func AddHPAScaleRefEdges(g osgraph.Graph) {
	for _, node := range g.NodesByKind(kubegraph.HorizontalPodAutoscalerNodeKind) {
		hpaNode := node.(*kubegraph.HorizontalPodAutoscalerNode)

		syntheticMeta := kapi.ObjectMeta{
			Name:      hpaNode.HorizontalPodAutoscaler.Spec.ScaleRef.Name,
			Namespace: hpaNode.HorizontalPodAutoscaler.Namespace,
		}

		var groupVersionResource unversioned.GroupVersionResource
		resource := strings.ToLower(hpaNode.HorizontalPodAutoscaler.Spec.ScaleRef.Kind)
		if groupVersion, err := unversioned.ParseGroupVersion(hpaNode.HorizontalPodAutoscaler.Spec.ScaleRef.APIVersion); err == nil {
			groupVersionResource = groupVersion.WithResource(resource)
		} else {
			groupVersionResource = unversioned.GroupVersionResource{Resource: resource}
		}

		groupVersionResource, err := registered.RESTMapper().ResourceFor(groupVersionResource)
		if err != nil {
			continue
		}

		var syntheticNode graph.Node
		switch groupVersionResource.GroupResource() {
		case kapi.Resource("replicationcontrollers"):
			syntheticNode = kubegraph.FindOrCreateSyntheticReplicationControllerNode(g, &kapi.ReplicationController{ObjectMeta: syntheticMeta})
		case deployapi.Resource("deploymentconfigs"):
			syntheticNode = deploygraph.FindOrCreateSyntheticDeploymentConfigNode(g, &deployapi.DeploymentConfig{ObjectMeta: syntheticMeta})
		default:
			continue
		}

		g.AddEdge(hpaNode, syntheticNode, ScalingEdgeKind)
	}
}

// ResourceSingularizer implements RESTMapper
// It converts a resource name from plural to singular (e.g., from pods to pod)
func (m *DefaultRESTMapper) ResourceSingularizer(resourceType string) (string, error) {
	partialResource := unversioned.GroupVersionResource{Resource: resourceType}
	resources, err := m.ResourcesFor(partialResource)
	if err != nil {
		return resourceType, err
	}

	singular := unversioned.GroupVersionResource{}
	for _, curr := range resources {
		currSingular, ok := m.pluralToSingular[curr]
		if !ok {
			continue
		}
		if singular.IsEmpty() {
			singular = currSingular
			continue
		}

		if currSingular.Resource != singular.Resource {
			return resourceType, fmt.Errorf("multiple possibilities found %v has been defined", resources)
		}
	}

	if singular.IsEmpty() {
		return resourceType, fmt.Errorf("no singular of resource %v has been defined", resources[0])
	}

	return singular.Resource, nil
}

func monitorFor(p *Propagator, clientPool dynamic.ClientPool, resource unversioned.GroupVersionResource) (monitor, error) {
	// TODO: consider store in one storage.
	glog.V(6).Infof("create storage for resource %s", resource)
	var monitor monitor
	client, err := clientPool.ClientForGroupVersion(resource.GroupVersion())
	if err != nil {
		return monitor, err
	}
	monitor.store, monitor.controller = framework.NewInformer(
		// TODO: make special List and Watch function that removes fields other
		// than ObjectMeta.
		&cache.ListWatch{
			ListFunc: func(options api.ListOptions) (runtime.Object, error) {
				// APIResource.Kind is not used by the dynamic client, so
				// leave it empty. We want to list this resource in all
				// namespaces if it's namespace scoped, so leave
				// APIResource.Namespaced as false is all right.
				apiResource := unversioned.APIResource{Name: resource.Resource}
				return client.Resource(&apiResource, api.NamespaceAll).List(&options)
			},
			WatchFunc: func(options api.ListOptions) (watch.Interface, error) {
				// APIResource.Kind is not used by the dynamic client, so
				// leave it empty. We want to list this resource in all
				// namespaces if it's namespace scoped, so leave
				// APIResource.Namespaced as false is all right.
				apiResource := unversioned.APIResource{Name: resource.Resource}
				return client.Resource(&apiResource, api.NamespaceAll).Watch(&options)
			},
		},
		nil,
		ResourceResyncTime,
		framework.ResourceEventHandlerFuncs{
			// add the event to the propagator's eventQueue.
			AddFunc: func(obj interface{}) {
				event := event{
					eventType: addEvent,
					obj:       obj,
				}
				p.eventQueue.Add(event)
			},
			UpdateFunc: func(oldObj, newObj interface{}) {
				event := event{updateEvent, newObj, oldObj}
				p.eventQueue.Add(event)
			},
			DeleteFunc: func(obj interface{}) {
				// delta fifo may wrap the object in a cache.DeletedFinalStateUnknown, unwrap it
				if deletedFinalStateUnknown, ok := obj.(cache.DeletedFinalStateUnknown); ok {
					obj = deletedFinalStateUnknown.Obj
				}
				event := event{
					eventType: deleteEvent,
					obj:       obj,
				}
				p.eventQueue.Add(event)
			},
		},
	)
	return monitor, nil
}

