I am using mem.js<\/a> as client library for accessing memcached. To use it, the first thing to do is to add the requirement to your package.json:<\/p>\n Then we can create a simple helper class to have an abstraction layer between our code and the library itself.<\/p>\n 1. Create a folder in \/app<\/em> named classes<\/em><\/p>\n 2. Create a new file with the name MemcachedFactory.js<\/em><\/p>\n 3. Add the following code:<\/p>\n 5. To use the class in our code, we have to add the requirement first:<\/p>\n 6. Here is a small example how the class is used:<\/p>\n The getInstance<\/em> method returns an instance of the class. Then the get<\/em> method is used with the key to retreive, and a callback method which is called when the request to memcached is completed.<\/p>\n The set<\/em> method allows to put a key to memcached, and with ttl we can define how long the key is valid and stored.<\/p>\n","protected":false},"excerpt":{"rendered":" mem.js I am using mem.js as client library for accessing memcached. To use it, the first thing to do is to add the requirement to your package.json: npm install memjs –save MemcachedFactory Then we can create a simple helper class … Weiterlesen npm install memjs --save<\/code><\/pre>\nMemcachedFactory<\/h2>\n
const memjs = require('memjs');\r\n\/**\r\n * Helper class for using Memcache\r\n * \r\n * @author Sven Hasselbach\r\n * @version 0.1\r\n *\/\r\nclass MemcachedFactory {\r\n\r\n constructor() {\r\n this.client = memjs.Client.create('127.0.0.1:11211');\r\n }\r\n\r\n \/**\r\n * returns a single instance of the class\r\n *\/\r\n static getInstance() {\r\n if (this.instance == null) {\r\n this.instance = new MemcachedFactory();\r\n }\r\n return this.instance;\r\n }\r\n\r\n \/**\r\n * stores a value in memcache\r\n * @param {string} key \r\n * the key used\r\n * @param {*} value\r\n * the value to store\r\n * @param {number} ttl \r\n * time-to-live in seconds\r\n *\/\r\n set(key, value, ttl) {\r\n this.client.set(key, value, { expires: ttl }, err => {\r\n if (err) {\r\n console.log(err);\r\n throw err;\r\n }\r\n });\r\n }\r\n \/**\r\n * gets a value from memcache\r\n * \r\n * @param {string} key \r\n * the key used\r\n * @param {function} callback\r\n * the callback containing the value\r\n *\/\r\n get(key, callback) {\r\n this.client.get(key, (err, value) => {\r\n if (err) {\r\n console.error(err);\r\n callback(err);\r\n }\r\n if (value == null) {\r\n callback(err, null);\r\n } else {\r\n callback(err, value.toString());\r\n }\r\n });\r\n }\r\n}\r\nmodule.exports = MemcachedFactory;<\/code><\/pre>\nconst mf = require('..\/classes\/MemcachedFactory');<\/code><\/pre>\nmf.getInstance().get(key, (error, value) => {\r\n if (error) {\r\n \/\/ handle error here\r\n }else{\r\n \/\/ we have a value\r\n console.log(`The value is ${value}`); \r\n }\r\n});<\/code><\/pre>\n