Thread: Re: [Easyb2k-devel] Application Structure

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Hi Marcos,=0AI can see how the daemon is launched as soon as a device is pl=
ugged in, via HAL.=0ABut how can the daemon start a certain glue software (=
and maybe the associated VoIP app)? How can one determine how many VoIP app=
s are installed? And what is a VoIP ping?=0AYour pt. 3b looks more practica=
l than 3a but glue software might be part of the VoIP app and started with =
it, not by the daemon, couldn't it?=0AAs long as we do not have nailed down=
 the top-level design and the interfaces between the components (at least t=
o some point) I do not think checking in libyealink makes much sense! It su=
re can serve as one of the sources for the device plugin but probably does =
not resemble the future device plugin. (BTW, I would also like the plugin t=
o be renamed a bit.)=0ARegards,=0A-Thomas=0A=0A=0A----- Original Mail ----=
=0AVon: Marcos <ma...@un...>=0AAn: eas...@li...urceforg=
e.net=0AGesendet: Dienstag, den 30. Oktober 2007, 21:38:21 Uhr=0ABetreff: R=
e: [Easyb2k-devel] Application Structure=0A=0AHi!=0A=0AFirst of all, I beli=
ve the yealink devices can be abstracted to a=0A generic yealink devices, w=
ith=0Acapabilities. Thomas did a great job on his libYealink about that. =
=0A=0AOur design is by now it extremely complicated. Skypemate is simple=0A=
 because it just work with one=0Adevice at the same time.=0A=0AIf you plug =
two devices, it will just pick one at random and ignore the=0A other.=0AThe=
refore you can not have two devices on the same machine. I don't=0A like th=
at.=0ANevertheless you can have more glues (SkypeMate,YahooMate, etc ) on t=
he=0A same machine. The user=0Ajust load the specific WHATEVERmate, and whi=
chever gets loaded first=0A "owns" the device. =0AIn such a scenario, there=
 is always one device and one glue, so the=0A choice is trivial. I don't=0A=
like that either.=0A=0ANow how are going to manage multiple devices and glu=
es without a=0A configuration file ?=0AI can not see any simpler design tha=
n:=0A=0A1) The user plugs a device. =0A2) The daemon is automatically launc=
hed.=0A3a) If there is just one device and one VoIP program, the specific g=
lue=0A is loaded with the device=0Aas a configuration.=0A( a VoIP ping shou=
ld be implemented by the glues....)=0A3b) The daemon gets the device's seri=
al number and launches/loads the=0A right glue (informing which=0Adevice th=
e glue should use) according to the configuration file.=0A=0ANotes:=0A- If =
the glue talks to the device thought the deamon, it will talk=0A through a =
generic device, with=0Acapabilities.=0A- If the glue talks directly ( and I=
 can not see a reason for that, the=0A daemon closes )=0A=0ATo make things =
simple for the user, a configuration program could be=0A implemented and po=
p up=0Awhenever the second device gets plugged. We could have two special=
=0A devices called "GLUE DISABLE"=0Aand "ANY DEVICE". Any newly installed g=
lue will be by default connected=0A to the "any device"=0Adevice.=0A=0A=0AI=
 still have not seen/understood anything simpler.... Daniel, your=0A sugges=
tion does not handle=0Amultiple glues per device.=0A=0ABy the way, I implem=
ented a program called lsYealink, which list the=0A yealink devices. It is =
in the=0ASVN. (sf.net/easyb2k) =0AThomas, please upload libyealink to the s=
vn, so I can add my code to=0A it.=0A=0A=0AMarcos=0A=0A=0A--- Thomas Reitma=
yr <tre...@ya...> schrieb:=0A=0A> Hi,=0A> after reading through the =
various emails I missed before, I have a=0A few=0A>  comments / suggestions=
 / thoughts:=0A> =0A> * Using D-BUS instead of UNIX sockets sounds like a g=
ood idea. Using=0A>  David's drawing the structure would look like=0A> =0A>=
   VoIP application=0A>         ^=0A>         |   (any protocol, depending =
on VoIP application)=0A>         v=0A>   Glue Software (most likely a separ=
ate component, like gnomemeeting=0A>  connector)=0A>         ^=0A>         =
|   (D-BUS)=0A>         v=0A>   Our Daemon=0A> =0A> * Also I love the idea =
of using HAL, it provides enough information=0A for=0A>  the daemon to load=
 the appropriate low-level device plugin (i.e.=0A>  libyealink) and notifie=
s the daemon about new or removed devices.=0A The retrieval of the serial=
=0A> number (or any other distinctive value) could then be implemented in=
=0A the driver plugin.=0A> =0A> Now a question:=0A> You discussed that ther=
e could be a "single device" mode (i.e. grab=0A the one device available)=
=0A> and a "multi-device" mode, which requires a command-line argument to=
=0A the daemon or, if missing,=0A> asks for for it.=0A> Now what I am not 1=
00% understanding in this setup is:=0A> 1. Who starts the daemon, i.e. who =
is responsible for supplying the=0A command-line argument?=0A> 2. How can a=
 user select the right device without diving into the=0A guts of some start=
up file?=0A> =0A> What I have in mind would be a daemon which consists of t=
he following=0A components:=0A> =0A> a. The daemon core which is only respo=
nsible for =0A>    - providing the D-BUS object any glue initially connects=
 to=0A>    - tracking available devices via HAL=0A>    - dynamically loadin=
g the device plugin depending on HAL's device=0A properties=0A>    - spawni=
ng a daemon device manager (see b.) for a specific device=0A by request of =
glue software=0A>    - providing a list of available devices by request of =
glue=0A software=0A> =0A> b. The daemon device manager, which is instantiat=
ed for each device=0A when it is requested by glue=0A> software and which=
=0A>    - provides the main D-BUS interface for the phone functionality on=
=0A one side=0A>    - talks to the device plugin on the other side=0A>    -=
 could also implement DTMF or Bell 202 signaling if required by=0A phone (i=
mplementation=0A> detail)=0A>    - also (via D-BUS) provides information ab=
out configuration=0A parameters and methods for=0A> setting/getting these p=
arameters (Note: The parameters depend on the=0A selected phone model.)=0A>=
 =0A> The device plugin(s) could have the following tasks:=0A> - provide a =
defined interface to the daemon, including advertising=0A some low-level ca=
pabilities=0A> if that makes sense for easier implementation of the daemon =
device=0A manager=0A> - provide a unique ID for a specific phone to be pass=
ed on all the=0A way up to the glue software=0A> to later identify the phon=
e=0A> - implement the low-level USB calls to the device.=0A> =0A> With this=
 infrastructure the glue software would register with the=0A daemon core an=
d if it does=0A> not know about a previously selected specific device, ask =
the daemon=0A core for the first=0A> available device. It could also prompt=
 the user to select one of the=0A available devices. If the=0A> glue softwa=
re has found an already selected device ID in its=0A configuration, it coul=
d ask for=0A> that specific device only.=0A> >From this point on it would o=
nly talk to the newly created daemon=0A device manager about=0A> configurat=
ion parameters and then about the general phone operation.=0A> =0A> Did I m=
iss KISS?=0A> Is this too complicated, is there a simpler structure allowin=
g=0A similar convenience like=0A> SkypeMate?=0A> =0A> Regards,=0A> -Thomas=
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