// coerceResourceForMatching makes the resource lower case and converts internal versions to unspecified (legacy behavior)
func coerceResourceForMatching(resource unversioned.GroupVersionResource) unversioned.GroupVersionResource {
	resource.Resource = strings.ToLower(resource.Resource)
	if resource.Version == runtime.APIVersionInternal {
		resource.Version = ""
	}

	return resource
}

// deleteAllContentForGroupVersionResource will use the dynamic client to delete each resource identified in gvr.
// It returns an estimate of the time remaining before the remaing resources are deleted.
// If estimate > 0, not all resources are guaranteed to be gone.
func deleteAllContentForGroupVersionResource(
	kubeClient clientset.Interface,
	clientPool dynamic.ClientPool,
	opCache operationNotSupportedCache,
	gvr unversioned.GroupVersionResource,
	namespace string,
	namespaceDeletedAt unversioned.Time,
) (int64, error) {
	glog.V(5).Infof("namespace controller - deleteAllContentForGroupVersionResource - namespace: %s, gvr: %v", namespace, gvr)

	// estimate how long it will take for the resource to be deleted (needed for objects that support graceful delete)
	estimate, err := estimateGracefulTermination(kubeClient, gvr, namespace, namespaceDeletedAt)
	if err != nil {
		glog.V(5).Infof("namespace controller - deleteAllContentForGroupVersionResource - unable to estimate - namespace: %s, gvr: %v, err: %v", namespace, gvr, err)
		return estimate, err
	}
	glog.V(5).Infof("namespace controller - deleteAllContentForGroupVersionResource - estimate - namespace: %s, gvr: %v, estimate: %v", namespace, gvr, estimate)

	// get a client for this group version...
	dynamicClient, err := clientPool.ClientForGroupVersion(gvr.GroupVersion())
	if err != nil {
		glog.V(5).Infof("namespace controller - deleteAllContentForGroupVersionResource - unable to get client - namespace: %s, gvr: %v, err: %v", namespace, gvr, err)
		return estimate, err
	}

	// first try to delete the entire collection
	deleteCollectionSupported, err := deleteCollection(dynamicClient, opCache, gvr, namespace)
	if err != nil {
		return estimate, err
	}

	// delete collection was not supported, so we list and delete each item...
	if !deleteCollectionSupported {
		err = deleteEachItem(dynamicClient, opCache, gvr, namespace)
		if err != nil {
			return estimate, err
		}
	}

	// verify there are no more remaining items
	// it is not an error condition for there to be remaining items if local estimate is non-zero
	glog.V(5).Infof("namespace controller - deleteAllContentForGroupVersionResource - checking for no more items in namespace: %s, gvr: %v", namespace, gvr)
	unstructuredList, listSupported, err := listCollection(dynamicClient, opCache, gvr, namespace)
	if err != nil {
		glog.V(5).Infof("namespace controller - deleteAllContentForGroupVersionResource - error verifying no items in namespace: %s, gvr: %v, err: %v", namespace, gvr, err)
		return estimate, err
	}
	if !listSupported {
		return estimate, nil
	}
	glog.V(5).Infof("namespace controller - deleteAllContentForGroupVersionResource - items remaining - namespace: %s, gvr: %v, items: %v", namespace, gvr, len(unstructuredList.Items))
	if len(unstructuredList.Items) != 0 && estimate == int64(0) {
		return estimate, fmt.Errorf("unexpected items still remain in namespace: %s for gvr: %v", namespace, gvr)
	}
	return estimate, nil
}

