change cluster schema (#2026)

* change cluster schema

* change cluster schema

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

@@ -0,0 +1,75 @@
+/*
+Copyright 2019 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 (
+	"sync"
+)
+
+type SafeMap struct {
+	sync.RWMutex
+	m map[string]interface{}
+}
+
+func NewSafeMap() *SafeMap {
+	return &SafeMap{
+		m: make(map[string]interface{}),
+	}
+}
+
+func (s *SafeMap) Store(key string, value interface{}) {
+	s.Lock()
+	defer s.Unlock()
+	s.m[key] = value
+}
+
+func (s *SafeMap) Get(key string) (interface{}, bool) {
+	s.RLock()
+	defer s.RUnlock()
+	value, ok := s.m[key]
+	return value, ok
+}
+
+func (s *SafeMap) GetAll() []interface{} {
+	s.RLock()
+	defer s.RUnlock()
+	vals := []interface{}{}
+	for _, val := range s.m {
+		vals = append(vals, val)
+	}
+	return vals
+}
+
+func (s *SafeMap) Delete(key string) {
+	s.Lock()
+	defer s.Unlock()
+	delete(s.m, key)
+}
+
+func (s *SafeMap) DeleteAll() {
+	s.Lock()
+	defer s.Unlock()
+	for key := range s.m {
+		delete(s.m, key)
+	}
+}
+
+func (s *SafeMap) Size() int {
+	s.Lock()
+	defer s.Unlock()
+	return len(s.m)
+}