/**
* Acquires a lock on the item table
*
* @return bool True if the lock was acquired, false if it has been acquired previously
*
* @throws \RuntimeException If the lock could not be acquired
*/
protected function acquire_lock()
{
if ($this->lock->owns_lock()) {
return false;
}
if (!$this->lock->acquire()) {
throw new \RuntimeException($this->message_prefix . 'LOCK_FAILED_ACQUIRE');
}
return true;
}
