Re: [Bluez-devel] D-Bus interfaces

[Marcel Holtmann <marcel@holtmann.org>]

Hi Fredrik,

> > ask yourself what's the indentation of hcid.conf and how should a
> > computer program know about it. Of course this is possible to handle,
> > but it is always a mess.
> 
> hcid can have some standard indentation style but it can also support
> the "--marcel-style" flag for your personal formating preferences. ;)

you don't got my point here. If a system administrator modifies some
settings in complex files like hcid.conf, everyone uses its own
identation and style to make it best readable for themself. And nobody
likes if a program changes a value and introduces some odd styles.

Config files like hcid.conf are build this way, because they can contain
complex configuration. Only the administrator should edit such files.

> > No. If we use a uniform storage, there is no need for a D-Bus interface,
> > because the application can modify the storage directly. 
> 
> "Plain text files" and "DBus interface" do not exclude each other. It
> would be great to have them both, because they serve different pruposes:

No they don't, but with an D-Bus interface we don't need to have
knowledge about these files, because this is the job of the program that
provides us with this D-Bus interface.

> Plain text files are great for admins, debugging, diagnostics etc.
> 
> DBus is great for system tools, Gnome, KDE etc. Besides, the DBus
> interfaces provide a lot more services than just maintaining files.

I was never talking about D-Bus for file maintaining. I talked about a
general interface for different tasks. If it comes to link keys or name
caches, of couse these must be stored somewhere. But you can also store
them on a SQL database in another country. Who cares? That is beyond the
interface and its the job of the program that provides this interface.

> > One of the main ideas is to abstract from the storage of the information.
> 
> Agreed. But storage abstraction does not implicate storage obfuscation,
> does it? :)

As already said, I have no problem with plain text files. But hcid.conf
is a configuration file and should only read once at startup. All other
modification have to stored in a configuration storage. If we have stuff
that overlaps, we must find a solution for it.

Regards

Marcel




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