Hi Hugh, Problem solved, I had to call new virtGraph = VirtGraph() for each query and not only once. Before I only called VirtuosoQueryExecutionFactory.create(sparql, virtGraph) in each query, using the same virtGraph.
A partially related question : How do I properly use query timeouts for both jena and rdf4j providers to prevent sparql queries running a very long time on large database. Is there a good documentation ? I'm inexperienced and just learning. Best, Henrik Hugh Williams schrieb am 22.11.2017 um 13:19: > Hi Henrik, > > Can you please provide more detailed example jena3 & rdf4j sample code > demonstrating how you are seeking to use both such that we can obtain a > better understanding of the apparent concurrent query execution problem ? > > Best Regards > Hugh Williams > Professional Services > OpenLink Software, Inc. // http://www.openlinksw.com/ > Weblog -- http://www.openlinksw.com/blogs/ > LinkedIn -- http://www.linkedin.com/company/openlink-software/ > Twitter -- http://twitter.com/OpenLink > Google+ -- http://plus.google.com/100570109519069333827/ > Facebook -- http://www.facebook.com/OpenLinkSoftware > Universal Data Access, Integration, and Management Technology Providers > > > >> On 22 Nov 2017, at 08:05, Henrik Schmidt <h...@informatik.uni-kiel.de> wrote: >> >> Hi Hugh, >> >> the problem is that the jena code is blocking while executing whereas the >> rdf4j code is non blocking and does allow multiple simultaneous queries. >> >> So I'm looking for a non blocking jena solution. Is there any ? >> >> Best, >> >> Jenrik >> >> Am 22.11.2017 um 00:50 schrieb Hugh Williams: >>> Hi Henrik, >>> >>> The jena code can be simplified to the following to give an equivalent >>> execution to rdf4j: >>> >>> String query = "select ....."; >>> VirtuosoQueryExecution vqe = VirtuosoQueryExecutionFactory.create(query, >>> virtGraph); >>> >>> Best Regards >>> Hugh Williams >>> Professional Services >>> OpenLink Software, Inc. // http://www.openlinksw.com/ >>> Weblog -- http://www.openlinksw.com/blogs/ >>> LinkedIn -- http://www.linkedin.com/company/openlink-software/ >>> Twitter -- http://twitter.com/OpenLink >>> Google+ -- http://plus.google.com/100570109519069333827/ >>> Facebook -- http://www.facebook.com/OpenLinkSoftware >>> Universal Data Access, Integration, and Management Technology Providers >>> >>> >>> >>>> On 21 Nov 2017, at 14:56, Henrik Schmidt <h...@informatik.uni-kiel.de> >>>> wrote: >>>> >>>> Hi, >>>> >>>> what is a comaparable jena provider query to this rdf4j provider query ? >>>> >>>> TupleQuery tupleQuery = >>>> connection.prepareTupleQuery(QueryLanguage.SPARQL, query); >>>> >>>> I want to use the jena provider instead and I'm using this threaded so >>>> it must be connection based. >>>> >>>> My current jena implementation is using something like this : >>>> >>>> Query sparql = QueryFactory.create(query); >>>> VirtuosoQueryExecution vqe = >>>> VirtuosoQueryExecutionFactory.create(sparql, virtGraph); >>>> >>>> This will block the port (1111) until completed whereas the rdf4j code >>>> can handle multiple parallel queries. >>>> >>>> Best, >>>> >>>> Henrik >>>> >>>> >>>> ------------------------------------------------------------------------------ >>>> Check out the vibrant tech community on one of the world's most >>>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >>>> _______________________________________________ >>>> Virtuoso-users mailing list >>>> Virtuoso-users@lists.sourceforge.net >>>> https://lists.sourceforge.net/lists/listinfo/virtuoso-users >> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Virtuoso-users mailing list Virtuoso-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/virtuoso-users
