change cluster schema (#2026)

* change cluster schema

* change cluster schema

vendor/sigs.k8s.io/kubefed/pkg/controller/util/handlers.go

@@ -0,0 +1,52 @@
+/*
+Copyright 2016 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package util
+
+import (
+	"reflect"
+
+	pkgruntime "k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/client-go/tools/cache"
+)
+
+// Returns cache.ResourceEventHandlerFuncs that trigger the given function
+// on all object changes.
+func NewTriggerOnAllChanges(triggerFunc func(pkgruntime.Object)) *cache.ResourceEventHandlerFuncs {
+	return &cache.ResourceEventHandlerFuncs{
+		DeleteFunc: func(old interface{}) {
+			if deleted, ok := old.(cache.DeletedFinalStateUnknown); ok {
+				// This object might be stale but ok for our current usage.
+				old = deleted.Obj
+				if old == nil {
+					return
+				}
+			}
+			oldObj := old.(pkgruntime.Object)
+			triggerFunc(oldObj)
+		},
+		AddFunc: func(cur interface{}) {
+			curObj := cur.(pkgruntime.Object)
+			triggerFunc(curObj)
+		},
+		UpdateFunc: func(old, cur interface{}) {
+			curObj := cur.(pkgruntime.Object)
+			if !reflect.DeepEqual(old, cur) {
+				triggerFunc(curObj)
+			}
+		},
+	}
+}