[RFC] unique SMS IDs

Hi list,

currently bearerbox acts like:
whenever an SMS is passed to the store-file it get's an incrementaly
counted ID and then stored.

It is desirable (for several purposes) to have unique IDs for messages
coming in (SM-MO), hence when entering the system from SMSC side and
when leaving to the HTTP (application server) side, and of course vise
versa.

Hence, I'd like to discuss how we can acchive uniqueness of IDs
accross even several parallel running bearerbox instances on one box.

From our perspective there are two ideas:

  * heuristical: assume that a constructed ID = timestamp + sender +
receiver + counter is unique accross all instances.

  * ID pool caching: which means there is a thread in bearerbox with a
ID queue. The queues in several concurrent bearerbox processes are
distinct, which means the thread has to garantee whereever he obtains
a pool of IDs, that those are assign only to himself. 

Option 1 is of course simpler to do. Option 2 is *stronger* in the
sense of high-load systems and consistancy.

Any thoughs for this?

BTW, I'd also like to add the SMS ID to the access.log. Any
objecttions here?

Stipe

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