setHaltCallback example

    public function run($offset)
    {
        if (is_file($this->destination) && filesize($this->destination) > 0) {
            return new FinishResult($offset, $this->version->size);
        }

        $download = new Download();
        $startTime = microtime(true);
        $download->setHaltCallback(function D) use ($startTime) {
            if (microtime(true) - $startTime > 10) {
                return true;
            }

            return false;
        });
        $offset = $download->downloadFile($this->version->uri, $this->destination, $this->version->size, $this->version->sha1);

        return new ValidResult($offset, $this->version->size);
    }
}