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My first instinct was that performance would be better if the IPC
layer could be skipped, yes. But perhaps the advantage is
negligible? One case I can think of is if there is spike in
inserts/deletes not matching any registered live query. If
using GraphUpdated, then each of these will have to go through IPC
to be checked by my implementation, even though none of them will
lead to any useful action. This seems wasteful (2 redundant context
switches etc. per insert/delete), but I am not familiar enough with
neither Tracker nor D-BUS to determine if this is likely to have
much impact in practice. Anders Feder Den 28-08-2011 20:24, Adrien Bustany skrev: Writeback and GraphUpdated are actually not that different, in the sense that they both signal updates to the outer world. They also both apply to only certain statements (filtered with tracker:notify for GraphUpdated, and tracker:writeback for writeback). One difference between GraphUpdated and the writeback signal is that GraphUpdated signals are batched together (for performance reasons), so it's not exactly real time. What exactly are you missing with GraphUpdated? The fact that it involves IPC? Cheers Adrien Le Sun, 28 Aug 2011 12:00:07 +0200, Anders Feder <lists anders feder dk> a écrit :Thanks. While studying the GraphUpdated interface, I stumbled upon the writeback feature. Apparently, it does essentially the equivalent of a live query: it populates a hash table with predicates to watch and takes an action every time data using one of these predicates is inserted or deleted in the store. Would it make sense, then, to make a more generic "stuff to watch" mechanism that can be used by both writeback and live queries? Would such a solution have any chance of being accepted into the main source tree? Anders Feder On 27-08-2011 13:02, Adrien Bustany wrote:Hi Anders you might be interested inhttps://maemo.gitorious.org/maemo-af/libqtsparql-tracker/trees/master/src/live ,which is "live query" implementation on top of qsparql, Qt's library to access Tracker (and other RDF stores). I've never used myself, but it's used in several places in the Harmattan operating system, so it must be working somehow ;) If you were to start your own implementation (for example, GLib based), I'd guess it'd sit on top of libtracker-sparql and the DBus GraphUpdated signal... Cheers Adrien Le Sat, 27 Aug 2011 00:00:44 +0200, Anders Feder<lists anders feder dk> a écrit :Hi, So, I finally managed to compile from source. I noted that in your wiki you list "live queries" / "views" as a thing you would like to implement in the future. I too am interested in such a feature, and was wondering if anyone could please me give some pointers as to how I might go about working on this item? I.e. where in the codebase would you add this functionality, are there any other changes that must be made first, etc. Thanks, Anders Feder lør, 07 05 2011 kl. 23:49 +0300, skrev Ivan Frade: hi,it could be that you don't have the introspection.m4 file? check that you have the gobject-introspection packages installed. then try to start from scratch, with git clean -dfx (beware this will remove any file that you have added!) and the usual autogen.sh and make. hope this helps, ivan. On 5/7/11, Anders Feder<lists anders feder dk> wrote:Hi, When trying to build the latest version of Tracker from git on Ubuntu 11.04, I get the following error: autoreconf: running: automake --add-missing --copy --force-missing src/libtracker-extract/Makefile.am:76: HAVE_INTROSPECTION does not appear in AM_CONDITIONAL src/libtracker-extract/Makefile.am:77: INTROSPECTION_CFLAGS must be set with `=' before using `+=' src/libtracker-miner/Makefile.am:149: HAVE_INTROSPECTION does notappearin AM_CONDITIONAL src/libtracker-miner/Makefile.am:150: INTROSPECTION_CFLAGS must be set with `=' before using `+=' src/libtracker-sparql/Makefile.am:82: HAVE_INTROSPECTION does notappearin AM_CONDITIONAL autoreconf: automake failed with exit status: 1 Any idea what might be causing this? Thanks, Anders Feder _______________________________________________ tracker-list mailing list tracker-list gnome org http://mail.gnome.org/mailman/listinfo/tracker-list_______________________________________________ tracker-list mailing list tracker-list gnome org http://mail.gnome.org/mailman/listinfo/tracker-list -- -Anders Feder |