dnsd-name/lru.js

Dynamic authoritative name server for Iris services

var LruCache = require('lru-cache');

var LruWrapper = function () {
    var lru;

    var passiveLru = {
        get: function () {
        },
        set: function () {
        },
        del: function () {
        }
    };

    var activeLru;

    Object.defineProperty(this, 'enabled', {
        get: function () {
            return lru === activeLru;
        },
        set: function (v) {
            if (v) {
                lru = activeLru = activeLru || new LruCache({
                    max: v.size || 0,
                    maxAge: (v.ttl || 0) * 1000
                });
            } else {
                lru = passiveLru;
            }
        }
    });

    this.enabled = false;

    this.get = function (k) {
        return lru.get(k);
    };

    this.del = function (k) {
        return lru.del(k);
    };

    this.set = function (k, v) {
        return lru.set(k, v);
    };
};

module.exports = LruWrapper;