func (m *DefaultRESTMapper) ResourcesFor(resource unversioned.GroupVersionResource) ([]unversioned.GroupVersionResource, error) {
	hasResource := len(resource.Resource) > 0
	hasGroup := len(resource.Group) > 0
	hasVersion := len(resource.Version) > 0

	if !hasResource {
		return nil, fmt.Errorf("a resource must be present, got: %v", resource)
	}

	ret := []unversioned.GroupVersionResource{}
	switch {
	// fully qualified.  Find the exact match
	case hasGroup && hasVersion:
		for plural, singular := range m.pluralToSingular {
			if singular == resource {
				ret = append(ret, plural)
				break
			}
			if plural == resource {
				ret = append(ret, plural)
				break
			}
		}

	case hasGroup:
		requestedGroupResource := resource.GroupResource()
		for currResource := range m.pluralToSingular {
			if currResource.GroupResource() == requestedGroupResource {
				ret = append(ret, currResource)
			}
		}

	case hasVersion:
		for currResource := range m.pluralToSingular {
			if currResource.Version == resource.Version && currResource.Resource == resource.Resource {
				ret = append(ret, currResource)
			}
		}

	default:
		for currResource := range m.pluralToSingular {
			if currResource.Resource == resource.Resource {
				ret = append(ret, currResource)
			}
		}
	}

	if len(ret) == 0 {
		return nil, fmt.Errorf("no resource %v has been defined; known resources: %v", resource, m.pluralToSingular)
	}

	sort.Sort(resourceByPreferredGroupVersion{ret, m.defaultGroupVersions})
	return ret, nil
}

func (m *DefaultRESTMapper) KindsFor(input unversioned.GroupVersionResource) ([]unversioned.GroupVersionKind, error) {
	resource := input.GroupVersion().WithResource(strings.ToLower(input.Resource))
	if resource.Version == runtime.APIVersionInternal {
		resource.Version = ""
	}

	hasResource := len(resource.Resource) > 0
	hasGroup := len(resource.Group) > 0
	hasVersion := len(resource.Version) > 0

	if !hasResource {
		return nil, fmt.Errorf("a resource must be present, got: %v", resource)
	}

	ret := []unversioned.GroupVersionKind{}
	switch {
	// fully qualified.  Find the exact match
	case hasGroup && hasVersion:
		kind, exists := m.resourceToKind[resource]
		if exists {
			ret = append(ret, kind)
		}

	case hasGroup:
		requestedGroupResource := resource.GroupResource()
		for currResource, currKind := range m.resourceToKind {
			if currResource.GroupResource() == requestedGroupResource {
				ret = append(ret, currKind)
			}
		}

	case hasVersion:
		for currResource, currKind := range m.resourceToKind {
			if currResource.Version == resource.Version && currResource.Resource == resource.Resource {
				ret = append(ret, currKind)
			}
		}

	default:
		for currResource, currKind := range m.resourceToKind {
			if currResource.Resource == resource.Resource {
				ret = append(ret, currKind)
			}
		}
	}

	if len(ret) == 0 {
		return nil, &NoResourceMatchError{PartialResource: input}
	}

	sort.Sort(kindByPreferredGroupVersion{ret, m.defaultGroupVersions})
	return ret, nil
}

