}

func NodeID(value string) Instance {
	return newOption("nodeID", value)
}

func NodeType(value string) Instance {
	ntype := strings.Split(value, "~")[0]
	return newOption("nodeType", ntype)
}

func XdsType(value string) Instance {
	return newOption("xds_type", value)
}

func Region(value string) Instance {
	return newOptionOrSkipIfZero("region", value)
}

func Zone(value string) Instance {

	// Cacheable indicates whether this entry is valid for cache. For example
	// for EDS to be cacheable, the Endpoint should have corresponding service.
	Cacheable() bool
}

const (
	CDSType = "cds"
	EDSType = "eds"
	RDSType = "rds"
	SDSType = "sds"
)

// NewXdsCache returns an instance of a cache.
func NewXdsCache() XdsCache {
	cache := XdsCacheImpl{
		eds: newTypedXdsCache[uint64](),
	}
	if features.EnableCDSCaching {

		}
	})

	t.Run("clear all", func(t *testing.T) {
		c := model.NewXdsCache()
		start := time.Now()
		c.Add(ep1, &model.PushRequest{Start: start}, any1)
		c.Add(ep2, &model.PushRequest{Start: start}, any2)

		c.ClearAll()
		if len(c.Keys(model.EDSType)) != 0 {
			t.Fatalf("expected no keys, got: %v", c.Keys(model.EDSType))
		}
		if got := c.Get(ep1); got != nil {

	DelegateVirtualServices []model.ConfigHash
	DestinationRules        []*model.ConsolidatedDestRule
	EnvoyFilterKeys         []string
}

func (r *Cache) Type() string {
	return model.RDSType
}

func (r *Cache) Cacheable() bool {
	if r == nil {
		return false
	}
	if r.ListenerPort == 0 {
		return false
	}

	for _, config := range r.VirtualServices {

	serviceAccounts []string // contains all the service accounts associated with the service
}

func (t *clusterCache) Type() string {
	return model.CDSType
}

func (t *clusterCache) Key() any {
	// nolint: gosec
	// Not security sensitive code
	h := hash.New()
	h.WriteString(t.clusterName)
	h.Write(Separator)
	h.WriteString(t.proxyVersion)
	h.Write(Separator)

type SecretResource struct {
	credentials.SecretResource
	pkpConfHash string
}

var _ model.XdsCacheEntry = SecretResource{}

func (sr SecretResource) Type() string {
	return model.SDSType
}

func (sr SecretResource) Key() any {
	return sr.SecretResource.Key() + "/" + sr.pkpConfHash
}

func (sr SecretResource) DependentConfigs() []model.ConfigHash {
	configs := []model.ConfigHash{}

	if dr := b.destinationRule.GetRule(); dr != nil {
		dr, _ := dr.Spec.(*v1alpha3.DestinationRule)
		return dr
	}
	return nil
}

func (b *EndpointBuilder) Type() string {
	return model.EDSType
}

func (b *EndpointBuilder) ServiceFound() bool {
	return b.service != nil
}

func (b *EndpointBuilder) IsDNSCluster() bool {