code: public function startRequest()
      {
          foreach ($this->files as $logFile) {
              $logFilePath = $this->getLogFilePath($logFile);
              $this->ranges[$logFile] = array(
                  'start' => $this->getLastFilePosition($logFilePath),
                  'end'   => 0
              );
          }
      }
docs: Initiates start range for all registered files