Re: Some comments about GVFS
- From: Alexander Larsson <alexl redhat com>
- To: Hans Petter Jansson <hpj novell com>
- Cc: gtk-devel-list gnome org, ds schleef org, Benjamin Otte <otte gnome org>
- Subject: Re: Some comments about GVFS
- Date: Tue, 08 May 2007 10:57:04 +0200
On Tue, 2007-05-08 at 03:33 -0500, Hans Petter Jansson wrote:
> I'm used to three main design patterns:
> 1) Everything in one thread with sync I/O blocking the UI. Simple code
> but unacceptable performance.
> 2) Everything in one thread with async I/O using callbacks. Fine for
> simple protocols or if you prefer an explicit state machine.
> 3) Doing synchronous I/O operations in one or more subthreads that talk
> to the main thread using asynchronous messages queues. This is nice for
> complex protocol implementations, because synchronous code is easier to
> understand and maintain.
These are the main model i see too. But none of these need any main
context but the default mainloop one...
I know Benjamin mentioned multiple contexts was needed for gstreamer
integration. It would be nice to hear some details about this
> I'm aware of the dangers - when I worked on Evolution, this caused
> plenty of pain.
> However, it's useful in very simple apps where you have e.g. a "Sync" or
> "Connect" button which desensitizes most of the UI while the operation
> is in progress, only updating a progress bar or allowing the user to hit
> "Cancel". That's what I meant by a "program that lends itself to that
> design" above :)
> So I dunno. Maybe it's too seductive and should be eliminated as an
Avoiding this problem is one of the primary reasons of going from a
stateless model (where you can get auth callbacks anytime) to a
statefull model (auth only on mount). However, that problem in gnome-vfs
happens for *all* apps, not only those that "lend itself to that
design", so its a larger problem there.
Alexander Larsson Red Hat, Inc
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