Gpf_Rpc_Action::addOk PHP Method

        public function addOk($count = 1)
        {
            $this->successCount += $count;
        }

 /**
  *
  * @service export_file delete
  * @param Gpf_Rpc_Params $params
  * @return Gpf_Rpc_Action
  */
 public function deleteFiles(Gpf_Rpc_Params $params)
 {
     $action = new Gpf_Rpc_Action($params);
     $action->setInfoMessage($this->_("File(s) %s was successfully deleted"));
     $action->setErrorMessage($this->_("Could not delete %s file(s)"));
     foreach ($action->getIds() as $id) {
         try {
             $export = new Gpf_Db_Export();
             $export->setPrimaryKeyValue($id);
             $export->load();
             $fileName = $export->getFileName();
             $export->delete();
         } catch (Exception $e) {
             $action->addError();
             continue;
         }
         $filePath = Gpf_Paths::getInstance()->getAccountDirectoryPath() . Gpf_Csv_ImportExportService::EXPORT_DIRECTORY . $fileName;
         $file = new Gpf_Io_File($filePath);
         if ($file->isExists()) {
             if ($file->delete()) {
                 $action->addOk();
             } else {
                 $action->addError();
             }
         } else {
             $action->addOk();
         }
     }
     return $action;
 }