Object paths naming conventions?
thiago at kde.org
Thu Jul 17 19:39:05 PDT 2008
Havoc Pennington wrote:
>> In fact, the BlueZ group (well-known name: "org.bluez") recently moved
>> from longer names like/org/bluez/hci0 to /hci0 for one object path,
>> because the "/org/bluez" prefix really conveyed no additional
>This is wrong - the /org/bluez DOES convey additional info, and bluez
>is now broken
My take is that "hci0" does not convey enough information. It's not an
abstract concept -- it only makes sense when in connection to BlueZ. So
it should be confined hierarchically to BlueZ's namespace. Besides, what
if suddenly the interface names changed and started colliding with object
paths the application defines?
However, when you're dealing with abstract concepts like "Application"
or "Main Window" (for applications where this concept applies), then it
does make sense to use those paths (/Application, /MainWindow
or /Application/MainWindow, /Application/Window0/actions/file-open,
etc.). In those cases, the interfaces will provide the "contract" to the
Organisations like XDG could decide to standardise a subset of those
paths, under strict guidelines, like, for example, the objects that
represent top-level windows (caption, position, size, focus,
raising/lowering, maximising/minimising, etc.). Those above are meant
more for interaction with a human user of D-Bus objects.
That said, KDE Libraries do make use of non-namespaced abstract concepts
like I mentioned above. In some cases, it's justified because the objects
exposed are meant for end-user consumption. In others, when the libraries
by themselves do inter-process communication, it's less justified -- that
is, a properly namespaced path would be better to avoid conflicts.
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
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