memcached-multiplex

combine concurrent gets for the same keys into one get/multiget to the server

// first you need memcached. (or something that implements the methods get and getMulti)varMemcached=require('memcached');varmulti=require('memcache-multiplex');vargetter=multi(newMemcached('127.0.0.1:11211'));// all of these callsgetter.get('hi',function(err,v){console.log('the value of hi',v)})getter.get('hi',function(err,v){console.log('the value of hi',v)})getter.get('hi',function(err,v){console.log('the value of hi',v)})// make only one call to the memcache server// get a,bgetter.getMulti(['a','b'],function(){});// get c but not b because im alredy fetching bgetter.getMulti(['b','c'],function(){});// no call is made im already requesting the keys im searching for.getter.getMulti(['a','c'],function(){});// triggers 2 "getMulti" on the client driver.// one for keys ['a','b'] and one for just key ['c']

multi = require('memcached-multiplex')(new Memcached(hosts));

• this module exports a function
• if you call this function with a memcached client you will get an object with getter methods

.get(key,cb)

gets the key

.getMulti([key, key2],cb)

get multiple keys

.stats

• stats is an object

• it has stats that help you determine how well you are multiplexing

• get

  • keys , how many single keys were requested from the memcached server
  • calls, how many keys were requested by calls to the function

• multi

  • keys, how many keys were requested from the memcached server
  • requested, how many keys were requested by calls to getMulti
  • calls, how many calls to getMulti
  • made, how many calls to get multi resulted in fetching keys from the memcached server

{get:{keys:0,calls:0},multi:{keys:0,requested:0,calls:0,made:0}}

rant! if you use node you should not make multiple concurrent gets for the same external resources. this applies to databases web services whatever.