[weld-dev] Interceptors

[Jozef Hartinger]

On 05/11/2015 03:47 PM, Emily Jiang wrote:
>
> I have a few questions on interceptors:
>
> 1. CDI Interceptors on cdi beans
> Will the interceptors share the same creational context as the bean it 
> is associated with?
Yes. It is not the very same creational context but a new one with a 
parent-child relationship to the one of the associated bean. This is the 
same as for @Dependent dependencies
> Will Weld managed the cdi interceptors as well as the old-styled 
> interceptors?
Yes, Weld manages interceptor bindings associated using interceptor 
bindings as well as those associated using @Interceptors
> @Interceptors don't work on other cdi beans except ejb and managed 
> beans, right?
"Managed bean" is ambiguous. Weld support interceptors on all CDI 
managed beans (not on producer fields/methods nor extension-provided beans).
>
> 2. Interceptors on ejb beans or managed beans
> I think the integrator needs to create these @Interceptors and cdi 
> interceptors.
Yes, for EJBs and EE managed beans it is integrator's job to handle 
those. Weld can handle @AroundConstruct interceptors if needed. I've 
updated the docs on this topic recently: 
https://github.com/jharting/core/blob/a1eb6194be36ded86dc9709c6767f5016fb98997/docs/reference/src/main/asciidoc/ri-spi.asciidoc#around-construct-interception
> Will these interceptors use the non-contextual creational context 
> (scope @Dependent) or use the ejb or managed bean's creational context?
ejb or managed bean's creational context
>
> Will Weld destroy the interceptors when the associated beans are 
> destroyed or the integrator need to destroy them? This logic 
> applicable to both cdi interceptors and @Interceptors style 
> interceptors, right?
Any time the parent (bean's) creational context is destroyed, the 
children creational contexts (interceptors') are destroyed also by Weld.
>
> 3. Interceptors on JavaEE components
> I think this interceptors are created by Weld when the JavaEE 
> component classes are created, right? By the way, how can the 
> container make sure to destroy the interceptors?
This depends on how the component classes are managed. Assuming the 
components are managed using Weld-provided InjectionTarget then it is up 
to the integrator to decide whether it provides interception support or 
whether it should be provided by Weld. This can be configured for each 
InjectionTarget individually using this builder: 
http://docs.jboss.org/weld/javadoc/2.2/weld-spi/org/jboss/weld/manager/api/WeldInjectionTargetBuilder.html
>
>
> -- 
> Thanks
> Emily
> =================
> Emily Jiang
> ejiang at apache.org <mailto:ejiang at apache.org>
>
>
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