raptor-cache/lib/MemoryStore.js

Efficient JavaScript cache implementation that is safe for concurrent reads and writes

'use strict';

var ok = require('assert').ok;
var CacheEntry = require('./CacheEntry');

function MemoryStore (options) {
    this.cache = {};
}

MemoryStore.prototype = {
    free: function () {
        this.cache = {};
    },

    get (key) {
        return Promise.resolve(this.cache[key]);
    },

    put: function (key, cacheEntry) {
        ok(typeof key === 'string', 'key should be a string');
        ok(cacheEntry != null, 'cacheEntry is required');

        if (!(cacheEntry instanceof CacheEntry)) {
            cacheEntry = new CacheEntry({
                key: key,
                value: cacheEntry
            });
        } else {
            cacheEntry.key = key;
        }

        this.cache[key] = cacheEntry;
    },

    remove: function (key) {
        delete this.cache[key];
    },

    flush () {
        // don't need to flush memory cache stores
        return Promise.resolve();
    }
};

module.exports = MemoryStore;