* read-write locks. Conceptually, lock striping is the technique of dividing a lock into many
 * <i>stripes</i>, increasing the granularity of a single lock and allowing independent operations
 * to lock different stripes and proceed concurrently, instead of creating contention for a single
 * lock.
 *
 * <p>The guarantee provided by this class is that equal keys lead to the same lock (or semaphore),

```JSON
{"item_id": 5, "q": "somequery"}
```

Hai appena creato un'API che:

* Riceve richieste HTTP sui _paths_ `/` and `/items/{item_id}`.
* Entrambi i _paths_ accettano`GET` operations (conosciuti anche come <abbr title="metodi HTTP">HTTP _methods_</abbr>).
* Il _path_ `/items/{item_id}` ha un _path parameter_ `item_id` che deve essere un `int`.

// NOTE: once a tenant is frozen either two things needs to
// happen before resuming normal operations.
//   - Server needs to be restarted 'mc admin service restart'
//   - 'freeze' should be set to 'false' for this call
//     to resume normal operations.
func (sys *NotificationSys) ServiceFreeze(ctx context.Context, freeze bool) []NotificationPeerErr {
	serviceSig := serviceUnFreeze

**Please note that when AD/LDAP is configured, MinIO will not support long term users defined internally.** Only AD/LDAP users (and the root user) are allowed. In addition to this, the server will not support operations on users or groups using `mc admin user` or `mc admin group` commands except `mc admin user info` and `mc admin group info` to list set policies for users and groups. This is because users and groups are defined externally in AD/LDAP.

 *       edition, Item 17).
 *   <li>Has the value-based (not identity-based) {@link #equals}, {@link #hashCode}, and {@link
 *       #toString} behavior you expect.
 *   <li>Offers useful operations beyond just {@code get} and {@code length}, so you don't have to
 *       hunt through classes like {@link Arrays} and {@link Ints} for them.

  private static void assertHashStringEquivalence(HashFunction hashFunction, Random random) {
    // Test that only data and data-order is important, not the individual operations.
    new EqualsTester()
        .addEqualityGroup(
            hashFunction.hashUnencodedChars("abc"),
            hashFunction.newHasher().putUnencodedChars("abc").hash(),

import javax.annotation.CheckForNull;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * An implementation of {@code RangeMap} based on a {@code TreeMap}, supporting all optional
 * operations.
 *
 * <p>Like all {@code RangeMap} implementations, this supports neither null keys nor null values.
 *
 * @author Louis Wasserman
 * @since 14.0
 */

  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.Time startTime = 2;

  // Represents time when the job was completed. It is not guaranteed to
  // be set in happens-before order across separate operations.
  // It is represented in RFC3339 form and is in UTC.
  // The completion time is only set when the job finishes successfully.
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.Time completionTime = 3;

	"github.com/minio/pkg/v3/mimedb"
	"github.com/minio/pkg/v3/sync/errgroup"
	"github.com/minio/sio"
)

// list all errors which can be ignored in object operations.
var objectOpIgnoredErrs = append(baseIgnoredErrs, errDiskAccessDenied, errUnformattedDisk, errDiskOngoingReq)

// Object Operations

func countOnlineDisks(onlineDisks []StorageAPI) (online int) {
	for _, onlineDisk := range onlineDisks {
		if onlineDisk != nil && onlineDisk.IsOnline() {

And still, you would probably not want the application to stay dead because there was an error in one place, you probably want it to **continue running** at least for the *path operations* that are not broken.

### Restart After Crash