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memoize_stampede()

memoize with cache stampede protection, as diskcache’s: a result close to expiry is

Usage

Source

memoize_stampede(
    cache, expire, name=None, typed=False, tag=None, beta=1, ignore=()
)

recomputed early, in a background thread, by one caller (Vattani et al., VLDB 2015), while every caller keeps getting the cached result. Results are stored as (result, seconds it took).

Keys, typed, ignore and the argument rules are memoize’s (D-048). It works on a NullCache (every call runs) and a durable handle (an outage runs the function), as memoize does. The time left is measured with time.time(), as diskcache’s, so a cache opened with a clock= that isn’t wall time recomputes on that clock’s expiry but judges “close to expiring” by wall time.