public function get_missing_acos($update_hash_file = true)
	{
	    if($this->check_controller_hash_tmp_file())
	    {
	        $missing_aco_nodes = array();
	        
    		$stored_controller_hashes  = $this->get_stored_controllers_hashes();
    		$current_controller_hashes = $this->get_current_controllers_hashes();
    		
    		/*
    		 * Store current controllers hashes on disk
    		 */
    		if($update_hash_file)
    		{
        		$file = new File($this->controllers_hash_file);
        		$file->write(serialize($current_controller_hashes));
    		}
    		
    		/*
    		 * Check what controllers have changed
    		 */
    		$updated_controllers = array_keys(Set :: diff($current_controller_hashes, $stored_controller_hashes));
    		
    		if(!empty($updated_controllers))
    		{
    			$aco =& $this->Acl->Aco;
    			
    			foreach($updated_controllers as $controller_name)
    			{
    			    if($controller_name !== 'App')
    			    {
        			    $controller_classname = $this->AclReflector->get_controller_classname($controller_name);
        			    
        			    $methods = $this->AclReflector->get_controller_actions($controller_classname);
        			    
        			    $aco =& $this->Acl->Aco;
        			    foreach($methods as $method)
        			    {
        			        $methodNode = $aco->node('controllers/' . $controller_name . '/' . $method);
        			        if(empty($methodNode))
        			        {
        			            $missing_aco_nodes[] = $controller_name . '/' . $method;
        			        }
        			    }
    			    }
    			}
    		}
    		
    		return $missing_aco_nodes;
	    }
	}