KDE Geolocation Services
johnlayt at googlemail.com
Thu Nov 4 08:34:44 GMT 2010
On Wednesday 03 November 2010 22:27:11 Aaron J. Seigo wrote:
> that said, what dependencies does Geoclue have these days? it used to
> depend on gconf, which would be a highly unfortunate dependency for
> kdelibs to acquire. it was said a few years (!) back that this dependency
> would be easy to remove and would likely be. has it been?
Well, to be slightly clearer, the whole point of having our own phonon-like
api would be that there would be no hard dependency on any backend, Geoclue or
otherwise. No Geoclue installed, we try a different backend, perhaps having a
default hostip fallback. If no backends are available (or can't determine
your location) you get a null location.
I've had a poke around, and there still is a partial GConf dependency, but
apparently only in the Master Provider:
A quick explanation, Providers are the backends like gpsd or hostip that you
can query for your location. You can choose to query any one of these
directly, but the Master Provider implements logic to decide for you which is
the best one to query. In theory, you don't need to install the Master
Provider, or indeed any single Provider, if you don't want to (although I
haven't checked how easy the build system makes this).
In openSuse at least the Master Provider is packaged separately to libgeoclue
and the the other Providers, allowing libgeoclue to rely 'only' on glib and
gobject, leaving the Master Provider to pull in gconf.
This makes it possible for us to choose not to depend on the Master Provider,
but the base library only, and implement our own Master Provider in our api.
Our api would already have been deciding which backend to call, Geoclue or
something else, it would now also have to choose which Geoclue backend to
call. While it would make the api somewhat fatter than I had thought, it
perhaps would be more flexible and future proof.
With regards to the roll-our-own vs QtMobility option, I wonder what
QtMobility's dependencies are? Is Geoclue a hard dependency, or does it also
have its own Master Provider concept making Geoclue optional?
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