Cache-aside

Pluggable read-through, write-behind cache.

Install

npm install --save cache-aside

Usage

// Pull in the implementation to use 
const MemoryStore = require('rtcache').MemoryStore;

// Cache populator function
const provider = (key, cb) => {
    // Load data for your cache for the given key
    if (key === 'MyKey') {
        return cb(null, 'Some data');
    }
    return cb(null, 'Other data');
};

// Non-expiring cache
const cache = new MemoryStore('MyCache', provider);

// Expire items 5 seconds after caching
const expiringCache = new MemoryStore('ExpiringCache', provider, 5000);

cache.get('MyKey', (err, data) => {
    if (err) return console.error(err);
    console.log(data); // Prints 'Some data'
});

Documentation

API

Emitted Events:

• error (error)
• cacheMiss (key)
• cacheHit (key)
• cachePopulated ({key, data})

Available Stores

• AWS DynamoDB
• AWS S3
• In Memory

Extending

To implement your own backend Store, extend AbstractStore and override the constructor, _read and _write methods to read/write to your backend.