Hi Alessio,

sorry for the delayed response. I finally found some time to have a deeper look at this. I would like to describe my idea, so I can get feedback before starting the implementation.

To recap what I'm trying to achieve: Basically the idea is to create a SPI which allows to alter the metadata of resource classes. I came up with the following interface for such a SPI:

    public interface ResourceClassProcessor {
        ResourceClass process( ResourceClass clazz );

IMO this interface provides most flexibility. The idea is similar to what CDI provides with AnnotatedType. Implementations of the new SPI can either return the provided class (if they don't want to change it) or they can return a new instance, typically something that wraps the original class and changes only a few methods.

Integrating this SPI requires two refactorings of the existing code base, but I really think that this will improve the overall structure of the metadata handling:
With these refactorings integrating the new SPI should be easy. ResteasyProviderFactory could lookup the SPI implementations using the default provider mechanism. The processors will then be feed into the ResourceBuilder when creating it. The ResourceBuilder can then build the metadata for classes from annotations (as it is done today) and after that apply all ResourceClassProcessors before returning the ResourceClass to the other components (like the registry). This will ensure that the processors are applied consistently.

I think the two refactorings mentioned above a worth the effort because they improve the overall structure of the metadata package and provides much more flexibility in the future. And they also allow integrate the new SPI very easily.

What do you think? If you agree that the refactorings are a good thing, I will start to work on them and provide a pull request.


2017-09-27 22:25 GMT+02:00 Alessio Soldano <asoldano@redhat.com>:
Forwarding to the list :-)

---------- Forwarded message ----------
From: Alessio Soldano <asoldano@redhat.com>
Date: Wed, Sep 27, 2017 at 10:24 PM
Subject: Re: [resteasy-dev] SPI to add JAX-RS annotations dynamically
To: Christian Kaltepoth <christian@kaltepoth.de>

Hi Christian,

On Wed, Sep 27, 2017 at 9:19 PM, Christian Kaltepoth <christian@kaltepoth.de> wrote:

sorry for the delayed response. I agree that if some SPI would allow to modify the builders, it should be done before the resource is registered in the resource factory. Do you think such a SPI would be useful for others?

Probably yes, but your scenario might even be enough to justify it.

I would be happy to contribute some code if it improves portability between RESTEasy and the MVC RI.

Sure, feel free to work on that and send a PR.
Thanks for pointing me to the resteasy-cdi integration. I'll have a deeper look at it in the next days.

OK, good, I hope that can offer some idea for integrating.


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Christian Kaltepoth
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