[haiku-development] Re: Need help understanding BMessages.
- From: Zenja Solaja <solaja@xxxxxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Sun, 4 Oct 2009 10:24:30 +1100
An excellent resource on internal BeOS mechanisms from an engineering
perspective is available in the old BeNewsLetters. An archieve is kept at
several addresses, I've been using this one recently (
http://testou.free.fr/www.beatjapan.org/mirror/www.be.com/aboutbe/benewsletter/article_index.html).
If you wish, you can also search by date index (
http://testou.free.fr/www.beatjapan.org/mirror/www.be.com/aboutbe/benewsletter/index.html).
There are also links to older newsletters going back to 1995.
Be prepared to say goodbye to the rest of your weekend...
On Sun, Oct 4, 2009 at 7:55 AM, Stephan Assmus <superstippi@xxxxxx> wrote:
> Hi,
>
> On 2009-10-03 at 21:44:48 [+0200], Alexandre Moreira
> <alexandream@xxxxxxxxx> wrote:
> > Hello, everyone. I've been trying to understand the way BMessages work in
> > Haiku/BeOS, but I'm having some trouble.
> >
> > Can anyone please explain a little about how BMessages compares to
> > DBus-Style messages, so I can leverage previous knowledge to better
> > understand them?
>
> A great overview is in the BeBook:
>
> <
> http://www.haiku-os.org/legacy-docs/bebook/TheApplicationKit_Messaging.html
> >
>
> In a nutshell: BMessage is a container that can hold typed data, arrays of
> data and also other BMessages (nesting). It also offers utility methods for
> getting info about the sender of the message and how to reply. Messaging
> works either by attaching messages to the message queue of a BLooper, if it
> is part of the same process, or by flattening it and transmitting it via a
> port (a kernel feature somewhat similar to pipes). The receiving BLooper
> lets the target BHandler process the message, a BLooper is also a BHandler
> and is the default handler. I can't really say how this compares to DBus,
> since I don't know anything about it. Since BMessage passing was
> fundamental to BeOS, the BeBook explains this really well, so you should be
> able to learn everything about it from the above link and the other
> chapters.
>
> Best regards,
> -Stephan
>
>
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