[ZODB-Dev] Conflict resolving persistent queue?

[Chris Withers]

Hi All,

I was wondering whether anyone had implemented a FIFO persistent queue 
class which has the following conflict resolution strategy:

two concurrent adds: adds both new items to the end of the queue in a 
time-based order

one add and one remove happening concurrently: add the new item and 
remove the removed item

two concurrent removes: re-raise the conflict error.

I can't imagine it'd be hard to knock one up in python if not, in which 
case:

- is there any similar python code I can look at for examples?

- how would I write unit tests for the above 3 cases?

cheers,

Chris

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