shutting down gpsd backend

[keith preston]

On 7/20/07, Jussi Kukkonen <jhkukkon at cc.hut.fi> wrote:
>
> keith preston wrote:
> > There was a part in the api specification for shutting down backend
> > services.   We could call that method, although it doesn't quite work if
> > others are listening.    There could be a shutdown signal broadcast to
> > inform users that a backend is going down an a stop shutdown method.
> I'm
> > open to other ideas.   Or we could just ignore this because if it gets
> > shutdown and someone else makes a dbus call to it, it will restart.
>
> I like the shutting_down-signal idea. At least it's the best solution I
> can think of. So the plan is this:
>
> 1. Add functions to C library
>       geoclue_*_shutdown_specific(service, path);
>
>    I can't imagine where a default version  (like with init) would be
>    needed... but geoclue_*_shutdown_all() might be useful.


I do like the idea of geoclue_*_shutdown_all to be a geoclue master api.



2. Add signals to backend interface (and corresponding callback-setters
>    in C library):
>       <signal name="shutting_down">
>       geoclue_position_set_shutdown_callback()
>
>    How does the dbus stuff work: do the receivers know which backend
>    sends shutting_down-signal (in case there are several running) or
>    should that info be included as an argument?


Yes, the receivers should know who sends the signal.   To hear the signal
the receivers must specifically subscribe to a signal from dbus.   So when a
reciever connects to a backend, it will also connect to it's shutdown
signal.

 Keith
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