const (
	transitionWorkers = "transition_workers"
	expirationWorkers = "expiration_workers"
	// EnvILMTransitionWorkers env variable to configure number of transition workers
	EnvILMTransitionWorkers = "MINIO_ILM_TRANSITION_WORKERS"
	// EnvILMExpirationWorkers env variable to configure number of expiration workers
	EnvILMExpirationWorkers = "MINIO_ILM_EXPIRATION_WORKERS"
)

var (
	defaultHelpPostfix = func(key string) string {

	es := newExpiryState(context.Background(), objAPI, 0)
	workers := []chan expiryOp{make(chan expiryOp)}
	es.workers.Store(&workers)
	globalExpiryState = es
	var wg sync.WaitGroup
	wg.Add(1)
	expired := make([]ObjectToDelete, 0, 5)
	go func() {
		defer wg.Done()
		workers := globalExpiryState.workers.Load()
		for t := range (*workers)[0] {
			if t, ok := t.(newerNoncurrentTask); ok {

		config.HelpKV{
			Key:         apiReplicationMaxWorkers,
			Description: `set the maximum number of replication workers` + defaultHelpPostfix(apiReplicationMaxWorkers),
			Optional:    true,
			Type:        "number",
		},
		config.HelpKV{
			Key:         apiTransitionWorkers,
			Description: `set the number of transition workers` + defaultHelpPostfix(apiTransitionWorkers),
			Optional:    true,
			Type:        "number",
		},

			Optional:    true,
			Type:        "int",
		},
		config.HelpKV{
			Key:         DriveWorkers,
			Description: `the number of workers per drive to heal a new disk replacement` + defaultHelpPostfix(DriveWorkers),
			Optional:    true,
			Type:        "int",
		},
	}

		return true
	case emptySHA256:
		// some broken clients set empty-sha256
		// with > 0 content-length in the body,
		// we should skip such clients and allow
		// blindly such insecure clients only if
		// S3 strict compatibility is disabled.

		// We return true only in situations when
		// deployment has asked MinIO to allow for
		// such broken clients and content-length > 0.

	EnvMQTTQueueLimit        = "MINIO_NOTIFY_MQTT_QUEUE_LIMIT"
)

// MQTTArgs - MQTT target arguments.
type MQTTArgs struct {
	Enable               bool           `json:"enable"`
	Broker               xnet.URL       `json:"broker"`
	Topic                string         `json:"topic"`
	QoS                  byte           `json:"qos"`
	User                 string         `json:"username"`

					return
				}
			}
		}()
	}
	wk.Wait()
}

var startOnce sync.Once

// Init initialize target send workers.
func (list *TargetList) Init(workers int) *TargetList {
	startOnce.Do(func() {
		go list.startSendWorkers(workers)
	})
	return list
}

// NewTargetList - creates TargetList.
func NewTargetList(ctx context.Context) *TargetList {
	list := &TargetList{

			Optional:    true,
			Type:        "sentence",
		},
	}

	HelpKafka = config.HelpKVS{
		config.HelpKV{
			Key:         KafkaBrokers,
			Description: "comma separated list of Kafka broker addresses",
			Type:        "csv",
		},
		config.HelpKV{
			Key:         KafkaTopic,
			Description: "Kafka topic used for bucket notifications",
			Optional:    true,
			Type:        "string",
		},

const (
	Bitrot       = "bitrotscan"
	Sleep        = "max_sleep"
	IOCount      = "max_io"
	DriveWorkers = "drive_workers"

	EnvBitrot       = "MINIO_HEAL_BITROTSCAN"
	EnvSleep        = "MINIO_HEAL_MAX_SLEEP"
	EnvIOCount      = "MINIO_HEAL_MAX_IO"
	EnvDriveWorkers = "MINIO_HEAL_DRIVE_WORKERS"
)

var configMutex sync.RWMutex

// Config represents the heal settings.
type Config struct {

	current      [][]string       // current block of results to be returned
	recordsRead  int              // number of records read in current slice
	input        chan *queueItem  // input for workers
	queue        chan *queueItem  // output from workers in order
	err          error            // global error state, only touched by Reader.Read
	bufferPool   sync.Pool        // pool of []byte objects for input