[Twisted-Python] Multicast XMLRPC

[Chaz.]

Itamar Shtull-Trauring wrote:
> On Thu, 2006-08-24 at 14:13 -0400, Chaz. wrote:
> 
>> There is a problem with this approach - that is the semantics of the 
>> call. Current RPC calls are EXACTLY ONCE semantics - it either works or 
>> doesn't. In this there is an uncertainty - it might have worked and I 
>> don't know about it (the response was lost for instance) or the server 
>> itself failed and restarted. This means I can't every be guaranteed the 
>> normal call semantics. It means it switches to AT LEAST ONCE semantics. 
>>   This means I have to be careful in how I code the server side.
>  
> If your protocol has a unique message identifier you can make sure
> duplicate commands are not rerun.
> 
> 
I thought about doing that but ruled it out. So long as the server runs 
I can count on the UID being stepped correctly. If the server goes down 
and comes back up, it might be reset or set incorrectly.  So I can't 
guarantee it. Can you see another way around the problem?

Chaz