function PostgreSqlStore::saveRead

Overrides SharedLockStoreInterface::saveRead

File

vendor/symfony/lock/Store/PostgreSqlStore.php, line 102

Class

PostgreSqlStore

PostgreSqlStore is a PersistingStoreInterface implementation using PostgreSql advisory locks.

Namespace

Symfony\Component\Lock\Store

Code

public function saveRead(Key $key) : void {
    // prevent concurrency within the same connection
    $this->getInternalStore()
        ->saveRead($key);
    $lockAcquired = false;
    try {
        $sql = 'SELECT pg_try_advisory_lock_shared(:key)';
        $stmt = $this->getConnection()
            ->prepare($sql);
        $stmt->bindValue(':key', $this->getHashedKey($key));
        $result = $stmt->execute();
        // Check if lock is acquired
        if (true === $stmt->fetchColumn()) {
            $key->markUnserializable();
            // release lock in case of demotion
            $this->unlock($key);
            $lockAcquired = true;
            return;
        }
    } finally {
        if (!$lockAcquired) {
            $this->getInternalStore()
                ->delete($key);
        }
    }
    throw new LockConflictedException();
}