hh

type Service interface {

	// Start the hinted handoff service.
	Start() error

	// Stop the hinted handoff service.
	Stop()

	// Name returns the underlying implementation name.
	Name() string

	// Append add key/value byte slice to end of the buffer.
	Append(cluster, topic string, key, value []byte) error

	// Empty returns whether the buffer has no inflight entries.
	Empty(cluster, topic string) bool

	// FlushInflights flush all inflight entries inside buffer to final message storage.
	FlushInflights()

	// Inflights() returns all queues inflights messages count total.
	Inflights() int64

	// AppendN returns all queues successfully appended messages count total.
	AppendN() int64

	// DeliverN returns all queues successfully delivered messages count total.
	DeliverN() int64

	// ResetCounters reset AppendN and DeliverN to 0.
	ResetCounters()
}