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From "Sergey Beryozkin" <sbery...@progress.com>
Subject Re: JAX-RS Request Matching Wierdness
Date Mon, 13 Jul 2009 12:22:08 GMT
No problems - I've misread that part of the specification for a number of times :-)

The spec allows for Objects or interfaces with no JAX-RS annotations classes be returned as
subresources so what you suggest will 
not work. That said it is something I'll keep in mind. In CXF you can set an 'enableStaticResoultion'
property on a given endpoint 
and it will result in a complete traversal at startup. So may be we can indeed optimize and
possibly extend the selection 
algorithm...

cheers, Sergey

----- Original Message ----- 
From: "Tong, Gary" <Gary.Tong@morganstanley.com>
To: <dev@cxf.apache.org>
Sent: Monday, July 13, 2009 12:09 PM
Subject: RE: JAX-RS Request Matching Wierdness


Ah nevermind.  Just read the spec again and I realized that I had misread it the first time
and that CXF works as the spec says.

To be honest though, after reading the JSR the right way, the algorithm it talks about actually
seems a bit less functional than it
could be.  I would think that a initial scan of all root resource classes at startup and putting
all valid resource/sub-resources
into a gigantic mapping, and then filtering that map for each request would be a more robust
way of doing things.

Anyway, thanks for looking into this.

-----Original Message-----
From: Sergey Beryozkin [mailto:sberyozk@progress.com]
Sent: 12 July 2009 20:20
To: dev@cxf.apache.org
Subject: RE: JAX-RS Request Matching Wierdness

Hi Gary

The thing is that JAX-RS does not allow for checking on the multiple root resource classes
- I think there was a discussion on cxf
users list about extending the selection algorithm - I don't mind if it would actually make
things simpler.

Please see few more comments prefixed with S.B below. Particularly I don't understand why
the use of subresources affects the
complexity of response objects

Thanks, Sergey

-----Original Message-----
From: Tong, Gary [mailto:Gary.Tong@morganstanley.com]
Sent: 12 July 2009 11:52
To: dev@cxf.apache.org
Subject: RE: JAX-RS Request Matching Wierdness

Hi Sergey,

The problems come up in a number of situations, all involving multiple service beans.  The
simplest case is the following:

public class AWebService {
  @GET
  @Path("/a")
  public String a() {
    return "a";
  }
}

public class BWebService {
  @GET
  @Path("/b")
  public String b() {
    return "b";
  }
}

One of the two will work, but not both.

This is of course the simplest case, but there are a number of other more concrete use cases
that cause issues.  For instance, if I
had the following URLs:

GET /user
POST /user
GET /user/search?params

And I wanted to put the CRUD ops on UserWebService but the search stuff on a SearchWebService
that uses @Path("/{type}/search") then
that wouldn't work in CXF.

> S.B :
Try

@Path("/user")
public class UserService {}

@Path("/user/")
public class SearchService {}

> S.B : - note the trailing '/' in SearchService. It might do the trick
in other cases too


Also, for instance if I had the following urls:

GET /posts
GET /user
GET /user/{id}/posts

/posts would go on PostWebService and /user would go on UserWebService, but if I wanted PostWebService
to handle /user/{id}/posts as
just a specialized version of /posts that would be tricky with CXF.  It's doable with sub-resource
locators, but then my response
objects start getting complicated.

> S.B : I'm not quite sure why the use of subresources affects the
complexity of the response objects. Can you give an example please ?

Thanks,
Gary

-----Original Message-----
From: Sergey Beryozkin [mailto:sberyozk@progress.com]
Sent: 11 July 2009 21:28
To: dev@cxf.apache.org
Subject: RE: JAX-RS Request Matching Wierdness

Hi Gary

So what is the concrete problem you're facing ?

FYI, it is the map that sorts resource classes according a number of criteria. Another thing
is that the JAX-RS selection algorithm
does not have be implemented literally the way it's documented in the spec, rather the final
result should be correct.

So let me know please what exactly is happening in your case

Thanks, Sergey

-----Original Message-----
From: Tong, Gary [mailto:Gary.Tong@morganstanley.com]
Sent: 11 July 2009 16:57
To: dev@cxf.apache.org
Subject: JAX-RS Request Matching Wierdness

Hello,

Hey guys, just fyi, CXF's jax-rs doesn't do request matching correctly.
According to JSR 311 in section 3.7.2, the jax-rs server is supposed to apply a series of
steps to determine which URL to use for
the request.
Instead, CXF applies a path filter at the class level, and then returns the first entry it
finds.  Specifically the code that does
this is in
JAXRSUtils.selectResourceClass:

        if (!candidateList.isEmpty()) {
            Map.Entry<ClassResourceInfo, MultivaluedMap<String, String>> firstEntry
=
                candidateList.entrySet().iterator().next();
            values.putAll(firstEntry.getValue());
            return firstEntry.getKey();
        }


Not sure if you guys know about this.

Cheers,
Gary

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