private final int timeoutMs;
    private CountdownTimer timer;

    public static ExponentialBackoff<Signal> of(int amount, TimeUnit unit) {
        return of(amount, unit, Signal.SLEEP);
    }

    public static <T extends Signal> ExponentialBackoff<T> of(int amount, TimeUnit unit, T signal) {
        return new ExponentialBackoff<T>((int) TimeUnit.MILLISECONDS.convert(amount, unit), signal, SLOT_TIME);
    }

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

// Package exponentialbackoff contains logic for implementing exponential
// backoff for GoRoutineMap and NestedPendingOperations.
package exponentialbackoff

import (
	"fmt"
	"time"
)

const (
	// initialDurationBeforeRetry is the amount of time after an error occurs

}

type Option struct {
	InitialInterval time.Duration
	MaxInterval     time.Duration
}

// ExponentialBackOff is a wrapper of backoff.ExponentialBackOff to override its NextBackOff().
type ExponentialBackOff struct {
	exponentialBackOff *backoff.ExponentialBackOff
}

// Default values for ExponentialBackOff.
const (
	defaultInitialInterval = 500 * time.Millisecond
	defaultMaxInterval     = 60 * time.Second
)

                    return ExponentialBackoff.Result.successful(lockOutcome);
                } else {
                    return ExponentialBackoff.Result.notSuccessful(lockOutcome);
                }
            });
        }
    }

    private ExponentialBackoff<AwaitableFileLockReleasedSignal> newExponentialBackoff(int shortTimeoutMs) {

        try {
            ExponentialBackoff<ExponentialBackoff.Signal> backoff = ExponentialBackoff.of(5, TimeUnit.SECONDS, 50, TimeUnit.MILLISECONDS);
            backoff.retryUntil(() -> {
                URI baseUri = serversLeft.poll();
                if (baseUri == null) {
                    // no more servers left despite retries
                    return ExponentialBackoff.Result.successful(false);
                }

import com.google.api.client.http.HttpResponse;
import com.google.api.client.http.HttpTransport;
import com.google.api.client.http.HttpUnsuccessfulResponseHandler;
import com.google.api.client.util.ExponentialBackOff;
import com.google.api.client.util.Sleeper;
import com.google.common.base.Preconditions;
import com.google.common.base.Supplier;
import org.gradle.api.logging.Logger;
import org.gradle.api.logging.Logging;

			err := rc.operationExecutor.UnregisterPlugin(registeredPlugin, rc.actualStateOfWorld)
			if err != nil &&
				!goroutinemap.IsAlreadyExists(err) &&
				!exponentialbackoff.IsExponentialBackoff(err) {
				// Ignore goroutinemap.IsAlreadyExists and exponentialbackoff.IsExponentialBackoff errors, they are expected.
				// Log all other errors.
				klog.ErrorS(err, "OperationExecutor.UnregisterPlugin failed", "plugin", registeredPlugin)
			}

	lock                      sync.RWMutex
}

type operation struct {
	key              operationKey
	operationName    string
	operationPending bool
	expBackoff       exponentialbackoff.ExponentialBackoff
}

func (grm *nestedPendingOperations) Run(
	volumeName v1.UniqueVolumeName,
	podName volumetypes.UniquePodName,
	nodeName types.NodeName,

	cond                      *sync.Cond
	lock                      sync.RWMutex
}

// operation holds the state of a single goroutine.
type operation struct {
	operationPending bool
	expBackoff       exponentialbackoff.ExponentialBackoff
}

func (grm *goRoutineMap) Run(
	operationName string,
	operationFunc func() error) error {
	grm.lock.Lock()
	defer grm.lock.Unlock()

	existingOp, exists := grm.operations[operationName]

		testMaxInterval     = 5 * time.Second
	)

	o := DefaultOption()
	o.InitialInterval = testInitialInterval
	o.MaxInterval = testMaxInterval
	exp := NewExponentialBackOff(o)
	exp.(ExponentialBackOff).exponentialBackOff.Multiplier = 2

	expectedResults := []time.Duration{500, 1000, 2000, 4000, 5000, 5000, 5000, 5000, 5000, 5000}
	for i, d := range expectedResults {
		expectedResults[i] = d * time.Millisecond
	}