registering a Bean manually from an extension using 
AfterBeanDiscovery#addBean, this is not immediately obvious. 

After some fumbling with the CDI APIs I came up with the following 
code that seems to work on both Weld and OWB (didn't test CanDI yet). 

It uses a small "dummy" class, which is used to grab an InjectionPoint off: 

In a Bean: 

public Object create(CreationalContext<Object> creationalContext) { 

InjectionPoint injectionPoint = (InjectionPoint) 
beanManager.getInjectableReference( 
resolve(beanManager, 
InjectionPointGenerator.class).getInjectionPoints().iterator().next(), 
creationalContext 
); 

With InjectionPointGenerator being the following class: 

public class InjectionPointGenerator { 
@Inject 
private InjectionPoint injectionPoint; 
} 

And resolve being the following method: 

public static <T> Bean<T> resolve(BeanManager beanManager, Class<T> beanClass) { 
Set<Bean<?>> beans = beanManager.getBeans(beanClass); 

for (Bean<?> bean : beans) { 
if (bean.getBeanClass() == beanClass) { 
return (Bean<T>) 
beanManager.resolve(Collections.<Bean<?>>singleton(bean)); 
} 
} 

return (Bean<T>) beanManager.resolve(beans); 
} 

As mentioned, while this seems to work, I wonder if it's the best approach. 

Kind regards, 
Arjan 
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