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$filePath = $file->getRealPath(); // 1
$runFilePath = $filePath . '.run';  // 2
// Renaming to lock the file
if (false === rename($filePath, $runFilePath)) { // 3
  throw new \RuntimeException('Renaming from ' . $filePath . ' to ' . $runFilePath . ' failed.');
}

$lockFile = $this->directory . '/' . '.lockfile';
$lockHandle = fopen($lockFile, 'c+b');
if ($lockHandle === false) {
  throw new \RuntimeException('Cannot create the lockfile for task directory');
}
$lock = flock($lockHandle, LOCK_EX);  
// ...
flock($lockHandle, LOCK_UN);

protected function createIterator()
{
  $directoryIterator = new \DirectoryIterator($this->directory);
  return new \CallbackFilterIterator($directoryIterator, function($fileInfo) {
        return strpos($fileInfo->getFileName(), '.') !== 0;
  });
}