Hi Martynas,
you have already received two answers, I have two questions for you:
- Why have you been using SDB and not TDB?
- Why not to cache the entire HTML page?
Just curious.
Finally, the theme of caching SPARQL results or bindings is something I am very
interested in. Although, I've done nothing so far.
Is anyone thinking to see if caching BGPs inside ARQ (or in a separate module
which would work with ARQ) could possibly work (i.e. boost performances)?
Assuming cache will grow large, it would need to serialize bindings on disk
(see: https://issues.apache.org/jira/browse/JENA-45).
Cache invalidation, as result of an update, is also a tricky problem... as
always.
Martynas, you should really subscribe to jena-{dev|users}@incubator.apache.org,
just send an email to:
- [email protected]
- [email protected]
See you there,
Paolo
Martynas Jusevicius wrote:
Hey list,
my http://semanticreports.com webapp is based almost exclusively on
SPARQL results - mostly from remote endpoints, but it also uses SDB to
store its own RDF (meta)data.
The issue is, I still want to show the reports/visualizations based on
a previous result, even if the remote endpoint is currently down.
Which brings me to caching of SPARQL XML results - and saving them
with RDF in SDB.
I imagine it could be saved as XMLLiteral. Does this sound reasonable?
And which methods should we use? This looks about right:
http://jena.sourceforge.net/javadoc/com/hp/hpl/jena/rdf/model/Model.html#createLiteral%28java.lang.String,%20boolean%29
Thanks,
Martynas
semantic-web.dk
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