TTL memoization

The time-to-live cache is one that evicts items that are older than a time-to-live threshold (in milliseconds).

General use

To create a core.memoize TTL-backed memoized function use the clojure.core.memoize/ttl function with an optional seed map or a :ttl/threshold parameter:

(memo/ttl function <seed> <:ttl/threshold number>)

Example code is as follows:

(ns your.lib
  (:require [clojure.core.memoize :as memo]))

(def memoized-fun
  (memo/ttl identity {} :ttl/threshold 3))

The default :ttl/threshold value is 2 seconds before the TTL logic is applied.

Please read the clojure.core.cache information regarding TTL caches for more detailed information, use cases and usage patterns.

As always, you should measure your system's characteristics to determine the best eviction strategy for your purposes.