func NewFromFunc[T any](ttl time.Duration, opts Opts, update func(ctx context.Context) (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(ctx context.Context) (T, error)) {
	t.Once.Do(func() {
		t.ttl = ttl

package cmd

import (
	"bytes"
	"compress/gzip"
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"math/rand"
	"net/url"
	"time"

	"github.com/minio/madmin-go/v3"
)

var callhomeLeaderLockTimeout = newDynamicTimeout(30*time.Second, 10*time.Second)

// initCallhome will start the callhome task in the background.
func initCallhome(ctx context.Context, objAPI ObjectLayer) {
	if !globalCallhomeConfig.Enabled() {

	return val
}

func setCaller(ctx context.Context, cl *RemoteClient) context.Context {
	//nolint:staticcheck // SA1029 Staticcheck is drunk.
	return context.WithValue(ctx, ctxCallerKey{}, cl)
}

func setSubroute(ctx context.Context, s string) context.Context {
	//nolint:staticcheck // SA1029 Staticcheck is drunk.
	return context.WithValue(ctx, ctxSubrouteKey{}, s)
}

	bucketStorageCache.InitOnce(10*time.Second,
		cachevalue.Opts{ReturnLastGood: true, NoWait: true},
		func(ctx context.Context) (DataUsageInfo, error) {
			if objAPI == nil {
				return DataUsageInfo{}, errServerNotInitialized
			}
			ctx, done := context.WithTimeout(ctx, 2*time.Second)
			defer done()

			return loadDataUsageFromBackend(ctx, objAPI)
		},
	)
}

	return nil
}

// DoWithContext is similar to Do except that it accepts a context as an argument to be passed.
func (l *Init) DoWithContext(ctx context.Context, f func(context.Context) error) error {
	if atomic.LoadUint32(&l.done) == 0 {
		return l.doWithContext(ctx, f)
	}
	return nil
}

func (l *Init) doWithContext(ctx context.Context, f func(context.Context) error) error {
	l.m.Lock()
	defer l.m.Unlock()

```java
import jcifs.CIFSContext;
import jcifs.context.BaseContext;
import jcifs.smb.NtlmPasswordAuthenticator;

// Create context with credentials
CIFSContext context = new BaseContext(new jcifs.config.PropertyConfiguration());
NtlmPasswordAuthenticator auth = new NtlmPasswordAuthenticator("domain", "username", "password");
CIFSContext authContext = context.withCredentials(auth);

// Use authenticated context

            protected FilterChain createDefaultFilterChain() {
                return (context, query, boost) -> {
                    called.set(true);
                    return QueryBuilders.boolQuery();
                };
            }
        };
        queryProcessor.init();

        QueryContext context = new QueryContext(null, false);
        MatchAllDocsQuery query = new MatchAllDocsQuery();

	loadMappedPolicies(ctx context.Context, userType IAMUserType, isGroup bool, m *xsync.MapOf[string, MappedPolicy]) error
	saveIAMConfig(ctx context.Context, item any, path string, opts ...options) error
	loadIAMConfig(ctx context.Context, item any, path string) error
	deleteIAMConfig(ctx context.Context, path string) error
	savePolicyDoc(ctx context.Context, policyName string, p PolicyDoc) error

        url = "http://www.foo.com/";
        result = "http://www.foo.com/";
        assertEquals(result, duplicateHostHelper.convert(url));

        url = "http://www.foo.com:8080/";
        result = "http://www.foo.com:8080/";
        assertEquals(result, duplicateHostHelper.convert(url));

        url = "http://www.bar.com/";
        result = "http://www.bar.com/";

}

func (ies *IAMEtcdStore) deleteIAMConfig(ctx context.Context, path string) error {
	return deleteKeyEtcd(ctx, ies.client, path)
}

func (ies *IAMEtcdStore) loadPolicyDocWithRetry(ctx context.Context, policy string, m map[string]PolicyDoc, _ int) error {
	return ies.loadPolicyDoc(ctx, policy, m)
}

func (ies *IAMEtcdStore) loadPolicyDoc(ctx context.Context, policy string, m map[string]PolicyDoc) error {