cache clean

A cache style, very simple cache

The cache works in way similar to Unix page-stealer. A single asynchronous task wakes up at regular interval (the ttl in s.) and for each object referenced in the cache, performs one of the following :

• if the reference is "marked" : remove it (steal it)
• if the reference is not "marked" : mark it (preapare to steal)

The cache is used as a key/value map. Each time a reference is accessed by the application it is "unmarked", allowing it to stay in the cache at least on more cycle. A reference that is not accessed any more will remain in the cache between ttl and 2 * ttl seconds.

Install

npm i @habibouldmoussa/cache_istos

Usage

The following create a stealer task that will automatically stop when the application ends :

const stealer = new Stealer({ ttl: 2, unref: true });

By default, the stealer task won't stop automatically, this must be done by the application :

const stealer = new Stealer({ ttl: 2 });
...
stealer.destroy();

To set / get a reference to the stealer :

stealer.set("ref", {...});
...
const myRef = stealer.get("ref");

A reference can be deleted before it is stealed :

stealer.delete("ref");