func (gc *GarbageCollector) monitorFor(resource unversioned.GroupVersionResource, kind unversioned.GroupVersionKind) (monitor, error) {
	// TODO: consider store in one storage.
	glog.V(6).Infof("create storage for resource %s", resource)
	var monitor monitor
	client, err := gc.metaOnlyClientPool.ClientForGroupVersion(resource.GroupVersion())
	if err != nil {
		return monitor, err
	}
	gc.registeredRateLimiterForMonitors.registerIfNotPresent(resource.GroupVersion(), client, "garbage_collector_monitoring")
	setObjectTypeMeta := func(obj interface{}) {
		runtimeObject, ok := obj.(runtime.Object)
		if !ok {
			utilruntime.HandleError(fmt.Errorf("expected runtime.Object, got %#v", obj))
		}
		runtimeObject.GetObjectKind().SetGroupVersionKind(kind)
	}
	monitor.store, monitor.controller = framework.NewInformer(
		gcListWatcher(client, resource),
		nil,
		ResourceResyncTime,
		framework.ResourceEventHandlerFuncs{
			// add the event to the propagator's eventQueue.
			AddFunc: func(obj interface{}) {
				setObjectTypeMeta(obj)
				event := &event{
					eventType: addEvent,
					obj:       obj,
				}
				gc.propagator.eventQueue.Add(&workqueue.TimedWorkQueueItem{StartTime: gc.clock.Now(), Object: event})
			},
			UpdateFunc: func(oldObj, newObj interface{}) {
				setObjectTypeMeta(newObj)
				setObjectTypeMeta(oldObj)
				event := &event{updateEvent, newObj, oldObj}
				gc.propagator.eventQueue.Add(&workqueue.TimedWorkQueueItem{StartTime: gc.clock.Now(), Object: event})
			},
			DeleteFunc: func(obj interface{}) {
				// delta fifo may wrap the object in a cache.DeletedFinalStateUnknown, unwrap it
				if deletedFinalStateUnknown, ok := obj.(cache.DeletedFinalStateUnknown); ok {
					obj = deletedFinalStateUnknown.Obj
				}
				setObjectTypeMeta(obj)
				event := &event{
					eventType: deleteEvent,
					obj:       obj,
				}
				gc.propagator.eventQueue.Add(&workqueue.TimedWorkQueueItem{StartTime: gc.clock.Now(), Object: event})
			},
		},
	)
	return monitor, nil
}

func monitorFor(p *Propagator, clientPool dynamic.ClientPool, resource unversioned.GroupVersionResource, kind unversioned.GroupVersionKind) (monitor, error) {
	// TODO: consider store in one storage.
	glog.V(6).Infof("create storage for resource %s", resource)
	var monitor monitor
	client, err := p.gc.metaOnlyClientPool.ClientForGroupVersion(resource.GroupVersion())
	if err != nil {
		return monitor, err
	}
	setObjectTypeMeta := func(obj interface{}) {
		runtimeObject, ok := obj.(runtime.Object)
		if !ok {
			utilruntime.HandleError(fmt.Errorf("expected runtime.Object, got %#v", obj))
		}
		runtimeObject.GetObjectKind().SetGroupVersionKind(kind)
	}
	monitor.store, monitor.controller = framework.NewInformer(
		gcListWatcher(client, resource),
		nil,
		ResourceResyncTime,
		framework.ResourceEventHandlerFuncs{
			// add the event to the propagator's eventQueue.
			AddFunc: func(obj interface{}) {
				setObjectTypeMeta(obj)
				event := event{
					eventType: addEvent,
					obj:       obj,
				}
				p.eventQueue.Add(event)
			},
			UpdateFunc: func(oldObj, newObj interface{}) {
				setObjectTypeMeta(newObj)
				setObjectTypeMeta(oldObj)
				event := event{updateEvent, newObj, oldObj}
				p.eventQueue.Add(event)
			},
			DeleteFunc: func(obj interface{}) {
				// delta fifo may wrap the object in a cache.DeletedFinalStateUnknown, unwrap it
				if deletedFinalStateUnknown, ok := obj.(cache.DeletedFinalStateUnknown); ok {
					obj = deletedFinalStateUnknown.Obj
				}
				setObjectTypeMeta(obj)
				event := event{
					eventType: deleteEvent,
					obj:       obj,
				}
				p.eventQueue.Add(event)
			},
		},
	)
	return monitor, nil
}

func (m *DefaultRESTMapper) KindsFor(input unversioned.GroupVersionResource) ([]unversioned.GroupVersionKind, error) {
	resource := input.GroupVersion().WithResource(strings.ToLower(input.Resource))

	hasResource := len(resource.Resource) > 0
	hasGroup := len(resource.Group) > 0
	hasVersion := len(resource.Version) > 0

	if !hasResource {
		return nil, fmt.Errorf("a resource must be present, got: %v", resource)
	}

	ret := []unversioned.GroupVersionKind{}
	switch {
	// fully qualified.  Find the exact match
	case hasGroup && hasVersion:
		kind, exists := m.resourceToKind[resource]
		if exists {
			ret = append(ret, kind)
		}

