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Diffstat (limited to 'vendor/k8s.io/apimachinery/pkg/util/cache/lruexpirecache.go')
-rw-r--r--vendor/k8s.io/apimachinery/pkg/util/cache/lruexpirecache.go102
1 files changed, 0 insertions, 102 deletions
diff --git a/vendor/k8s.io/apimachinery/pkg/util/cache/lruexpirecache.go b/vendor/k8s.io/apimachinery/pkg/util/cache/lruexpirecache.go
deleted file mode 100644
index f6b307aa6..000000000
--- a/vendor/k8s.io/apimachinery/pkg/util/cache/lruexpirecache.go
+++ /dev/null
@@ -1,102 +0,0 @@
-/*
-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 cache
-
-import (
- "sync"
- "time"
-
- "github.com/hashicorp/golang-lru"
-)
-
-// Clock defines an interface for obtaining the current time
-type Clock interface {
- Now() time.Time
-}
-
-// realClock implements the Clock interface by calling time.Now()
-type realClock struct{}
-
-func (realClock) Now() time.Time { return time.Now() }
-
-// LRUExpireCache is a cache that ensures the mostly recently accessed keys are returned with
-// a ttl beyond which keys are forcibly expired.
-type LRUExpireCache struct {
- // clock is used to obtain the current time
- clock Clock
-
- cache *lru.Cache
- lock sync.Mutex
-}
-
-// NewLRUExpireCache creates an expiring cache with the given size
-func NewLRUExpireCache(maxSize int) *LRUExpireCache {
- return NewLRUExpireCacheWithClock(maxSize, realClock{})
-}
-
-// NewLRUExpireCacheWithClock creates an expiring cache with the given size, using the specified clock to obtain the current time.
-func NewLRUExpireCacheWithClock(maxSize int, clock Clock) *LRUExpireCache {
- cache, err := lru.New(maxSize)
- if err != nil {
- // if called with an invalid size
- panic(err)
- }
- return &LRUExpireCache{clock: clock, cache: cache}
-}
-
-type cacheEntry struct {
- value interface{}
- expireTime time.Time
-}
-
-// Add adds the value to the cache at key with the specified maximum duration.
-func (c *LRUExpireCache) Add(key interface{}, value interface{}, ttl time.Duration) {
- c.lock.Lock()
- defer c.lock.Unlock()
- c.cache.Add(key, &cacheEntry{value, c.clock.Now().Add(ttl)})
-}
-
-// Get returns the value at the specified key from the cache if it exists and is not
-// expired, or returns false.
-func (c *LRUExpireCache) Get(key interface{}) (interface{}, bool) {
- c.lock.Lock()
- defer c.lock.Unlock()
- e, ok := c.cache.Get(key)
- if !ok {
- return nil, false
- }
- if c.clock.Now().After(e.(*cacheEntry).expireTime) {
- c.cache.Remove(key)
- return nil, false
- }
- return e.(*cacheEntry).value, true
-}
-
-// Remove removes the specified key from the cache if it exists
-func (c *LRUExpireCache) Remove(key interface{}) {
- c.lock.Lock()
- defer c.lock.Unlock()
- c.cache.Remove(key)
-}
-
-// Keys returns all the keys in the cache, even if they are expired. Subsequent calls to
-// get may return not found. It returns all keys from oldest to newest.
-func (c *LRUExpireCache) Keys() []interface{} {
- c.lock.Lock()
- defer c.lock.Unlock()
- return c.cache.Keys()
-}