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From Brett Porter <br...@apache.org>
Subject Re: [discuss] repository metadata
Date Thu, 07 Aug 2008 13:12:48 GMT
Any thoughts?

On 28/07/2008, at 2:31 PM, Brett Porter wrote:

> Hi,
>
> For some time (probably close to 2 years!) I've been thinking about  
> a different way of storing metadata in the repository due to  
> limitations in Maven's metadata (both the maven-metadata.xml files  
> and POM files) - primarily a lack of extensibility (and thus the tie  
> to Maven itself). In addition, I'd like to avoid the requirement to  
> have a database for Archiva to work (and rather have it as a useful  
> addition for easy searchability).
>
> I think it'd be interesting to start being able to attach arbitrary  
> metadata to artifacts. For example:
> * Maven metadata as it does now
> * OSGi information extracted from the JAR
> * Ivy metadata so we could bridge those repos and vice-versa
> * references continuous build results
> * references to historical coverage, test, etc results
> * allowing users to add their own metadata types and attach them
>
> About a year ago at DevZuz we had a lot of success with a prototype  
> of a metadata repository (based on the now defunct Eclipse Kepler  
> project) that could read in Maven repositories but also other  
> repository types, and then store that in Kepler format and push it  
> to other sources (we had a JPA store, for example). I'm not  
> proposing to use any of that, but the idea worked out well.
>
> So, I've been thinking about making some changes to Archiva along  
> these lines.
>
> I would see this as becoming the "state" Archiva knows about a  
> repository (and it should be entirely self-contained). So the lucene  
> indices, database, and others are purely alternate storage  
> mechanisms of the metadata for various applications of it.
>
> Each element is timestamped making scanning operations simpler. When  
> you run a particular consumer it can just check if the metadata for  
> it is there already, and add or update it as needed (so a "full  
> scan" would be reasonably efficient still).
>
> While the metadata can be stored inside the repository, it should be  
> possible (and maybe preferable?) to store it completely separately.  
> This also makes it possible for one metadata repository to represent  
> multiple source artifact repositories (possibly on a different  
> server - you could run an Archiva scan on that repository and push  
> metadata updates over JMS/REST to the database/lucene-backed webapp).
>
> I think it would be valuable to use a format that is easily bridged  
> to web services to avoid too much rework..
>
> That's just some of my thoughts for now. What do others think?
>
> James, how would this fit with your new repository API?
>
> Cheers,
> Brett
>
> --
> Brett Porter
> brett@apache.org
> http://blogs.exist.com/bporter/
>

--
Brett Porter
brett@apache.org
http://blogs.exist.com/bporter/


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