	case hasGroup:
		requestedGroupResource := resource.GroupResource()
		for currResource, currKind := range m.resourceToKind {
			if currResource.GroupResource() == requestedGroupResource {
				ret = append(ret, currKind)
			}
		}

	case hasVersion:
		for currResource, currKind := range m.resourceToKind {
			if currResource.Version == resource.Version && currResource.Resource == resource.Resource {
				ret = append(ret, currKind)
			}
		}

	default:
		for currResource, currKind := range m.resourceToKind {
			if currResource.Resource == resource.Resource {
				ret = append(ret, currKind)
			}
		}
	}

	if len(ret) == 0 {
		return nil, fmt.Errorf("no kind %v has been defined; known resources: %v", resource, m.pluralToSingular)
	}

	sort.Sort(kindByPreferredGroupVersion{ret, m.defaultGroupVersions})
	return ret, nil
}

func resourceFor(mapper meta.RESTMapper, resourceArg string) unversioned.GroupVersionResource {
	fullySpecifiedGVR, groupResource := unversioned.ParseResourceArg(strings.ToLower(resourceArg))
	gvr := unversioned.GroupVersionResource{}
	if fullySpecifiedGVR != nil {
		gvr, _ = mapper.ResourceFor(*fullySpecifiedGVR)
	}
	if gvr.IsEmpty() {
		var err error
		gvr, err = mapper.ResourceFor(groupResource.WithVersion(""))
		if err != nil {
			return unversioned.GroupVersionResource{Resource: resourceArg}
		}
	}

	return gvr
}

// expandResourceShortcut will return the expanded version of resource
// (something that a pkg/api/meta.RESTMapper can understand), if it is
// indeed a shortcut. Otherwise, will return resource unmodified.
func expandResourceShortcut(resource unversioned.GroupVersionResource) unversioned.GroupVersionResource {
	if expanded, ok := shortForms[resource.Resource]; ok {
		// don't change the group or version that's already been specified
		resource.Resource = expanded
	}
	return resource
}

// expandResourceShortcut will return the expanded version of resource
// (something that a pkg/api/meta.RESTMapper can understand), if it is
// indeed a shortcut. Otherwise, will return resource unmodified.
func expandResourceShortcut(resource unversioned.GroupVersionResource) unversioned.GroupVersionResource {
	if expanded, ok := shortForms[resource.Resource]; ok {
		resource.Resource = expanded
		return resource
	}
	return resource
}

func (o *ResourceConfig) ResourceEnabled(resource unversioned.GroupVersionResource) bool {
	versionOverride, versionExists := o.GroupVersionResourceConfigs[resource.GroupVersion()]
	if !versionExists {
		return false
	}
	if !versionOverride.Enable {
		return false
	}

	if versionOverride.DisabledResources.Has(resource.Resource) {
		return false
	}

	if len(versionOverride.EnabledResources) > 0 {
		return versionOverride.EnabledResources.Has(resource.Resource)
	}

	return true
}

// estimateGrracefulTermination will estimate the graceful termination required for the specific entity in the namespace
func estimateGracefulTermination(kubeClient clientset.Interface, groupVersionResource unversioned.GroupVersionResource, ns string, namespaceDeletedAt unversioned.Time) (int64, error) {
	groupResource := groupVersionResource.GroupResource()
	glog.V(5).Infof("namespace controller - estimateGracefulTermination - group %s, resource: %s", groupResource.Group, groupResource.Resource)
	estimate := int64(0)
	var err error
	switch groupResource {
	case unversioned.GroupResource{Group: "", Resource: "pods"}:
		estimate, err = estimateGracefulTerminationForPods(kubeClient, ns)
	}
	if err != nil {
		return estimate, err
	}
	// determine if the estimate is greater than the deletion timestamp
	duration := time.Since(namespaceDeletedAt.Time)
	allowedEstimate := time.Duration(estimate) * time.Second
	if duration >= allowedEstimate {
		estimate = int64(0)
	}
	return estimate, nil
}

