I'm migrating CXF REST endpoints from blueprint to Declarative Services that runs on Apache Karaf. I use Aries RSA and DOSGI. In the old code ContainerRequestFilter is used (specified in blueprint), but I am not sure how it can be used with DS? From [0] I can see that javax.servlet.Filter can be registered and I wonder what is the right approach. Is it possible to register ContainerRequestFilter by using DS annotations?
1 Answers
This is now possible using the JAX-RS Whiteboard from OSGi R7. Registering a JAX-RS extension is as simple as making it an OSGi service providing the relevant service interface(s) - in this case ContainerRequestFilter and adding the service property "osgi.jaxrs.extension=true".
By also using R7 features from Declarative Services and bnd 4.0.0 this service property can be applied to Declarative Services components using the new ComponentPropertyType meta-annotations. A standard annotation @JaxrsExtension is part of the JAX-RS whiteboard specification.
For example:
@JaxrsResource
@Component
public class MyRequestFilter implements ContainerRequestFilter {
// Implementation goes in here
}
The OSGi enRoute project provides other examples of using the JAX-RS whiteboard in its examples
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