Hi Marcel,
On Tue, Aug 21, 2012 at 2:08 PM, Marcel Holtmann <marcel@xxxxxxxxxxxx> wrote:
> Hi Mikel,
>
>> >> The client D-Bus documentation should mention that all transfer paths
>> >> contain a prefix consisting of the path of the session they belong to.
>> >>
>> >> This can be conveniently used by clients to install D-Bus signal matches
>> >> that concentrate on the relevant signals.
>> >> ---
>> >> doc/client-api.txt | 2 +-
>> >> 1 files changed, 1 insertions(+), 1 deletions(-)
>> >>
>> >> diff --git a/doc/client-api.txt b/doc/client-api.txt
>> >> index 839a78c..7ca65cc 100644
>> >> --- a/doc/client-api.txt
>> >> +++ b/doc/client-api.txt
>> >> @@ -466,7 +466,7 @@ Transfer hierarchy
>> >>
>> >> Service org.bluez.obex.client
>> >> Interface org.bluez.obex.Transfer
>> >> -Object path [variable prefix]/{transfer0,transfer1,...}
>> >> +Object path [variable prefix]/{session0,session1,...}/{transfer0,...}
>> >>
>> >> Methods dict GetProperties()
>> >
>> > It would be even better to explicitly mention that the "[variable
>> > prefix]" here is the same as the "[variable prefix]" in the Session.
>>
>> This documentation pattern can be widely found in Obexd and Bluez, as
>> well as oFono. It's implicit that the variable prefix matches in both
>> cases.
>
> it actually means that you can not count on this prefix. It might change
> and it is perfect legal that it changes from one run of the daemon to
> another. The variable prefix is discovered via some defined initial
> method.
Indeed, you cannot rely on a stable prefix across different runs and
clients should not try to parse these strings, but you do have
relationships between objects that are guaranteed in the object path.
In this case you do know that, as long as the session is active (and
obviously the daemon is running), the session path will be an exact
prefix of the transfer path.
> Remember that I intermixed the PID in the object path of BlueZ. Simple
> because people started hardcoding object paths.
Yes, we need to be careful to avoid clients making false assumptions
about these paths.
Cheers,
Mikel
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