No way to advertise an interface?

[Anders Feder]

"the other bus" was a typo, I just meant "the bus".

ons. 29. sep. 2021 09.57 skrev Anders Feder <anders.feder.83 at gmail.com>:

> No, that is the rub. In the example with two applications both deciding to
> take the bus name “org.mpris.MediaPlayer2.musicplayer”, you do in fact need
> both to available on the bus at the same time. Because otherwise one of
> them precludes the other from being controlled by clients.
>
> It is currently possible to have for instance VLC and Spotify both running
> and both controllable via MPRIS at the same time. But this is only possible
> because they happen to have different names and their programmers therefore
> have chosen to take different bus names.
>
> If they had chosen to take same bus name because they were not aware of
> each other, then one would either replace the other on the other bus or
> have to wait in queue as you say, thus preventing one of them from being
> controlled this way.
>
> The way MPRIS is designed, the programmer must choose a bus name and can
> then only pray that no other media player will try to use the same name. In
> my view, this is not a good design. I would be interested to understand if
> a better design could be made or if D-Bus could be extended to support this
> scenario or if not why not.
>
> Regards,
> Anders Feder
>
> ons. 29. sep. 2021 09.27 skrev Lawrence D'Oliveiro <
> ldo at geek-central.gen.nz>:
>
>> On Wed, 29 Sep 2021 08:03:20 +0200, Anders Feder wrote:
>>
>> > If a person A creates an application named "Music Player" and have it
>> > take the bus name "org.mpris.MediaPlayer2.musicplayer", there is no
>> > procedure preventing a person B without knowledge of person A's
>> > application from creating another application named "Music Player"
>> > also taking the bus name "org.mpris.MediaPlayer2.musicplayer".
>>
>> It is true that D-Bus has no concept of “group” or “multicast” names;
>> each name can belong to only one bus peer. But remember that, if you do
>> not specify DBUS_NAME_FLAG_DO_NOT_QUEUE when trying to register a name
>> and it is already taken, then you will be placed in a queue to get it
>> when the existing owner relinquishes it.
>>
>> That way, anybody looking for “org.mpris.MediaPlayer2.musicplayer” only
>> sees one. Quit that one, and the other should appear. After all, you
>> only need one at a time, don’t you?
>>
>
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