61 lines
1.6 KiB
Go
61 lines
1.6 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 cache
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import (
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"hash/fnv"
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"time"
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)
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// split cache lookups across N striped caches
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type stripedCache struct {
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stripeCount uint32
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hashFunc func(string) uint32
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caches []cache
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}
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type hashFunc func(string) uint32
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type newCacheFunc func() cache
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func newStripedCache(stripeCount int, hash hashFunc, newCacheFunc newCacheFunc) cache {
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caches := []cache{}
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for i := 0; i < stripeCount; i++ {
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caches = append(caches, newCacheFunc())
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}
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return &stripedCache{
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stripeCount: uint32(stripeCount),
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hashFunc: hash,
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caches: caches,
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}
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}
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func (c *stripedCache) get(key string) (*cacheRecord, bool) {
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return c.caches[c.hashFunc(key)%c.stripeCount].get(key)
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}
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func (c *stripedCache) set(key string, value *cacheRecord, ttl time.Duration) {
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c.caches[c.hashFunc(key)%c.stripeCount].set(key, value, ttl)
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}
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func (c *stripedCache) remove(key string) {
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c.caches[c.hashFunc(key)%c.stripeCount].remove(key)
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}
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func fnvHashFunc(key string) uint32 {
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f := fnv.New32()
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f.Write([]byte(key))
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return f.Sum32()
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}
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