[jdev] Message Routing
jonathanD at k2.com
Mon May 19 03:02:53 CDT 2008
How does the semantics of message routing work (involving resources)?
I have come up with the following (for a message sent to joe at server.com<mailto:joe at server.com>):
1. Is the destination on this server?
a. No -> Open or use S2S connection and route the packet there.
2. Does it have a resource?
a. No -> Find the lowest resource and route.
3. Is the resource online?
a. Yes -> Route it to that connection.
b. No -> Is the user online?
i. Yes -> *What to do here?* (Assuming that joe at server.com<mailto:joe at server.com> or joe at server.com/resource<mailto:joe at server.com/resource> is online)
ii. No -> Store it in DB for later.
I know this has come up before, but what about duplicate destinations? If a *nuclear reactor is overheating* packet is sent to joe at server.com<mailto:joe at server.com> and he has three resources:
joe at server.com/mobile<mailto:joe at server.com/mobile> (0)
joe at server.com/pc<mailto:joe at server.com/pc> (1)
joe at server.com/allfail<mailto:joe at server.com/allfail> (0)
Thus now he has identical resources in case a message is sent to his mobile, and it needs urgent action (but he isn't online). Can't messages be routed to all resources with identical priorities?
Thanks for your time.
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