🚀 dragonfly-cache

TypeScript implementation of a Dragonfly cache, as designed by DragonflyDB.

Dragonfly doesn't only care about recency of access, it also considers how often a particular entry has been accessed. It's a design that combines the best of LRU, 2Q and Dashtable cache designs by providing a table of segments, each of which contains buckets that are both protected and probationary. The final design easily outperforms standard solutions like Redis. You can find more info on the design in the DragonflyDB GitHub README and the Dashtable integration doc.

Getting Started

npm install dragonfly-cache

or

yarn install dragonfly-cache

How to Use

The module exposes a DragonflyCache class that can be instantiated with a number of options:

import { DragonFlyCache } from 'dragonfly-cache';

const OPTIONS = {
    maxSegments: 1000,  // Maximum number of segments for the cache to hold
    regularBuckets: 54, // Number of protected buckets per segment
    stashBuckets: 6,    // Number of probationary buckets per segment
    bucketSize: 14      // Number of entries in each bucket
}

const cache = new DragonflyCache(
    OPTIONS.maxSegments,
    OPTIONS.regularBuckets,
    OPTIONS.stashBuckets,
    OPTIONS.bucketSize
);

You can then use the cache with the expected methods:

cache.add('id1', value1);
cache.add('id2', value2);
cache.add('id3', value3);

cache.get('id1'); // Returns value1

Contributions

dragonfly-cache is open source and MIT. Please consider contributing if you see any ways that the module can be improved!