// 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,
	}
}

// InitOnce initializes the cache with a TTL and an update function. It is
// guaranteed to be called only once.
func (t *Cache[T]) InitOnce(ttl time.Duration, opts Opts, update func() (T, error)) {
	t.Once.Do(func() {

	}
}

func saveKeyEtcdWithTTL(ctx context.Context, client *etcd.Client, key string, data []byte, ttl int64) error {
	timeoutCtx, cancel := context.WithTimeout(ctx, defaultContextTimeout)
	defer cancel()
	lease, err := client.Grant(timeoutCtx, ttl)
	if err != nil {
		return etcdErrToErr(err, client.Endpoints())
	}
	_, err = client.Put(timeoutCtx, key, string(data), etcd.WithLease(lease.ID))

public class AzureAdAuthenticator implements SsoAuthenticator {

    private static final Logger logger = LogManager.getLogger(AzureAdAuthenticator.class);

    protected static final String AZUREAD_STATE_TTL = "aad.state.ttl";

    protected static final String AZUREAD_AUTHORITY = "aad.authority";

    protected static final String AZUREAD_TENANT = "aad.tenant";

		}

		err := store.saveMappedPolicy(ctx, cred.ParentUser, stsUser, false, mp, options{ttl: ttl})
		if err != nil {
			return time.Time{}, err
		}

		cache.iamSTSPolicyMap.Store(cred.ParentUser, mp)
	}

	u := newUserIdentity(cred)
	err := store.saveUserIdentity(ctx, accessKey, stsUser, u, options{ttl: ttl})
	if err != nil {
		return time.Time{}, err
	}

		Hidden: true,
		EnvVar: "MINIO_INTERFACE",
	},
	cli.DurationFlag{
		Name:   "dns-cache-ttl",
		Usage:  "custom DNS cache TTL",
		Hidden: true,
		Value: func() time.Duration {
			if orchestrated {
				return 30 * time.Second
			}
			return 10 * time.Minute
		}(),
		EnvVar: "MINIO_DNS_CACHE_TTL",
	},
	cli.IntFlag{
		Name:   "max-idle-conns-per-host",

}

func runDNSCache(ctx *cli.Context) {
	dnsTTL := ctx.Duration("dns-cache-ttl")
	// Check if we have configured a custom DNS cache TTL.
	if dnsTTL <= 0 {
		if orchestrated {
			dnsTTL = 30 * time.Second
		} else {
			dnsTTL = 10 * time.Minute
		}
	}

	// Call to refresh will refresh names in cache.

                                    path:
                                      description: Path to set for the cookie.
                                      type: string
                                    ttl:
                                      description: Lifetime of the cookie.
                                      type: string
                                  required:
                                  - name

                                    path:
                                      description: Path to set for the cookie.
                                      type: string
                                    ttl:
                                      description: Lifetime of the cookie.
                                      type: string
                                  required:
                                  - name

		metric.VariableLabels[k] = v
	}
	for k, v := range m.Histogram {
		metric.Histogram[k] = v
	}
	return metric
}

// Get - returns cached value always upton the configured TTL,
// once the TTL expires "read()" registered function is called
// to return the new values and updated.
func (g *MetricsGroupV2) Get() (metrics []MetricV2) {
	m, _ := g.metricsCache.Get()
	if len(m) == 0 {
		return []MetricV2{}

                type: boolean
              minimumTtl:
                description: 'For multi hop sessions only: configure the minimum expected
                  TTL for an incoming BFD control packet.'
                format: int32
                maximum: 254
                minimum: 1
                type: integer
              passiveMode: