mirror of https://github.com/k3s-io/k3s
82 lines
1.7 KiB
Go
82 lines
1.7 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package azure
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import (
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"sync"
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"time"
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"k8s.io/client-go/tools/cache"
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)
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type timedcacheEntry struct {
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key string
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data interface{}
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}
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type timedcache struct {
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store cache.Store
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lock sync.Mutex
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}
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// ttl time.Duration
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func newTimedcache(ttl time.Duration) timedcache {
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return timedcache{
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store: cache.NewTTLStore(cacheKeyFunc, ttl),
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}
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}
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func cacheKeyFunc(obj interface{}) (string, error) {
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return obj.(*timedcacheEntry).key, nil
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}
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func (t *timedcache) GetOrCreate(key string, createFunc func() interface{}) (interface{}, error) {
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entry, exists, err := t.store.GetByKey(key)
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if err != nil {
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return nil, err
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}
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if exists {
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return (entry.(*timedcacheEntry)).data, nil
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}
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t.lock.Lock()
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defer t.lock.Unlock()
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entry, exists, err = t.store.GetByKey(key)
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if err != nil {
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return nil, err
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}
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if exists {
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return (entry.(*timedcacheEntry)).data, nil
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}
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if createFunc == nil {
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return nil, nil
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}
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created := createFunc()
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t.store.Add(&timedcacheEntry{
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key: key,
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data: created,
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})
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return created, nil
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}
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func (t *timedcache) Delete(key string) {
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_ = t.store.Delete(&timedcacheEntry{
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key: key,
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})
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}
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