SyncInterval

syncTimer.js

/**
 * Created with JetBrains WebStorm.
 * User: Den
 * Date: 25.01.14
 * Time: 23:52
 * To change this template use File | Settings | File Templates.
 */



var
   timersArr = [],
   cnt = 0;

function Timer(interval,callback){
    this.id = Date.now()+''+(cnt++);
    this.interval = interval;
    this.callback = callback;
    timersArr.push(this);
    if(timersArr.length==1) timer();
}

function checkTimers(){
   var
       i=timersArr.length,
       ct = process.hrtime(),
       ms = Math.floor(ct[1]/1000000),
       ctm, ost;
   while(i--){
       ctm = timersArr[i];
       ost = ms%ctm.interval;
       if((!ost) && (ctm.last!=ms)) {
           ctm.callback.call(this);
           ctm.last = ms;
       }
   }
}

function timer(){
    checkTimers();
    if(timersArr.length) setImmediate(timer);
}


exports.setSyncInterval = function(callback,interval){
    var t =  new Timer(interval,callback);
    return t.id;
}

exports.clearSyncInterval = function(id){
    var idx;
    timersArr.some(function(t,i){
        if(t.id==id){
            idx = i;
        }
    });
    if(idx>=0){
        timersArr.splice(idx,1);
    }
}