switch getRequestAuthType(r) {
	case authTypeUnknown, authTypeStreamingSigned:
		return ErrSignatureVersionNotSupported
	case authTypePresignedV2, authTypeSignedV2:
		if s3Err = isReqAuthenticatedV2(r); s3Err != ErrNone {
			return s3Err
		}
		cred, owner, s3Err = getReqAccessKeyV2(r)
	case authTypeSigned, authTypePresigned:
		region := globalSite.Region
		switch action {

		secretKey          string
		expectedRespStatus int
	}{
		// Test case - 1.
		// Validate a good case request succeeds.
		{
			bucketName:         bucketName,
			accessKey:          credentials.AccessKey,
			secretKey:          credentials.SecretKey,
			expectedRespStatus: http.StatusOK,
		},
		// Test case - 2.
		// Test case with invalid accessKey to produce and validate Signature Mismatch error.
		{

			// unconsumedTimer fires.
			select {
			// Check after a second
			case <-time.After(time.Second):
				h.mutex.Unlock()
				continue

			case <-h.ctx.Done():
				h.mutex.Unlock()
				// discard result and return.
				return errHealStopSignalled

			// Timeout if no results consumed for too long.
			case <-unconsumedTimer.C:
				h.mutex.Unlock()
				return errHealIdleTimeout
			}
		}

		path           string
		bucket, object string
	}{
		// Test case 1 normal case.
		{
			path:   "/bucket/object",
			bucket: "bucket",
			object: "object",
		},
		// Test case 2 where url only has separator.
		{
			path:   SlashSeparator,
			bucket: "",
			object: "",
		},
		// Test case 3 only bucket is present.
		{
			path:   "/bucket",
			bucket: "bucket",

			go func(ctx context.Context) {
				errChan <- in.sleepWatchInstall(ctx, sets.String{})
			}(ctx)

			select {
			case <-readyChan:
				assert.Equal(t, isReady.Load(), true)
			case err := <-errChan:
				if err == nil {
					t.Fatal("invalid configuration detected")
				}
				t.Fatal(err)
			case <-time.After(5 * time.Second):
				t.Fatal("timed out waiting for isReady to be set to true")
			}

		}
		if creds.AzSP.ClientSecret != "" {
			cfg.Azure.SPAuth.ClientSecret = creds.AzSP.ClientSecret
		}
	case madmin.GCS:
		if creds.CredsJSON == nil {
			return errTierMissingCredentials
		}
		cfg.GCS.Creds = base64.URLEncoding.EncodeToString(creds.CredsJSON)
	case madmin.MinIO:
		if creds.AccessKey == "" || creds.SecretKey == "" {
			return errTierMissingCredentials
		}
		cfg.MinIO.AccessKey = creds.AccessKey

				}
				select {
				case newVersion := <-w.resultsChan:
					printVerbosef(cmd, "received new target version: %s", newVersion)
					generations = append(generations, newVersion)
				case <-t.C:
					printVerbosef(cmd, "tick")
					continue
				case err = <-w.errorChan:
					t.Stop()
					return fmt.Errorf("unable to retrieve Kubernetes resource2 %s: %v", "", err)
				case <-ctx.Done():

	ret := make(chan updateResponse, 1)
	req := updateRequest{
		Update: data,
		Fd:     fd,
		Resp:   ret,
	}
	select {
	case z.Updates <- req:
	case <-ctx.Done():
		return nil, ctx.Err()
	}

	select {
	case r := <-ret:
		return r.resp, r.err
	case <-ctx.Done():
		return nil, ctx.Err()
	}
}

 * the License.
 */

package com.google.common.io;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkPositionIndexes;
import static com.google.common.base.Preconditions.checkState;
import static com.google.common.math.IntMath.divide;
import static com.google.common.math.IntMath.log2;

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.collect.NullnessCasts.uncheckedCastNullableTToT;

import com.google.common.annotations.GwtCompatible;