fix: update state function

updatestate should not change the order of workers in the tmpPool
 remove code repeatation

fix: actual concurrent tasks running was concurrency-1. fixed by placing cb after returnTOPool at $doWork_ functions

src/JobManager.js

@@ -22,6 +22,8 @@ function JobManager(opts){
     this.isLoadingTakingPlace = false;
     this.endReached = false;
     this.runningTasks = 0;
+    this.tmpPoolLen=0;
+    this.tmpPool = [];
 }
 /*
  * JobManager.prototype.__defineSetter__( 'workers', function(workers){
@@ -31,18 +33,10 @@ function JobManager(opts){
  */
 
 JobManager.prototype.updateState = function(){
-    var workers = this.workers;
-    var tmpPoolBlock = workers.length &&  Math.ceil( this.concurrency/workers.length ) , i;
-    var tmpPool = [];
-    for( i=0; i < tmpPoolBlock; i++){
-        tmpPool = tmpPool.concat( this.workers );
-    }
-    this.tmpPool = tmpPool;
-    this.tmpPoolLen = tmpPoolBlock * this.workers.length ;
+    this.updateTmpPool( this.concurrency );
 };
 
-JobManager.prototype.setConcurrency = function( newVal ){
-    if( newVal > this.minConcurrency ){
+JobManager.prototype.updateTmpPool = function(newVal){
     if( newVal > this.tmpPoolLen ){
         var tmpPool = this.tmpPool;
         var additionalPoolBlocks = Math.ceil( ( newVal - this.tmpPoolLen )/this.workers.length ), i;
@@ -50,7 +44,13 @@ JobManager.prototype.setConcurrency = function( newVal ){
             tmpPool = tmpPool.concat( this.workers );
         }
         this.tmpPoolLen += additionalPoolBlocks * this.workers.length ;
+        this.tmpPool = tmpPool;
     }
+};
+
+JobManager.prototype.setConcurrency = function( newVal ){
+    if( newVal > this.minConcurrency ){
+        this.updateTmpPool(newVal);
         this.concurrency = newVal;
     }
 };
@@ -90,11 +90,11 @@ JobManager.prototype.$doWork_ = function( cb ){
                 self.$onLoadMore();
             }
         }
-        cb();
         if( self.state == STATE.NOT_RUNNING  ){
             if( ( self.runningTasks == 1 ) &&  self.onStopped ) { self.onStopped(); }
         }
         self.returnToPool( worker );
+        cb();
     });
 };