Atomic Counters
Project description
Atomic Counter
Overview
atomic-counter
is a rust library for generating a monotonically increasing sequence of integers. Depending on the particular configuration of the counter, the generated sequence will be produce unique numbers down to the nanosecond, regardless of memory state.
E.g. if you quit the process and recreate a new counter >1ns
later, your sequence is guaranteed to still be monotonically increasing (but with a gap).
Usage
from atomic_counter import Counter
c = Counter(offset_in_nanos, base_in_nanos)
c.next() # generate next number in sequence
Here, base
is the counter's 0
value (e.g. a epoch in nanos to consider the 0
point, to keep numbers as small as possible if you do not need to go back to 1970). offset
is the number of nanos since base
at which to start.
If unset, base
will be 2010-01-01
in nanos, offset
will be 0
, which means the counter will start at (now - 2010/01/01) as nanos
.
To create e.g. a daily counter, pass in base=today in nanos
. As this is a common occurrence for sequences that reset daily, a convenience function def daily() -> Counter:
is provided.
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