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68 lines
1.6 KiB
Go
68 lines
1.6 KiB
Go
/*
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Copyright 2020 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 kubelet
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import (
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"sync"
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"time"
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"github.com/golang/groupcache/lru"
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"k8s.io/apimachinery/pkg/types"
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)
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// timeCache stores a time keyed by uid
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type timeCache struct {
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lock sync.Mutex
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cache *lru.Cache
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}
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// maxTimeCacheEntries is the cache entry number in lru cache. 1000 is a proper number
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// for our 100 pods per node target. If we support more pods per node in the future, we
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// may want to increase the number.
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const maxTimeCacheEntries = 1000
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func newTimeCache() *timeCache {
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return &timeCache{cache: lru.New(maxTimeCacheEntries)}
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}
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func (c *timeCache) Add(uid types.UID, t time.Time) {
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c.lock.Lock()
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defer c.lock.Unlock()
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c.cache.Add(uid, t)
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}
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func (c *timeCache) Remove(uid types.UID) {
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c.lock.Lock()
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defer c.lock.Unlock()
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c.cache.Remove(uid)
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}
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func (c *timeCache) Get(uid types.UID) (time.Time, bool) {
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c.lock.Lock()
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defer c.lock.Unlock()
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value, ok := c.cache.Get(uid)
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if !ok {
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return time.Time{}, false
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}
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t, ok := value.(time.Time)
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if !ok {
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return time.Time{}, false
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}
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return t, true
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}
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