[sldev] Understanding the viewer event queue code

[Tess Chu]

The viewer requests for capabilities via the seed capability.   
"EventQueueGet" is the capability for polling for events queues for  
the client from the region.  The viewer then periodically invokes that  
capability essentially polling the server for messages.  See  
llviewerregion.cpp, lleventpoll.cpp.  There are then routing code that  
maps  the events received to the registered http handlers that you see.

- Tess

Sent from my iPhone

On May 20, 2009, at 9:00 AM, Infinity Linden <infinity at lindenlab.com>  
wrote:

> lemme dig through my notes and see if i have more / better  
> documentation on using caps.
>
> yes. if the viewer is still as i remember it, we have an event queue  
> for the region you're connected to and for each adjacent region for  
> object updates from child cameras. (but... it's been close to a year  
> since i touched the client code... though the llmessage code is  
> shared between viewer and server.)
>
> On Wed, May 20, 2009 at 7:49 AM, Suzy Deffeyes <suzyq at pobox.com>  
> wrote:
> I'm attempting to understand how the event queue in the viewer  
> works, specifically, creating and registering new services. I'm  
> thankful for the documentation in llhttpnode.h, but I'm still  
> scratching my head a bit.
>
> In LLHTTPRegistrar::buildAllServices(), I see all the message/* type  
> nodes getting registered, as well as the trusted-message one.  I  
> *thought* all one had to do to get something registered was to have  
> something like this:
>
> LLHTTPRegistration<LLMyNodeType> gHTTPServiceAlphaBeta("/alpha/beta");
>
> So I expected (hoped?) to see the services defined in  
> llsdappservices.cpp in the call to buildAllServices....but i don't  
> see them in the list being registered.  Is there something else  
> needed? Or some other mechanism being used? Are they added later?
>
> Also, is there a separate event queue opened with each child region  
> that the viewer is connected to?  Or is there only one with the  
> region the agent is in?
> Thanks
> Suzy
>
>
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