*/
@GwtCompatible
@ElementTypesAreNonnullByDefault
abstract class AbstractIterator<T extends @Nullable Object> implements Iterator<T> {
  private State state = State.NOT_READY;

  protected AbstractIterator() {}

  private enum State {
    READY,
    NOT_READY,
    DONE,
    FAILED,
  }

  @CheckForNull private T next;

  @CheckForNull
  protected abstract T computeNext();

  @CanIgnoreReturnValue

 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
abstract class AbstractIterator<T extends @Nullable Object> implements Iterator<T> {
  private State state = State.NOT_READY;

  protected AbstractIterator() {}

  private enum State {
    READY,
    NOT_READY,
    DONE,
    FAILED,
  }

  @CheckForNull private T next;

  @CheckForNull
  protected abstract T computeNext();

  @CanIgnoreReturnValue

  private State state = State.NOT_READY;

  /** Constructor for use by subclasses. */
  protected AbstractIterator() {}

  private enum State {
    /** We have computed the next element and haven't returned it yet. */
    READY,

    /** We haven't yet computed or have already returned the element. */
    NOT_READY,

    /** We have reached the end of the data and are finished. */

  private State state = State.NOT_READY;

  /** Constructor for use by subclasses. */
  protected AbstractIterator() {}

  private enum State {
    /** We have computed the next element and haven't returned it yet. */
    READY,

    /** We haven't yet computed or have already returned the element. */
    NOT_READY,

    /** We have reached the end of the data and are finished. */

		name           string
		node           api.Node
		oldNode        api.Node
		operation      admission.Operation
		options        runtime.Object
		expectedTaints []api.Taint
	}{
		{
			name:           "notReady taint is added on creation",
			node:           myNodeObj,
			operation:      admission.Create,
			options:        &metav1.CreateOptions{},
			expectedTaints: []api.Taint{notReadyTaint},
		},
		{

}

// getNotReadyNodes returns a string slice of nodes in the cluster that are NotReady
func getNotReadyNodes(nodes []v1.Node) []string {
	var notReadyNodes []string
	for _, node := range nodes {
		for _, condition := range node.Status.Conditions {
			if condition.Type == v1.NodeReady && condition.Status != v1.ConditionTrue {
				notReadyNodes = append(notReadyNodes, node.ObjectMeta.Name)
			}
		}

	}

	node, ok := a.GetObject().(*api.Node)
	if !ok {
		return admission.NewForbidden(a, fmt.Errorf("unexpected type %T", a.GetObject()))
	}

	// Taint node with NotReady taint at creation. This is needed to make sure
	// that nodes are added to the cluster with the NotReady taint. Otherwise,
	// a new node may receive the taint with some delay causing pods to be
	// scheduled on a not-ready node. Node controller will remove the taint

	// and removed when node becomes ready.
	TaintNodeNotReady = "node.kubernetes.io/not-ready"

	// TaintNodeUnreachable will be added when node becomes unreachable
	// (corresponding to NodeReady status ConditionUnknown)
	// and removed when node becomes reachable (NodeReady status ConditionTrue).
	TaintNodeUnreachable = "node.kubernetes.io/unreachable"

	// TaintNodeUnschedulable will be added when node becomes unschedulable

	FailedToInspectImage    = "InspectFailed"
	ErrImageNeverPullPolicy = "ErrImageNeverPull"
	BackOffPullImage        = "BackOff"
)

// kubelet event reason list
const (
	NodeReady                            = "NodeReady"
	NodeNotReady                         = "NodeNotReady"
	NodeSchedulable                      = "NodeSchedulable"
	NodeNotSchedulable                   = "NodeNotSchedulable"

		bootstrapGracePeriod: defaultBootstrapGraceperiod,
	}
	return &p
}

func (a *poller) lastError(err error) {
	a.lock.Lock()
	defer a.lock.Unlock()
	a.lastErr = err
}

func (a *poller) notReady() {
	a.lock.Lock()
	defer a.lock.Unlock()
	a.ready = false
}

func (a *poller) bootstrapping() {
	// bootstrapGracePeriod is read-only, so no lock is required
	timer := time.NewTimer(a.bootstrapGracePeriod)