IsOnline(ctx context.Context) bool
	Cancel()
	Send(ctx context.Context, entry interface{}) error
	Type() types.TargetType
}

type targetsList struct {
	list []Target
	mu   sync.RWMutex
}

func newTargetsList() *targetsList {
	return &targetsList{}
}

func (tl *targetsList) get() []Target {
	tl.mu.RLock()
	defer tl.mu.RUnlock()

	return tl.list
}

	ngh.handlers = append(ngh.handlers, h)
}

func (ngh *NetworkGatewaysHandler) NotifyGatewayHandlers() {
	for _, handler := range ngh.handlers {
		handler()
	}
}

type NetworkGateways struct {
	mu *sync.RWMutex
	// least common multiple of gateway number of {per network, per cluster}
	lcm                 uint32
	byNetwork           map[network.ID][]NetworkGateway
	byNetworkAndCluster map[networkAndCluster][]NetworkGateway
}

package filewatcher

import (
	"bufio"
	"bytes"
	"crypto/sha256"
	"fmt"
	"io"
	"os"
	"sync"

	"github.com/fsnotify/fsnotify"
)

type worker struct {
	mu sync.RWMutex

	// watcher is an fsnotify watcher that watches the parent
	// dir of watchedFiles.
	dirWatcher *fsnotify.Watcher

	// The worker maintains a map of channels keyed by watched file path.

// Therefore no cluster locks are required.
var localMetacacheMgr = &metacacheManager{
	buckets: make(map[string]*bucketMetacache),
	trash:   make(map[string]metacache),
}

type metacacheManager struct {
	mu      sync.RWMutex
	init    sync.Once
	buckets map[string]*bucketMetacache
	trash   map[string]metacache // Recently deleted lists.
}

const metacacheMaxEntries = 5000

// initManager will start async saving the cache.

	// data is cached and fetched remotely from DRAM.
	BlockSize int64

	// Is the HTTP client used for communicating with mcache server
	clnt *http.Client
}

var configLock sync.RWMutex

// Enabled - indicates if cache is enabled or not
func (c *Config) Enabled() bool {
	return c.Enable && c.Endpoint != ""
}

// MatchesSize verifies if input 'size' falls under cacheable threshold

	}
	c = Config{
		Enabled:            false,
		arnProviderCfgsMap: map[arn.ARN]*providerCfg{},
		ProviderCfgs:       map[string]*providerCfg{},
		pubKeys: publicKeys{
			RWMutex: &sync.RWMutex{},
			pkMap:   map[string]interface{}{},
		},
		roleArnPolicyMap: map[arn.ARN]string{},
		transport:        openIDClientTransport,
		closeRespFn:      closeRespFn,
	}

	resourceMetricsMapMu sync.RWMutex
	// resourceMetricsHelpMap maps metric name to its help string
	resourceMetricsHelpMap map[MetricName]string
	resourceMetricsGroups  []*MetricsGroupV2
	// initial values for drives (at the time  of server startup)
	// used for calculating avg values for drive metrics
	latestDriveStats      map[string]madmin.DiskIOStats
	latestDriveStatsMu    sync.RWMutex
	lastDriveStatsRefresh time.Time
)

	// Name of bucket
	bucket string

	// caches indexed by id.
	caches map[string]metacache
	// cache ids indexed by root paths
	cachesRoot map[string][]string `msg:"-"`

	// Internal state
	mu      sync.RWMutex `msg:"-"`
	updated bool         `msg:"-"`
}

type deleteAllStorager interface {
	deleteAll(ctx context.Context, bucket, prefix string)
}

// newBucketMetacache creates a new bucketMetacache.

	"github.com/minio/minio/internal/pubsub"
	"github.com/minio/pkg/v3/policy"
)

// EventNotifier - notifies external systems about events in MinIO.
type EventNotifier struct {
	sync.RWMutex
	targetList     *event.TargetList
	bucketRulesMap map[string]event.RulesMap
}

// NewEventNotifier - creates new event notification object.
func NewEventNotifier(ctx context.Context) *EventNotifier {

	// until the next call to Set (which causes the GC to run).
	// It may not be changed concurrently with calls to Get.
	AllowExpiredGet bool

	clock clock.Clock

	// mu protects the below fields
	mu sync.RWMutex
	// cache is the internal map that backs the cache.
	cache map[interface{}]entry
	// generation is used as a cheap resource version for cache entries. Cleanups