func monitorFor(p *Propagator, clientPool dynamic.ClientPool, resource unversioned.GroupVersionResource) (monitor, error) {
	// TODO: consider store in one storage.
	glog.V(6).Infof("create storage for resource %s", resource)
	var monitor monitor
	client, err := clientPool.ClientForGroupVersion(resource.GroupVersion())
	if err != nil {
		return monitor, err
	}
	monitor.store, monitor.controller = framework.NewInformer(
		gcListWatcher(client, resource),
		nil,
		ResourceResyncTime,
		framework.ResourceEventHandlerFuncs{
			// add the event to the propagator's eventQueue.
			AddFunc: func(obj interface{}) {
				event := event{
					eventType: addEvent,
					obj:       obj,
				}
				p.eventQueue.Add(event)
			},
			UpdateFunc: func(oldObj, newObj interface{}) {
				event := event{updateEvent, newObj, oldObj}
				p.eventQueue.Add(event)
			},
			DeleteFunc: func(obj interface{}) {
				// delta fifo may wrap the object in a cache.DeletedFinalStateUnknown, unwrap it
				if deletedFinalStateUnknown, ok := obj.(cache.DeletedFinalStateUnknown); ok {
					obj = deletedFinalStateUnknown.Obj
				}
				event := event{
					eventType: deleteEvent,
					obj:       obj,
				}
				p.eventQueue.Add(event)
			},
		},
	)
	return monitor, nil
}

// test the list and watch functions correctly converts the ListOptions
func TestGCListWatcher(t *testing.T) {
	testHandler := &fakeActionHandler{}
	srv, clientConfig := testServerAndClientConfig(testHandler.ServeHTTP)
	defer srv.Close()
	clientPool := dynamic.NewClientPool(clientConfig, dynamic.LegacyAPIPathResolverFunc)
	podResource := unversioned.GroupVersionResource{Version: "v1", Resource: "pods"}
	client, err := clientPool.ClientForGroupVersion(podResource.GroupVersion())
	if err != nil {
		t.Fatal(err)
	}
	lw := gcListWatcher(client, podResource)
	lw.Watch(api.ListOptions{ResourceVersion: "1"})
	lw.List(api.ListOptions{ResourceVersion: "1"})
	if e, a := 2, len(testHandler.actions); e != a {
		t.Errorf("expect %d requests, got %d", e, a)
	}
	if e, a := "resourceVersion=1", testHandler.actions[0].query; e != a {
		t.Errorf("expect %s, got %s", e, a)
	}
	if e, a := "resourceVersion=1", testHandler.actions[1].query; e != a {
		t.Errorf("expect %s, got %s", e, a)
	}
}

// TODO turn this into reusable method checking available resources
func contains(resourcesList map[string]*unversioned.APIResourceList, resource unversioned.GroupVersionResource) bool {
	if resourcesList == nil {
		return false
	}
	resourcesGroup, ok := resourcesList[resource.GroupVersion().String()]
	if !ok {
		return false
	}
	for _, item := range resourcesGroup.APIResources {
		if resource.Resource == item.Name {
			return true
		}
	}
	return false
}

func (m *DefaultRESTMapper) ResourcesFor(resource unversioned.GroupVersionResource) ([]unversioned.GroupVersionResource, error) {
	resource.Resource = strings.ToLower(resource.Resource)
	if resource.Version == runtime.APIVersionInternal {
		resource.Version = ""
	}

	hasResource := len(resource.Resource) > 0
	hasGroup := len(resource.Group) > 0
	hasVersion := len(resource.Version) > 0

	if !hasResource {
		return nil, fmt.Errorf("a resource must be present, got: %v", resource)
	}

	ret := []unversioned.GroupVersionResource{}
	switch {
	// fully qualified.  Find the exact match
	case hasGroup && hasVersion:
		for plural, singular := range m.pluralToSingular {
			if singular == resource {
				ret = append(ret, plural)
				break
			}
			if plural == resource {
				ret = append(ret, plural)
				break
			}
		}

	case hasGroup:
		requestedGroupResource := resource.GroupResource()
		for plural, singular := range m.pluralToSingular {
			if singular.GroupResource() == requestedGroupResource {
				ret = append(ret, plural)
			}
			if plural.GroupResource() == requestedGroupResource {
				ret = append(ret, plural)
			}
		}

	case hasVersion:
		for plural, singular := range m.pluralToSingular {
			if singular.Version == resource.Version && singular.Resource == resource.Resource {
				ret = append(ret, plural)
			}
			if plural.Version == resource.Version && plural.Resource == resource.Resource {
				ret = append(ret, plural)
			}
		}

	default:
		for plural, singular := range m.pluralToSingular {
			if singular.Resource == resource.Resource {
				ret = append(ret, plural)
			}
			if plural.Resource == resource.Resource {
				ret = append(ret, plural)
			}
		}
	}

	if len(ret) == 0 {
		return nil, &NoResourceMatchError{PartialResource: resource}
	}

	sort.Sort(resourceByPreferredGroupVersion{ret, m.defaultGroupVersions})
	return ret, nil
}

