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)
var Memcached = require('memcached');
var multi = require('memcache-multiplex');
 
var getter = multi(new Memcached('127.0.0.1:11211'));
 
// all of these calls
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)
})
 
getter.get('hi',function(err,v){
  console.log('the value of hi',v)
})
 
// make only one call to the memcache server
 
// get a,b
getter.getMulti(['a','b'],function(){
 
});
 
// get c but not b because im alredy fetching b
getter.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.