philip, thanks for information.. i'll take a closer look at steroids1 dbus...
wkr turnguard | Jürgen Jakobitsch, | Software Developer | Semantic Web Company GmbH | Mariahilfer Straße 70 / Neubaugasse 1, Top 8 | A - 1070 Wien, Austria | Mob +43 676 62 12 710 | Fax +43.1.402 12 35 - 22 COMPANY INFORMATION | web : http://www.semantic-web.at/ | foaf : http://company.semantic-web.at/person/juergen_jakobitsch PERSONAL INFORMATION | web : http://www.turnguard.com | foaf : http://www.turnguard.com/turnguard | g+ : https://plus.google.com/111233759991616358206/posts | skype : jakobitsch-punkt | xmlns:tg = "http://www.turnguard.com/turnguard#"; 2014-04-18 22:04 GMT+02:00 Philip Van Hoof <phi...@codeminded.be>: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > > Hi Jürgen, > > In that case you should use the Steroids1 DBus object which works by > passing file descriptors and pipe(). I'm guessing that in Java you can > use the type FileDescriptor to turn that to a InputStream. > > > https://git.gnome.org/browse/tracker/tree/src/tracker-store/tracker-steroids.vala > > Steroid1's protocol that goes over pipe()/vmsplice() already passes > the variable-names and column-types over. > > Usage of Resources1 is very slow and on top it's not really a > supported interface. Resources1 is actually only for the GraphUpdated > signal, which is the only officially supported interface that the DBus > object exports. > > The Steroids1 DBus object is going to stay and is used for write > queries and fallback for libtracker-sparql in case WAL direct access > mode can't be used. > > Kind regards, > > Philip > > > Jürgen Jakobitsch schreef op 18/04/2014 15:53: > > hi philipp, > > > > i'm currently using the dbus resource because i'm writing the > > openrdf repository in java and didn't want to got down the jni, jna > > road... > > > > i already have built in a switch in tracker-resource.vala, about > > here [1], testing the cursor.get_value_type, but the returned > > value_types are not totally correct. for some uris the value is 1 > > for other uris the value type is 2... i'm gonna issue a bug report, > > as soon as i have verified, that i'm not doing something wrong.. > > also the returned value_types are only 1 or 2.. there are not other > > values (like bnode, double, date...) although the returned string > > suggest they should be used.. > > > > wkr turnguard > > > > [1] > > > https://git.gnome.org/browse/tracker/tree/src/tracker-store/tracker-resources.vala#n102 > > > > | Jürgen Jakobitsch, | Software Developer | Semantic Web Company > > GmbH | Mariahilfer Straße 70 / Neubaugasse 1, Top 8 | A - 1070 > > Wien, Austria | Mob +43 676 62 12 710 | Fax +43.1.402 12 35 - 22 > > > > COMPANY INFORMATION | web : http://www.semantic-web.at/ | > > foaf : > > http://company.semantic-web.at/person/juergen_jakobitsch PERSONAL > > INFORMATION | web : http://www.turnguard.com | foaf : > > http://www.turnguard.com/turnguard | g+ : > > https://plus.google.com/111233759991616358206/posts | skype : > > jakobitsch-punkt | xmlns:tg = > > "http://www.turnguard.com/turnguard#"; > > > > > > 2014-04-18 11:32 GMT+02:00 Philip Van Hoof <phi...