gistfile1.js

function orderedFlow ( order ) {
  this.order = order;
  this.listnerId = uuid('orderedFlow.');
  this.dataStack = [];
  this.index = 0;
  this.interval = 0;
  this.maxListen= 500;  

  this.nextTime = 0;
  this.timeout  = undefined;

  var self = this;
  this.listner  =  function(e,data){
    if(e.timestamp < this.nextTime ){
      return;
    }
    if( self.timeout != undefined && e.timestamp > self.timeout ){
      self.reset();
    }
    if(e.type == self.order[self.index]){
      self.index ++;
      self.nextTime = e.timestamp + self.interval;
      self.dataStack.push(data);
    } else {
      self.reset();
    }
    if( self.order[self.index] == undefined){
      flow.fire(self.dataStack);
      self.reset();
    }
  }
 this.order.forEach(function(name){
    flow.on(name,self.listner);
  });
  this.reset();
};

ofproto = orderedFlow.prototype;

ofproto.bind = function(cb){
  flow.on(this.listnerId,cb);
  return this;
};

ofproto.once = function(cb){
  flow.on(this.listnerId,cb);
  return this;
};

ofproto.unbind =function(){
  this.order.forEach(function(name){
    flow.unbind(name);
  });
};

ofproto.reset = function(){
  this.index = 0;
  this.nextTime = 0;
  this.timeout  = undefined;
  this.dataStack= [];
};

a order flow implement