// patchResource divides PatchResource for easier unit testing
func patchResource(
	ctx api.Context,
	admit updateAdmissionFunc,
	timeout time.Duration,
	versionedObj runtime.Object,
	patcher rest.Patcher,
	name string,
	patchType api.PatchType,
	patchJS []byte,
	namer ScopeNamer,
	copier runtime.ObjectCopier,
	resource unversioned.GroupVersionResource,
	codec runtime.Codec,
) (runtime.Object, error) {

	namespace := api.NamespaceValue(ctx)

	var (
		originalObjJS        []byte
		originalPatchedObjJS []byte
		lastConflictErr      error
	)

	// applyPatch is called every time GuaranteedUpdate asks for the updated object,
	// and is given the currently persisted object as input.
	applyPatch := func(_ api.Context, _, currentObject runtime.Object) (runtime.Object, error) {
		// Make sure we actually have a persisted currentObject
		if hasUID, err := hasUID(currentObject); err != nil {
			return nil, err
		} else if !hasUID {
			return nil, errors.NewNotFound(resource.GroupResource(), name)
		}

		switch {
		case len(originalObjJS) == 0 || len(originalPatchedObjJS) == 0:
			// first time through,
			// 1. apply the patch
			// 2. save the originalJS and patchedJS to detect whether there were conflicting changes on retries
			if js, err := runtime.Encode(codec, currentObject); err != nil {
				return nil, err
			} else {
				originalObjJS = js
			}

			if js, err := getPatchedJS(patchType, originalObjJS, patchJS, versionedObj); err != nil {
				return nil, err
			} else {
				originalPatchedObjJS = js
			}

			objToUpdate := patcher.New()
			if err := runtime.DecodeInto(codec, originalPatchedObjJS, objToUpdate); err != nil {
				return nil, err
			}
			if err := checkName(objToUpdate, name, namespace, namer); err != nil {
				return nil, err
			}
			return objToUpdate, nil

		default:
			// on a conflict,
			// 1. build a strategic merge patch from originalJS and the patchedJS.  Different patch types can
			//    be specified, but a strategic merge patch should be expressive enough handle them.  Build the
			//    patch with this type to handle those cases.
			// 2. build a strategic merge patch from originalJS and the currentJS
			// 3. ensure no conflicts between the two patches
			// 4. apply the #1 patch to the currentJS object
			currentObjectJS, err := runtime.Encode(codec, currentObject)
			if err != nil {
				return nil, err
			}
			currentPatch, err := strategicpatch.CreateStrategicMergePatch(originalObjJS, currentObjectJS, versionedObj, strategicpatch.SMPatchVersionLatest)
			if err != nil {
				return nil, err
			}
			originalPatch, err := strategicpatch.CreateStrategicMergePatch(originalObjJS, originalPatchedObjJS, versionedObj, strategicpatch.SMPatchVersionLatest)
			if err != nil {
				return nil, err
			}

			diff1 := make(map[string]interface{})
			if err := json.Unmarshal(originalPatch, &diff1); err != nil {
				return nil, err
			}
			diff2 := make(map[string]interface{})
			if err := json.Unmarshal(currentPatch, &diff2); err != nil {
				return nil, err
			}
			hasConflicts, err := strategicpatch.HasConflicts(diff1, diff2)
			if err != nil {
				return nil, err
			}
			if hasConflicts {
				glog.V(4).Infof("patchResource failed for resource %s, because there is a meaningful conflict.\n diff1=%v\n, diff2=%v\n", name, diff1, diff2)
				// Return the last conflict error we got if we have one
				if lastConflictErr != nil {
					return nil, lastConflictErr
				}
				// Otherwise manufacture one of our own
//.........这里部分代码省略.........