[AG-TECH] Development issue: AllocationMulticastLocation

Randy Groves randy.groves at boeing.com
Fri Oct 8 17:39:38 CDT 2004

I have a similar question - although I haven't poked around in the code yet.

I've got a Shared WhiteBoard app in the works.  Fairly simple - essentially 
just a wrapper around wbd - which runs on Windows and Linux (although I 
haven't worked on the Linux startup part yet).  Right now it just hardwires 
a multicast address and port to do the communication.  What I'm thinking of 
doing is extracting the multicast address and port of the video stream and 
allocating a port that isn't being used on that address.  Then keeping 
track of that somehow, so that a second white board in the same venue would 
get a still different port.

So, first question - is there anything basically wrong with this approach?

And second - are the hooks available and documented (pointers to code is 
fine) that will give me the current multicast address and port of the 
streams in a venue?



At 04:23 AM 10/8/2004, Socrates Varakliotis wrote:
>I was looking into AccessGrid/Venue.py, around line 926. There is a method 
>AllocateMulticastLocation() to allocate a Network Location. This code is 
>used by the Venue Server.
>I was wondering whether I could have a handle from within this method to 
>the Venue Management options.
>My problem is this:
>Say I want to check whether RANDOM or INTERVAL address allocation method 
>has been selected from Venue Management. I can do this:
>allocMethod = self.server.addressAllocationMethod
>and check with some if conditions whether allocMethod=='random' or 
>allocMethod=='interval', + other blah blah.
>What if I need to check against other "settings" from the Venue 
>Management, e.g.: what if I want to detect whether static address 
>allocation has been selected, or one of the dynamic methods? Is there any 
>attribute in the server's class to hold this information, or should I add one?
>Any ideas/help appreciated.
>Best regards,
>Dr. Socrates Varakliotis
>UCL Computer Science
>Gower Street, WC1E 6BT, London, UK
>Tel: +44 20 7679 3696
>Fax: +44 20 7387 1397

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