logger.V(4).Info("Add DB", "podDisruptionBudget", klog.KObj(pdb))
	dc.enqueuePdb(logger, pdb)
}

func (dc *DisruptionController) updateDB(logger klog.Logger, old, cur interface{}) {
	// TODO(mml) ignore updates where 'old' is equivalent to 'cur'.
	pdb := cur.(*policy.PodDisruptionBudget)
	logger.V(4).Info("Update DB", "podDisruptionBudget", klog.KObj(pdb))
	dc.enqueuePdb(logger, pdb)
}

 *
 *  * **Connecting:** the initial state of each web socket. Messages may be enqueued but they won't
 *    be transmitted until the web socket is open.
 *
 *  * **Open:** the web socket has been accepted by the remote peer and is fully operational.
 *    Messages in either direction are enqueued for immediate transmission.
 *

  private val messageAndCloseQueue = ArrayDeque<Any>()

  /** The total size in bytes of enqueued but not yet transmitted messages. */
  private var queueSize = 0L

  /** True if we've enqueued a close frame. No further message frames will be enqueued. */
  private var enqueuedClose = false

  /** The close code from the peer, or -1 if this web socket has not yet read a close frame. */

	var queue []module.Version
	enqueued := make(map[module.Version]bool)
	for _, m := range g.roots {
		if m.Version != "none" {
			queue = append(queue, m)
			enqueued[m] = true
		}
	}

	for len(queue) > 0 {
		m := queue[0]
		queue = queue[1:]

		f(m)

		reqs, _ := g.RequiredBy(m)
		for _, r := range reqs {
			if !enqueued[r] && r.Version != "none" {
				queue = append(queue, r)

					pendingAttemptToDelete: []*node{
						makeNode(badSecretReferenceWithDeploymentUID, virtual), // virtual parent enqueued for delete attempt
						makeNode(goodChildPod, withOwners(deployment1apps)),    // good child enqueued for delete attempt
					},
				}),

				// 7,8: process pending delete of virtual parent
				processAttemptToDelete(1),
				assertState(state{

	c, _, err := f.newController(ctx)
	if err != nil {
		t.Fatalf("error creating Deployment controller: %v", err)
	}
	enqueued := false
	c.enqueueDeployment = func(d *apps.Deployment) {
		if d.Name == "foo" {
			enqueued = true
		}
	}

	c.deletePod(logger, pod)

	if !enqueued {
		t.Errorf("expected deployment %q to be queued after pod deletion", foo.Name)
	}
}

  interface Event<L> {
    /** Call a method on the listener. */
    void call(L listener);
  }

  /**
   * Adds a listener that will be called using the given executor when events are later {@link
   * #enqueue enqueued} and {@link #dispatch dispatched}.
   */
  public void addListener(L listener, Executor executor) {
    checkNotNull(listener, "listener");
    checkNotNull(executor, "executor");

		ObjectMeta: metav1.ObjectMeta{
			Name:            "pod",
			Namespace:       "ns",
			OwnerReferences: []metav1.OwnerReference{},
		},
	})
	if got := written.Load(); got != "" {
		t.Fatalf("unexpectedly enqueued %v", got)
	}

	handler(&corev1.Pod{
		ObjectMeta: metav1.ObjectMeta{
			Name:      "pod",
			Namespace: "ns",
			OwnerReferences: []metav1.OwnerReference{{
				APIVersion: gvk.Deployment.GroupVersion(),

  /** Cancels the request, if possible. Requests that are already complete cannot be canceled. */
  fun cancel()

  /**
   * Returns true if this call has been either [executed][execute] or [enqueued][enqueue]. It is an
   * error to execute a call more than once.
   */
  fun isExecuted(): Boolean

  fun isCanceled(): Boolean

  /**

package xds

import (
	"sync"

	"istio.io/istio/pilot/pkg/model"
)

type PushQueue struct {
	cond *sync.Cond

	// pending stores all connections in the queue. If the same connection is enqueued again,
	// the PushRequest will be merged.
	pending map[*Connection]*model.PushRequest

	// queue maintains ordering of the queue
	queue []*Connection