Rename filenames for clear

pkg/cloudprovider/providers/azure/azure_cache.go

@@ -0,0 +1,81 @@
+/*
+Copyright 2017 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 azure
+
+import (
+	"sync"
+	"time"
+
+	"k8s.io/client-go/tools/cache"
+)
+
+type timedcacheEntry struct {
+	key  string
+	data interface{}
+}
+
+type timedcache struct {
+	store cache.Store
+	lock  sync.Mutex
+}
+
+// ttl time.Duration
+func newTimedcache(ttl time.Duration) timedcache {
+	return timedcache{
+		store: cache.NewTTLStore(cacheKeyFunc, ttl),
+	}
+}
+
+func cacheKeyFunc(obj interface{}) (string, error) {
+	return obj.(*timedcacheEntry).key, nil
+}
+
+func (t *timedcache) GetOrCreate(key string, createFunc func() interface{}) (interface{}, error) {
+	entry, exists, err := t.store.GetByKey(key)
+	if err != nil {
+		return nil, err
+	}
+	if exists {
+		return (entry.(*timedcacheEntry)).data, nil
+	}
+
+	t.lock.Lock()
+	defer t.lock.Unlock()
+	entry, exists, err = t.store.GetByKey(key)
+	if err != nil {
+		return nil, err
+	}
+	if exists {
+		return (entry.(*timedcacheEntry)).data, nil
+	}
+
+	if createFunc == nil {
+		return nil, nil
+	}
+	created := createFunc()
+	t.store.Add(&timedcacheEntry{
+		key:  key,
+		data: created,
+	})
+	return created, nil
+}
+
+func (t *timedcache) Delete(key string) {
+	_ = t.store.Delete(&timedcacheEntry{
+		key: key,
+	})
+}