Stefan Seifert created SLING-3718:
-------------------------------------
Summary: Sling Models: Add self Injector for supporting chains of
object injecting dependencies from a common source
Key: SLING-3718
URL: https://issues.apache.org/jira/browse/SLING-3718
Project: Sling
Issue Type: Improvement
Components: Extensions
Reporter: Stefan Seifert
Priority: Minor
as discussed in my post on the sling mailing list
http://mail-archives.apache.org/mod_mbox/sling-dev/201406.mbox/%3c580afa6c6dab8a4196956da5ee17c8ca8f7619e...@feanor.pro-vision.de%3E
it would be very helpful to have a "self-adapting" injector to support chains
of objects (e.g. controller classes depending on business classes) that all can
adapt themselves from a common source, e.g. a SlingHttpServletRequest or a
ResourceResolver.
souch an injector can be simple like this:
{code:java}
@Component
@Service
@Property(name = Constants.SERVICE_RANKING, intValue = 50)
public class SelfAdaptInjector implements Injector {
public String getName() {
return "selfadapt";
}
public Object getValue(Object pAdaptable, String pName, Type pType,
AnnotatedElement pElement,
DisposalCallbackRegistry pCallbackRegistry) {
if (!(pType instanceof Class)) {
return null;
}
if (!(pAdaptable instanceof Adaptable)) {
return null;
}
return ((Adaptable)pAdaptable).adaptTo((Class<?>)pType);
}
}
{code}
comment from Justin on this in the mailing list:
{quote}
The self injector is interesting. I held off on that initially because
it seems too easy to create a circular injection. Any thoughts on how
that can be avoided?
\[...\]
Regards,
Justin
{quote}
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