private method scoping

lib/query-chainer.js

 var Utils = require("./utils")
 var Utils = require("./utils")
 
 
-var QueryChainer = module.exports = function(emitters) {
+module.exports = (function() {
+  var QueryChainer = function(emitters) {
     var self = this
     var self = this
 
 
     this.finishedEmits = 0
     this.finishedEmits = 0
@@ -12,40 +13,48 @@ var QueryChainer = module.exports = function(emitters) {
 
 
     emitters = emitters || []
     emitters = emitters || []
     emitters.forEach(function(emitter) { self.add(emitter) })
     emitters.forEach(function(emitter) { self.add(emitter) })
-}
-Utils.addEventEmitter(QueryChainer)
+  }
+  Utils.addEventEmitter(QueryChainer)
 
 
-QueryChainer.prototype.add = function(emitter) {
-  this.observeEmitter(emitter)
+  QueryChainer.prototype.add = function(emitter) {
+    observeEmitter.call(this, emitter)
     this.emitters.push(emitter)
     this.emitters.push(emitter)
     return this
     return this
-}
-QueryChainer.prototype.observeEmitter = function(emitter) {
+  }
+
+  QueryChainer.prototype.run = function() {
+    var self = this
+    this.eventEmitter = new Utils.CustomEventEmitter(function() {
+      self.runned = true
+      finish.call(self)
+    })
+    return this.eventEmitter.run()
+  }
+
+  // private
+
+  var observeEmitter = function(emitter) {
     var self = this
     var self = this
     emitter
     emitter
       .on('success', function(){
       .on('success', function(){
         self.finishedEmits++
         self.finishedEmits++
-      self.finish()
+        finish.call(self)
       })
       })
       .on('failure', function(err){
       .on('failure', function(err){
         self.finishedEmits++
         self.finishedEmits++
         self.fails.push(err)
         self.fails.push(err)
-      self.finish()
+        finish.call(self)
       })
       })
-}
-QueryChainer.prototype.finish = function(result) {
+  }
+
+  var finish = function(result) {
     this.finished = (this.finishedEmits == this.emitters.length)
     this.finished = (this.finishedEmits == this.emitters.length)
     if(this.finished && this.runned) {
     if(this.finished && this.runned) {
       var status = this.fails.length == 0 ? 'success' : 'failure'
       var status = this.fails.length == 0 ? 'success' : 'failure'
       result = this.fails.length == 0 ? result : this.fails
       result = this.fails.length == 0 ? result : this.fails
       this.eventEmitter.emit(status, result)
       this.eventEmitter.emit(status, result)
     }
     }
-}
-QueryChainer.prototype.run = function() {
-  var self = this
-  this.eventEmitter = new Utils.CustomEventEmitter(function() {
-    self.runned = true
-    self.finish()
-  })
-  return this.eventEmitter.run()
-}
+  }
+
+  return QueryChainer
+})()
\ No newline at end of file