ProcessPreemption(
		pod *v1.Pod,
		nodeNameToVictims map[string]*extenderv1.Victims,
		nodeInfos NodeInfoLister,
	) (map[string]*extenderv1.Victims, error)

	// SupportsPreemption returns if the scheduler extender support preemption or not.
	SupportsPreemption() bool

	// IsIgnorable returns true indicates scheduling should not fail when this extender

// is unavailable
func (h *HTTPExtender) IsIgnorable() bool {
	return h.ignorable
}

// SupportsPreemption returns true if an extender supports preemption.
// An extender should have preempt verb defined and enabled its own node cache.
func (h *HTTPExtender) SupportsPreemption() bool {
	return len(h.preemptVerb) > 0
}

// IsIgnorable returns a bool value indicating whether internal errors can be ignored.
func (f *FakeExtender) IsIgnorable() bool {
	return f.Ignorable
}

// SupportsPreemption returns true indicating the extender supports preemption.
func (f *FakeExtender) SupportsPreemption() bool {
	// Assume preempt verb is always defined.
	return true
}

// ProcessPreemption implements the extender preempt function.

	victimsMap := ev.CandidatesToVictimsMap(candidates)
	if len(victimsMap) == 0 {
		return candidates, nil
	}
	for _, extender := range extenders {
		if !extender.SupportsPreemption() || !extender.IsInterested(pod) {
			continue
		}
		nodeNameToVictims, err := extender.ProcessPreemption(pod, victimsMap, nodeLister)
		if err != nil {
			if extender.IsIgnorable() {

func (f *fakeExtender) ProcessPreemption(
	_ *v1.Pod,
	_ map[string]*extenderv1.Victims,
	_ framework.NodeInfoLister,
) (map[string]*extenderv1.Victims, error) {
	return nil, nil
}

func (f *fakeExtender) SupportsPreemption() bool {
	return false
}

func (f *fakeExtender) Filter(pod *v1.Pod, nodes []*framework.NodeInfo) ([]*framework.NodeInfo, extenderv1.FailedNodesMap, extenderv1.FailedNodesMap, error) {
	return nil, nil, nil, nil