A Clojure library with one function: redis-memoize. It works like clojure.core/memoize, but keeps the values across JVM restarts thanks to Redis. Hashing is done based on function name and optional seed (for when function name does not change, but implementation changes).
Redis is handled by Carmine. The memoizer requires Redis.
The included redis.conf sets up Redis to function as a LRU (Least Recently Used) cache, with 1 GB memory limit.
[com.keorn/persistent-memoizer "1.1-SNAPSHOT"]Start Redis server on at localhost:6379:
redis-server redis.conf(ns your.ns
(:require [keorn.persistent-memoizer :refer [redis-memoize]]))
;; Define your computationally expensive function
(defn slow-return []
(Thread/sleep 3000)
[42 "cheese"])
;; Memoize it
(def fast-return (redis-memoize slow-return))
;; Call it once, wait for computation
(fast-return)
;; Call it again: returns memoized value. Persists, as long as, it is still in Redis
(fast-return)
;; If the function implementation changes, then either change the function name, or add a seed value to memoizer
(def fast-return-new (redis-memoize slow-return 42))Serialization is done using Nippy, types are handled as follows:
| Clojure type | Redis type |
|---|---|
| Strings | Redis strings |
| Keywords | Redis strings (v2+) |
| Simple numbers | Redis strings |
| Everything else | Auto de/serialized with Nippy |
Copyright © 2016 FIXME
Distributed under the Eclipse Public License either version 1.0 or (at your option) any later version.