/**
* Executes a closure with a temporary read preference on a database or
* collection.
*
* @param Database|Collection $object
* @param \Closure $closure
* @return mixed
*/
private function withReadPreference($object, \Closure $closure)
{
if (!isset($this->query['readPreference'])) {
return $closure();
}
$prevReadPref = $object->getReadPreference();
$object->setReadPreference($this->query['readPreference'], $this->query['readPreferenceTags']);
try {
$result = $closure();
} catch (\Exception $e) {
}
$prevTags = !empty($prevReadPref['tagsets']) ? $prevReadPref['tagsets'] : null;
$object->setReadPreference($prevReadPref['type'], $prevTags);
if (isset($e)) {
throw $e;
}
return $result;
}