Andrea, I am not certain that Cassandra will work for a Jena graph store because of the requirement for the primary key column. But...
The easiest mechanism for extension is to extend GraphBase. As the documentation states: GraphBase is an implementation of Graph that provides some convenient base functionality for Graph implementations. Subtypes of GraphBase must provide performAdd(Triple), performDelete(Triple), graphBaseFind(TripleMatch,TripleAction), and graphBaseSize(). GraphBase provides default implementations of the other methods, including the other finds (on top of that one), a simple-minded prepare, and contains. GraphBase also handles the event-listening and registration interfaces. When a GraphBase is closed, future operations on it may throw an exception. Once that is working you can override other methods to provide better performance. Claude On Fri, Aug 1, 2014 at 6:57 PM, Andrea Gazzarini <[email protected]> wrote: > Hi devs, > for a project where I'm working on, I'd need to use Jena over a nosql > storage for storing and queryjng rdf, specifically using Cassandra. So > after googling a bit I wasn't able to find something that fits my needs. > > On top of that, i'd have the following questions: > > - do you know if there's something ready to use? > > - in case the answer to the previous question is negative, I'm actively > participating in the development of CumulusRDF [1], an RDF store that uses > Cassandra...but unfortunately is not using Jena :( so, here's the > question...do you think a jena-cassandra could be a useful contribution? I > could reuse something did for that project (appropriately translated into > jena domain). In case, could you please give me some advice (e.g. extension > points on the jena api) to start? > > Best, > Andrea > > [1] https://code.google.com/p/cumulusrdf > -- I like: Like Like - The likeliest place on the web <http://like-like.xenei.com> LinkedIn: http://www.linkedin.com/in/claudewarren