@codeminded.be>: > > > > > > get_value_type and get_variable_name: > > > > > > > https://git.gnome.org/browse/tracker/tree/src/libtracker-sparql/tracker-cursor.vala#n126 > > > > > > > > > https://git.gnome.org/browse/tracker/tree/src/libtracker-sparql/tracker-cursor.vala#n139 > > > > You btw shouldn't use the DBus Resources1 object, but use > > libtracker-sparql instead. > > > > > > Ivan Frade schreef op 17/04/2014 20:14: > >>>> Hi Jürgen, > >>>> > >>>> Yes, tracker does not return bindingNames or types of the > >>>> resulting nodes. It assumes the client takes care of > >>>> interpreting the results of its query. > >>>> > >>>> A workaround would be to parse the SparQL in the wrapper and > >>>> add that information when translating the DBus result set to > >>>> the openrdf format. The binding Names can be added straight > >>>> forward from the SELECT of the query. The type information is > >>>> more complicated to deduce, based on the position in the > >>>> query and/or the rdfs:range of the properties (defined in the > >>>> ontology). > >>>> > >>>> Regards, > >>>> > >>>> Ivan > >>>> > >>>> > >>>> On Thu, Apr 17, 2014 at 10:11 AM, Jürgen Jakobitsch < > >>>> j.jakobit...@semantic-web.at> wrote: > >>>> > >>>>> hi, > >>>>> > >>>>> i'm currently developing an openrdf [1] repository > >>>>> implementation with a tracker-sparql backend via dbus. this > >>>>> will enable java developers to include tracker-sparql > >>>>> results in any application (or create a sparql endpoint) > >>>>> extremly easily. openrdf's api is quite common in the > >>>>> semweb community.. > >>>>> > >>>>> everything is working very nice already the only trouble > >>>>> i'm having is that i get a vector of vectors containing > >>>>> simple strings as a result object, meaning i need to find > >>>>> out types (literals, uris, bnodes, typed literals).. > >>>>> > >>>>> is there any known way to retrieve some more information in > >>>>> the results given via dbus? also bindingNames are > >>>>> missing... > >>>>> > >>>>> any pointer really appreciated wkr turnguard.. > >>>>> > >>>>> > >>>>> [1] http://www.openrdf.org/ > >>>>> > >>>>> | Jürgen Jakobitsch, | Software Developer | Semantic Web > >>>>> Company GmbH | Mariahilfer Straße 70 / Neubaugasse 1, Top 8 > >>>>> | A - 1070 Wien, Austria | Mob +43 676 62 12 710 | Fax > >>>>> +43.1.402 12 35 - 22 > >>>>> > >>>>> COMPANY INFORMATION | web : > >>>>> http://www.semantic-web.at/ | foaf : > >>>>> http://company.semantic-web.at/person/juergen_jakobitsch > >>>>> PERSONAL INFORMATION | web : http://www.turnguard.com > >>>>> | foaf : http://www.turnguard.com/turnguard | g+ > >>>>> : https://plus.google.com/111233759991616358206/posts | > >>>>> skype : jakobitsch-punkt | xmlns:tg = > >>>>> "http://www.turnguard.com/turnguard#"; > >>>>> > >>>>> _______________________________________________ > >>>>> tracker-list mailing list tracker-list@gnome.org > >>>>> https://mail.gnome.org/mailman/listinfo/tracker-list > >>>>> > >>>>> > >>>> > >>>> > >>>> > >>>> _______________________________________________ tracker-list > >>>> mailing list tracker-list@gnome.org > >>>> https://mail.gnome.org/mailman/listinfo/tracker-list > >>>> > > > >> > > > > > > > > _______________________________________________ tracker-list > > mailing list tracker-list@gnome.org > > https://mail.gnome.org/mailman/listinfo/tracker-list > > > > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v2.0.20 (MingW32) > Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ > > iQEcBAEBAgAGBQJTUYVcAAoJEEP2NSGEz4aD1eAH/j59ejV3/wkgPzUR22trrNOj > KqFBT1YRP9631NyZmphdP5q3giRnihBEjkLjF1P46eqOoO6zhRP8jo/qj64amHW8 > nUZ96/21ZBPp0kNeKij5vjIq5SxrqSAh6n4e0VQTP/rpwm70OoCz9h/6yKskk9Ln > EUYIHb3b4T1YUPHleuJ2SkFNsDgx71MmT2nXvCzKxf2DSB9XGupOCysPPuPbxEBf > 4QofLlZmbyxiftz+Hb0g6PLFm0SFIAxGz1sWVVZHoxy7Ff2+xMrrFl3p+3ktlx6w > kZkqN7cEcqdzxzNqzqGlB7i67wIHfN3OtYMbhaZlt3UsfAsvKSRDbl/LONuilkM= > =D9Uo > -----END PGP SIGNATURE----- >
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