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Re: D-BUS versus GDOMAP (WINDOWS users please note)


From: Rogelio Serrano
Subject: Re: D-BUS versus GDOMAP (WINDOWS users please note)
Date: Tue, 31 Aug 2004 15:04:48 +0800

On 2004-08-31 14:44:45 +0800 Richard Frith-Macdonald <address@hidden> wrote:


On 29 Aug 2004, at 19:49, Alex Perez wrote:

Rogelio Serrano wrote:

is DO similar to d-bus? Or can we implement something like dbus using DO?
D-bus is basically "DO Done Right" (with a proper authentication mechanism and significantly more focus on security. I've suggested a few times in #GNUstep (and maybe here on the list as well, check the archives)

not that I can see ... I don't think most developers use IRC.

that we replace gdomap with it, since it's a lot more secure, more generally accepted as "canonical", has a much larger userbase, is a Freedesktop.org spec/app, meaning that Those Other Desktops(tm) will eventually use it (and quite possibly Xorg itself at a future date (after 6.8 is released, for sure)

This is the first time I've looked at it, but I've gone through the tutorials and a bit of the source code and it does not look as though there would be an easy way to use it to replace gdomap ... it would instead replace the entire transport layer. So 'D-BUS versus GDOMAP' is misleading since they are not really doing the same sort of job. While gdomap is used once per connection, to lookup the port and then the client connects directly to the server, with dbus the client connects to the bus and then passes all messages to the bus, which forwards them to the server. I think it would be possible (and desirable for GNUstep) to work out a way to use the bus solely as a name server and connect peer to peer, but that's not the way its designed. As far as I can tell, d-bus is not finished yet and is certainly not portable yet (I'm not sure it's ever intended to work under ms-windows). So if anyone wants to rewrite the distributed objects system to use d-bus, they would most likely need to contribute quite a bit of work to d-bus too.

In any event, with alexm's default set, you do not need gdomap running for local-host DO (you only need it for inter-host DO) Personally I think that should be the default, but I'm relatively convinced that Richard Frith-McDonald would disagree with me on that point.

To the best of my knowledge, you have always been wrong/misleading when stating what my opinions would be! I would be happier if you didn't do it.

If anyone agrees that gdomap should be disabled by default (keeping in mind that functionality is not lost for intra-host DO, and only for inter-host DO) please voice your opinion on the matter here. IMHO, gdomap shouldn't be required to simply run a GNUstep app, since this creates problems with setup of the environment that cause potential converts to scurry into the underbrush before we can feed them the Kool-Aid.

Richard, I'd also appreciate it greatly if you'd give us your opinion on the matter. As far as I understand it, with alexm's default set right now, inter-host DO is still possible but you have to explicitly say you want it.

I would prefer to have host-local DO with filesystem based service name lookup the default, but there are still a few problems with it. I had a long, confused discussion about it with Alexander many months ago, in which the final position as I understood it was that we would progress when he had time to do some coding. At the time I was a bit concerned about how tested/reliable the new code was (that's no longer an issue). There are a few other concerns...


I think DO is more like the libdbus layer not the message bus layer. Im not really interested in using it. We can instead create something similar to the dbus daemon.

Can DO use unix domain sockets? Im more intereseted in using the message bus daemon idea to emulate mac os x boot services. And on demand startup of system services. So I can simplify my init.app. its a mess now with boot script tracking and dependency tracking and system shutdown.


--
Blood is thicker then water... And much tastier
                            John Davidorff Pell





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