/**
* Release a lock that was previously obtained with @lock.
* @param lock $lock - a lock obtained from this factory.
* @return boolean - true if the lock is no longer held (including if it was never held).
*/
public function release_lock(lock $lock)
{
$params = array('locktype' => $this->dblockid, 'token' => $lock->get_key());
$result = $this->db->get_record_sql('SELECT pg_advisory_unlock(:locktype, :token) AS unlocked', $params);
$result = $result->unlocked === 't';
if ($result) {
unset($this->openlocks[$lock->get_key()]);
}
return $result;
}
/**
* Extend a lock that was previously obtained with @lock.
* @param lock $lock - a lock obtained from this factory.
* @param int $maxlifetime - the new lifetime for the lock (in seconds).
* @return boolean - true if the lock was extended.
*/
public function extend_lock(lock $lock, $maxlifetime = 86400)
{
$now = time();
$expires = $now + $maxlifetime;
$params = array('expires' => $expires, 'token' => $lock->get_key());
$sql = 'UPDATE {lock_db}
SET
expires = :expires,
WHERE
owner = :token';
$this->db->execute($sql, $params);
$countparams = array('owner' => $lock->get_key());
$result = $this->count_records('lock_db', $countparams);
return $result === 0;
}
/**
* Release a lock that was previously obtained with @lock.
* @param lock $lock - A lock obtained from this factory.
* @return boolean - true if the lock is no longer held (including if it was never held).
*/
public function release_lock(lock $lock)
{
$handle = $lock->get_key();
if (!$handle) {
// We didn't have a lock.
return false;
}
$result = flock($handle, LOCK_UN);
fclose($handle);
return $result;
}
