if k.QueueDir == "" {
			return errors.New("batch should be enabled only if queue dir is enabled")
		}
	}
	return nil
}

// KafkaTarget - Kafka target.
type KafkaTarget struct {
	initOnce once.Init

	id         event.TargetID
	args       KafkaArgs
	client     sarama.Client
	producer   sarama.SyncProducer
	config     *sarama.Config
	store      store.Store[event.Event]

	}

	return stan.Connect(n.Streaming.ClusterID, clientID, connOpts...)
}

// NATSTarget - NATS target.
type NATSTarget struct {
	initOnce once.Init

	id         event.TargetID
	args       NATSArgs
	natsConn   *nats.Conn
	stanConn   stan.Conn
	jstream    nats.JetStream
	store      store.Store[event.Event]
	loggerOnce logger.LogOnce

// in the slices returned.
func hashOrder(key string, cardinality int) []int {
	if cardinality <= 0 {
		// Returns an empty int slice for cardinality < 0.
		return nil
	}

	nums := make([]int, cardinality)
	keyCrc := crc32.Checksum([]byte(key), crc32.IEEETable)

	start := int(keyCrc % uint32(cardinality))
	for i := 1; i <= cardinality; i++ {

	sys.Unlock()

	return meta, true, nil
}

// Init - initializes bucket metadata system for all buckets.
func (sys *BucketMetadataSys) Init(ctx context.Context, buckets []BucketInfo, objAPI ObjectLayer) error {
	if objAPI == nil {
		return errServerNotInitialized
	}

	sys.objAPI = objAPI

	// Load bucket metadata sys.
	sys.init(ctx, buckets)
	return nil
}

// which will eventually replace the current target.
func (h *Target) AssignMigrateTarget(migrateTgt *Target) {
	h.migrateTarget = migrateTgt
}

// Init validate and initialize the http target
func (h *Target) Init(ctx context.Context) (err error) {
	if h.config.QueueDir != "" {
		return h.initQueueOnce.DoWithContext(ctx, h.initDiskStore)
	}
	return h.initQueueOnce.DoWithContext(ctx, h.initMemoryStore)

		})

		// Initialize site replication manager after bucket metadata
		bootstrapTrace("globalSiteReplicationSys.Init", func() {
			globalSiteReplicationSys.Init(GlobalContext, newObject)
		})

		// Initialize quota manager.
		bootstrapTrace("globalBucketQuotaSys.Init", func() {
			globalBucketQuotaSys.Init(newObject)
		})

		// Populate existing buckets to the etcd backend
		if globalDNSConfig != nil {

	}

	if m.MaxOpenConnections < 0 {
		return errors.New("maxOpenConnections cannot be less than zero")
	}

	return nil
}

// MySQLTarget - MySQL target.
type MySQLTarget struct {
	initOnce once.Init

	id         event.TargetID
	args       MySQLArgs
	updateStmt *sql.Stmt
	deleteStmt *sql.Stmt
	insertStmt *sql.Stmt
	db         *sql.DB
	store      store.Store[event.Event]
	firstPing  bool

		return errors.New("username and password should be set in pairs")
	}

	return nil
}

// ElasticsearchTarget - Elasticsearch target.
type ElasticsearchTarget struct {
	initOnce once.Init

	id         event.TargetID
	args       ElasticsearchArgs
	client     esClient
	store      store.Store[event.Event]
	loggerOnce logger.LogOnce
	quitCh     chan struct{}
}

	mu        sync.Mutex
	init      sync.Once
	lastMinuteLatency
}

func (e *lockedLastMinuteLatency) add(value time.Duration) {
	e.addSize(value, 0)
}

// addSize will add a duration and size.
func (e *lockedLastMinuteLatency) addSize(value time.Duration, sz int64) {
	// alloc on every call, so we have a clean entry to swap in.
	t := time.Now().Unix()
	e.init.Do(func() {
		e.cached.Store(&AccElem{})

	baseTestCases := []TestSuiteCommon{
		// Init and run test on ErasureSD backend with signature v4.
		{serverType: "ErasureSD", signer: signerV4},
		// Init and run test on ErasureSD backend, with tls enabled.
		{serverType: "ErasureSD", signer: signerV4, secure: true},
		// Init and run test on Erasure backend.
		{serverType: "Erasure", signer: signerV4},
		// Init and run test on ErasureSet backend.