// `.TnitOnce`.
func New[T any]() *Cache[T] {
	return &Cache[T]{}
}

// NewFromFunc allocates a new cached value instance and initializes it with an
// update function, making it ready for use.
func NewFromFunc[T any](ttl time.Duration, opts Opts, update func() (T, error)) *Cache[T] {
	return &Cache[T]{
		ttl:      ttl,
		updateFn: update,
		opts:     opts,
	}
}

	BlockSize = "block_size"

	EnvEnable    = "MINIO_CACHE_ENABLE"
	EnvEndpoint  = "MINIO_CACHE_ENDPOINT"
	EnvBlockSize = "MINIO_CACHE_BLOCK_SIZE"
)

// DefaultKVS - default KV config for cache settings
var DefaultKVS = config.KVS{
	config.KV{
		Key:   Enable,
		Value: "off",
	},
	config.KV{
		Key:   Endpoint,
		Value: "",
	},
	config.KV{
		Key:   BlockSize,
		Value: "",
	},
}

)

func TestCache(t *testing.T) {
	cache := New[time.Time]()
	t.Parallel()
	cache.InitOnce(2*time.Second, Opts{},
		func() (time.Time, error) {
			return time.Now(), nil
		},
	)

	t1, _ := cache.Get()

	t2, _ := cache.Get()

	if !t1.Equal(t2) {
		t.Fatalf("expected time to be equal: %s != %s", t1, t2)
	}

	time.Sleep(3 * time.Second)
	t3, _ := cache.Get()

	if t1.Equal(t3) {

)

// metricsCache - cache for metrics.
//
// When serving metrics, this cache is passed to the MetricsLoaderFn.
//
// This cache is used for metrics that would result in network/storage calls.
type metricsCache struct {
	dataUsageInfo       *cachevalue.Cache[DataUsageInfo]
	esetHealthResult    *cachevalue.Cache[HealthResult]
	driveMetrics        *cachevalue.Cache[storageMetrics]

		case "c":
			if dc.IsNil() {
				err = dc.ReadNil()
				if err != nil {
					err = msgp.WrapError(err, "Cache")
					return
				}
				z.Cache = nil
			} else {
				if z.Cache == nil {
					z.Cache = new(dataUsageCache)
				}
				err = z.Cache.DecodeMsg(dc)
				if err != nil {
					err = msgp.WrapError(err, "Cache")
					return
				}
			}
		default:
			err = dc.Skip()
			if err != nil {

	workers *ActiveWorkerStat
	// queue stats cache
	qCache queueCache

	pCache proxyStatsCache
	// mrf backlog stats
	mrfStats ReplicationMRFStats
	// for bucket replication, continue to use existing cache
	Cache             map[string]*BucketReplicationStats
	mostRecentStats   BucketStatsMap
	registry          metrics.Registry
	sync.RWMutex                 // mutex for Cache
	mostRecentStatsMu sync.Mutex // mutex for mostRecentStats

package cache

import (
	"net/http"
	"regexp"
	"strconv"
	"time"

	"github.com/minio/minio/internal/amztime"
	xhttp "github.com/minio/minio/internal/http"
)

//go:generate msgp -file=$GOFILE

// ObjectInfo represents the object information cached remotely
type ObjectInfo struct {
	Key        string    `json:"key"`
	Bucket     string    `json:"bucket"`
	ETag       string    `json:"etag"`
	ModTime    time.Time `json:"modTime"`

	Sleep   time.Duration `json:"sleep"`
	IOCount int           `json:"iocount"`

	DriveWorkers int `json:"drive_workers"`

	// Cached value from Bitrot field
	cache struct {
		// -1: bitrot enabled, 0: bitrot disabled, > 0: bitrot cycle
		bitrotCycle time.Duration
	}
}

// BitrotScanCycle returns the configured cycle for the scanner healing
// -1 for not enabled
//

// it returns true if there is no tags in the underlying Filter.
func (f Filter) TestTags(userTags string) bool {
	if f.cachedTags == nil {
		cache := make(map[string]string)
		for _, t := range append(f.And.Tags, f.Tag) {
			if !t.IsEmpty() {
				cache[t.Key] = t.Value
			}
		}
		f.cachedTags = cache
	}

	// This filter does not have any tags, always return true
	if len(f.cachedTags) == 0 {
		return true
	}

| `minio_node_mem_buffers_max`   | Buffers memory on the node (max).         |
| `minio_node_mem_cache`         | Cache memory on the node.                 |
| `minio_node_mem_cache_avg`     | Cache memory on the node (avg).           |
| `minio_node_mem_cache_max`     | Cache memory on the node (max).           |
| `minio_node_mem_free`          | Free memory on the node.                  |