Excellent!  Can't wait to see what you have.  You're right that we could code to JSR 311 and use any valid implementation, but I have no problem relying upon RESTeasy, since we could leverage new features (e.g., http://bill.burkecentral.com/2008/11/10/jax-rs-atom-support-with-resteasy/), and since the RESTful service would certainly be packaged to run in a servlet container and thus shouldn't have any problems with clashes in dependencies.  Plus, RESTeasy is another JBoss technology.

I'm wondering if you meant to say a JDBC Metadata "connector" (rather than "sequencer").  If you did mean "sequencer", I'd be interested in hearing about how that might work (what might be sequenced so the sequencer knows how to establish the connection and retrieve the metadata).

Now, regarding a REST mapping.  I've looked at Sling (which has other features besides just a REST service), and based upon the documentation (which may very well be out of date), the client specifies the content type in the URL - that's not very appealing.  I would much rather see standard content negotiation via the standard accept header.  Now, the other two examples don't always look very RESTful (or at least "resource oriented").  For example, Alfresco's REST API's login method (http://wiki.alfresco.com/wiki/Repository_RESTful_API_Reference#Login) uses GET even though it's not idempotent.  POST would seem to be better here. I would love to see a more detailed discussion on the REST mapping.  Perhaps you could start off with what you've used in your prototype?

Another important topic is this: will we want to build a content-driven application framework or will we want to use Sling or Alfresco's WebScripts (or other)?  Some advantages of reusing an existing system are: 
There are probably others, too.  Some disadvantages are:

I'm a bit conflicted: I think we could do better, but just because we can doesn't mean we should.  There's something to be said about focusing on what makes DNA unique and advantageous (primarily federation and sequencing), and just using Sling or Alfresco to build out some great useable applications.  In fact, I think that a really usable and really useful content-driven rich internet application (perhaps using Flex) is another potential focus area for DNA.  

So, as long as as have a correct  and complete (enough) JCR implementation, then we (or anyone else) should be able to use DNA in combination with Sling and/or Alfresco.  We may even win over the Alfresco community, if DNA's repository implementation is better than Jackrabbit.  (Jackrabbit does a lot of things well, but there are some things it doesn't do well.  All we need to do is be better at how Alfresco uses JCR.)

Now, having said that, I think that a RESTful service is not the same as a content-driven application framework.  I think DNA should offer a lightweight, full-functioning RESTful service that doesn't depend on the larger content-driven applications.  After all, I think many embedded use cases will simply want a deployable RESTful service so that client apps can work with a remote (federated) repository.  And I think we can achieve this with very little code using RESTeasy (or maybe even other JSR-311 implementations).  So we definitely need to do this.


Best regards,

Randall

On Nov 10, 2008, at 6:04 AM, Sergey Litsenko wrote:

Hi All,
 I've already started working on (not yet in SVN - will wait till 0.3 release):
  1) JDBC Metadata sequencer (POJO model is ready, working on extraction of metadata)
  2) JAX-RS prototype. 
  IMO, we would need to start working on REST mapping for JCR resources. Basicaly, any implementation of  http://jcp.org/en/jsr/summary?id=311 may be used as a core of the REST-JCR integration (RestEasy?)
  There are at least few available implementations exists that we may review:
  1) Sling project http://incubator.apache.org/sling/site/resources.html#Resources-JCRbasedResources) 
  2) Alfresco REST API for JCR at http://wiki.alfresco.com/wiki/HTTP_API#Alfresco_RESTful_API_Reference
  3) Alfresco  Content Management Interoperability Services  (CMIS) API  http://wiki.alfresco.com/wiki/CMIS_Web_Scripts_Reference

It would be nice to see as one of future features of DNA auto-discovery (zeroconf) of some resources as well as DNA repository self advertizing (for example - http://activemq.apache.org/zeroconf.html). 

Best regards,
Sergiy
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Subject: dna-dev Digest, Vol 8, Issue 3

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Today's Topics:

  1. Preparing for the 0.3 release (Randall Hauch)
  2. JBoss DNA 0.4 planning (Randall Hauch)


----------------------------------------------------------------------

Message: 1
Date: Tue, 4 Nov 2008 12:18:59 -0600
From: Randall Hauch <rhauch@redhat.com>
Subject: [dna-dev] Preparing for the 0.3 release
To: JBoss DNA <dna-dev@lists.jboss.org>
Message-ID: <92A505A6-0D05-47BF-813B-438181005D27@redhat.com>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes

We're down to just a handful of outstanding issues targeted to 0.3,  
and all of the big fish issues were completed.  I'll be working my two  
issues over the next few days, but I should be ready for releasing as  
early as this week.  Serge has the other outstanding issues, which are  
all regarding the SVN connector.  Serge, where do we stand on this?  
Do you want more time to get some functionality finished, or is the  
connector fairly close?

Anybody else have anything to discuss?

Best regards,

Randall


------------------------------

Message: 2
Date: Tue, 4 Nov 2008 12:37:05 -0600
From: Randall Hauch <rhauch@redhat.com>
Subject: [dna-dev] JBoss DNA 0.4 planning
To: JBoss DNA <dna-dev@lists.jboss.org>
Message-ID: <9643F3D3-5E3F-4219-A492-6BC1F6196C73@redhat.com>
Content-Type: text/plain; charset="us-ascii"

Now that 0.3 is almost out the door, I'd like to start discussing the  
goals for the next release.

I'd love to see the JCR implementation take more shape.  Right now  
it's read-only, so getting that much farther along would be  
outstanding.  Anybody interested?  I think we could easily put several  
people to work here.  The graph API is pretty good, and should make  
implementing JCR relatively straightforward.  Any interest, Michael  
Trezzi and Alexandre and Serge?
We need to add events to the connector framework.  That should be  
pretty straightforward.  Also versioning, which will require a bit  
more work.  Plus, there are a couple of connectors that we may want to  
start working on.  This is something I'd be happy to continue with.  
Serge P. also has expressed interest in working on some connectors (in  
fact his SVN connector is coming along great!).
The CND sequencer could use some love and attention.  Dan was stuck in  
some ANLTR hell, and got pulled off onto a different project.  Since  
it uses ANTLR, maybe you might be interested in it, Alexandre?
We also have a need to start working on a REST/WebDAV layer that  
allows other client apps to access a DNA repository.  There's a couple  
of things we can do, including looking at Apache Sling, or using  
RESTeasy for a more simple implementation, or something else.  Sergiy  
and John both expressed interest in this.

Anything else?

We can either tackle several things at once and move them all  
incrementally, or we can do more in just a few areas.  Ideally, we're  
looking at a 4-5 week cycle (finishing before the year-end holidays.)  
A lot will depend on how much effort people might be able to dedicate  
to the project.

Please respond with your thoughts and comments!

Best regards,

Randall

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