hit-cache

A memory caching library, which uses hits to a key as cache expiry vector.

This is a wrapper on top of the https://github.com/ptarjan/node-cache which provides time & hits based cache expiry, simply put content which are fetched frequently stay in the cache for longer vs content which do not have same frequency get pushed out of it.

Example:

// const cache = require('memory-cache');
// const hitCacheType = require('memory-cache').HitCache;
// const hitCache = new hitCacheType(cache);
//OR
const hitCache = new hitCacheType();

hitCache.set("Laukik", "Disappears in 5 seconds, cause not hits.", 5000);
setTimeout(() => {
    console.log("Laukik: " + hitCache.get("Laukik")); //Expected: Null
}, 6000);
hitCache.set("Popular-Laukik", "Will not disapper in 5 seconds, cause it got hit.", 5000);
//IMP:Every call to get for a given key will increase the life by lifespan param provided at the time of set.
setTimeout(() => {
    console.log("Popular-Laukik: " + hitCache.get("Popular-Laukik")); //Expected: "Will not disapper in 5 seconds, cause it got hit."
}, 2000);
setTimeout(() => {
    console.log("Popular-Laukik: " + hitCache.get("Popular-Laukik")); //Expected: "Will not disapper in 5 seconds, cause it got hit."
}, 6000);

API

Constructor constructor(cache)

• Parameter cache: Instance of the cache which should hold values. Eg:require('cache').Cache or require('cache')

set set(key, value, lifeSpan)

• Parameter key : Key for the cached value.
• Parameter value : Content to be cached.
• Parameter lifeSpan : Default expiry time for the content, after which it will be evicted from cache unless it has hits.

get get(key)

• Parameter key : Key for the cached value.
• Returns null if the key is not found, else returns content and increases its lifespan by lifespan parameter defined at the time of set.