Issue 258: [Patch] custom annotation based injection points
http://code.google.com/p/google-guice/issues/detail?id=258
New issue report by james.strachan:
There are lots of standards and frameworks which define their own custom
injection points.
Here's a few off the top of my head; I'm sure there's many more out there...
JSR 250 & EJB3 defines @Resouce for injecting objects from JNDI
JPA defines @PersistenceContext for injecting JPA resources usually
prebound to a transaction
context etc
JAX-RS defines a number of them such as @PathParam, @HeaderParam, @Context
etc
WebBeans defines @In
Stripes defines @SpringBean
Apache Camel defines @EndpointInject and @Produces
This patch makes it easy to implement these custom injection points in
frameworks as follows;
this example supports @Resource from JSR 250
{{{
@InjectionAnnotation(Resource.class)
public class ResourceProviderFactory<T> implements
AnnotationProviderFactory<T> {
private final Context context;
@Inject
public ResourceProviderFactory(Context context) {
this.context = context;
}
public Provider<T> createProvider(AnnotatedElement member) {
Resource resource = member.getAnnotation(Resource.class);
Objects.nonNull(resource, "@Resource is missing!");
String name = getJndiName(resource, member);
return new Provider<T>() {...}
}
}}}}
Rather than going into a long discussion in this issue, I'll bring it up on
the mailing list and post
a link here shortly...
Note that this patch also includes these patches...
http://code.google.com/p/google-guice/issues/detail?id=62
http://code.google.com/p/google-guice/issues/detail?id=78
given the amount of code I've changed for these 3 patches its been a bit
tricky separating them
out into different patches.
Mostly this patch involves changes to InjectionPoint and InjectorImpl along
with the new interface AnnotationProviderFactory and annotation
InjectionAnnotation along with a new test case in the
jsr250 module called ResourceTest that tests out the injection of @Resource
for field and
method injection
Attachments:
custom_annotation_injections.patch 121 KB
Issue attributes:
Status: New
Owner: ----
Labels: Type-Defect Priority-Medium
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