)

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]

// dataUsageCacheV2 contains a cache of data usage entries version 2.
type dataUsageCacheV2 struct {
	Info  dataUsageCacheInfo
	Cache map[string]dataUsageEntryV2
}

// dataUsageCacheV3 contains a cache of data usage entries version 3.
type dataUsageCacheV3 struct {
	Info  dataUsageCacheInfo
	Cache map[string]dataUsageEntryV3
}

// dataUsageCacheV4 contains a cache of data usage entries version 4.

			b.debugf("cache %s not worth keeping", id)
			remove[id] = struct{}{}
			continue
		}
		if cache.id != id {
			logger.Info("cache ID mismatch %s != %s", id, cache.id)
			remove[id] = struct{}{}
			continue
		}
		if cache.bucket != b.bucket {
			logger.Info("cache bucket mismatch %s != %s", b.bucket, cache.bucket)
			remove[id] = struct{}{}
			continue
		}
	}

			err := iamOS.loadMappedPolicy(ctx, svcParent, stsUser, false, cache.iamSTSPolicyMap)
			if err != nil && !errors.Is(err, errNoSuchPolicy) {
				return fmt.Errorf("unable to load the policy mapping for the STS user `%s`: %w", svcParent, err)
			}
		}
	}
	// Copy svcUsersMap to cache.iamUsersMap
	for k, v := range svcUsersMap {
		cache.iamUsersMap[k] = v
	}

	cache.buildUserGroupMemberships()
	return nil
}

	s := o.Marker
	if !strings.Contains(s, "[minio_cache:"+markerTagVersion) {
		return
	}
	start := strings.LastIndex(s, "[")
	o.Marker = s[:start]
	end := strings.LastIndex(s, "]")
	tag := strings.Trim(s[start:end], "[]")
	tags := strings.Split(tag, ",")
	for _, tag := range tags {
		kv := strings.Split(tag, ":")
		if len(kv) < 2 {
			continue
		}
		switch kv[0] {
		case "minio_cache":
			if kv[1] != markerTagVersion {

	// returned by these functions must be present in the `Descriptors` list.
	loader       MetricsLoaderFn
	bucketLoader BucketMetricsLoaderFn

	// Cache for all metrics groups. Set via `.SetCache` method.
	cache *metricsCache

	// managed values follow:

	// map of metric descriptors by metric name.
	descriptorMap map[MetricName]MetricDescriptor

package cmd

import (
	"errors"
	"io"

	sse "github.com/minio/minio/internal/bucket/encryption"
)

// BucketSSEConfigSys - in-memory cache of bucket encryption config
type BucketSSEConfigSys struct{}

// NewBucketSSEConfigSys - Creates an empty in-memory bucket encryption configuration cache
func NewBucketSSEConfigSys() *BucketSSEConfigSys {
	return &BucketSSEConfigSys{}
}

					return
				default:
				}

				// Load cache for bucket
				cacheName := pathJoin(bucket.Name, dataUsageCacheName)
				cache := dataUsageCache{}
				scannerLogIf(ctx, cache.load(ctx, er, cacheName))
				if cache.Info.Name == "" {
					cache.Info.Name = bucket.Name
				}
				cache.Info.SkipHealing = healing
				cache.Info.NextCycle = wantCycle
				if cache.Info.Name != bucket.Name {

}

// worthKeeping indicates if the cache by itself is worth keeping.
func (m *metacache) worthKeeping() bool {
	if m == nil {
		return false
	}
	cache := m
	switch {
	case !cache.finished() && time.Since(cache.lastUpdate) > metacacheMaxRunningAge:
		// Not finished and update for metacacheMaxRunningAge, discard it.
		return false
	case cache.finished() && time.Since(cache.lastHandout) > 5*metacacheMaxClientWait: