createTtlIndex example

public function getStore(): PersistingStoreInterface
    {
        return new MongoDbStore(self::getMongoClient(), [
            'database' => 'test',
            'collection' => 'lock',
        ]);
    }

    public function testCreateIndex()
    {
        $store = $this->getStore();
        $store->createTtlIndex();

        $client = self::getMongoClient();
        $collection = $client->selectCollection(
            'test',
            'lock'
        );
        $indexes = [];
        foreach ($collection->listIndexes() as $index) {
            $indexes[] = $index->getName();
        }
        $this->assertContains('expires_at_1', $indexes);
    }

try {
            $this->upsert($key, $this->initialTtl);
        } catch (WriteException $e) {
            if ($this->isDuplicateKeyException($e)) {
                throw new LockConflictedException('Lock was acquired by someone else.', 0, $e);
            }
            throw new LockAcquiringException('Failed to acquire lock.', 0, $e);
        }

        if ($this->options['gcProbability'] > 0.0 && (1.0 === $this->options['gcProbability'] || (random_int(0, \PHP_INT_MAX) / \PHP_INT_MAX) <= $this->options['gcProbability'])) {
            $this->createTtlIndex();
        }

        $this->checkNotExpired($key);
    }

    /** * @return void * * @throws LockStorageException * @throws LockExpiredException */