type QueueStore[_ any] struct {
	sync.RWMutex
	entryLimit uint64
	directory  string
	fileExt    string

	entries map[string]int64 // key -> modtime as unix nano
}

// NewQueueStore - Creates an instance for QueueStore.
func NewQueueStore[I any](directory string, limit uint64, ext string) *QueueStore[I] {
	if limit == 0 {
		limit = defaultLimit
	}

	if ext == "" {
		ext = defaultExt
	}

	return &QueueStore[I]{

		return err
	}
	go h.startKafkaLogger()
	return nil
}

func (h *Target) initQueueStore(ctx context.Context) (err error) {
	queueDir := filepath.Join(h.kconfig.QueueDir, h.Name())
	queueStore := store.NewQueueStore[any](queueDir, uint64(h.kconfig.QueueSize), kafkaLoggerExtension)
	if err = queueStore.Open(); err != nil {
		return fmt.Errorf("unable to initialize the queue store of %s webhook: %w", h.Name(), err)
	}

	var queueStore store.Store[event.Event]
	if args.QueueDir != "" {
		queueDir := filepath.Join(args.QueueDir, storePrefix+"-amqp-"+id)
		queueStore = store.NewQueueStore[event.Event](queueDir, args.QueueLimit, event.StoreExtension)
		if err := queueStore.Open(); err != nil {
			return nil, fmt.Errorf("unable to initialize the queue store of AMQP `%s`: %w", id, err)
		}
	}

	var queueStore store.Store[event.Event]
	if args.QueueDir != "" {
		queueDir := filepath.Join(args.QueueDir, storePrefix+"-elasticsearch-"+id)
		queueStore = store.NewQueueStore[event.Event](queueDir, args.QueueLimit, event.StoreExtension)
		if err := queueStore.Open(); err != nil {
			return nil, fmt.Errorf("unable to initialize the queue store of Elasticsearch `%s`: %w", id, err)
		}
	}

	// Ext for test item
	testItemExt = ".test"
)

// Initialize the queue store.
func setUpQueueStore(directory string, limit uint64) (Store[TestItem], error) {
	queueStore := NewQueueStore[TestItem](queueDir, limit, testItemExt)
	if oErr := queueStore.Open(); oErr != nil {
		return nil, oErr
	}
	return queueStore, nil
}

// Tear down queue store.
func tearDownQueueStore() error {

	ctx, cancel := context.WithCancel(ctx)
	h.storeCtxCancel = cancel
	h.lastStarted = time.Now()
	go h.startQueueProcessor(ctx, true)

	queueStore := store.NewQueueStore[any](
		filepath.Join(h.config.QueueDir, h.Name()),
		uint64(h.config.QueueSize),
		httpLoggerExtension,
	)

	if err := queueStore.Open(); err != nil {