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concurrent_lru.go
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concurrent_lru.go
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// Copyright (C) 2020-2021, IrineSistiana
//
// This file is part of mosdns.
//
// mosdns is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// mosdns is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package concurrent_lru
import (
lru2 "github.com/IrineSistiana/mosdns/v3/dispatcher/pkg/lru"
"hash/maphash"
"sync"
)
type ConcurrentLRU struct {
seed maphash.Seed
l []*shardedLRU
}
func NewConcurrentLRU(
shardNum, maxSizePerShard int,
onEvict func(key string, v interface{}),
onGet func(key string, v interface{}) interface{},
) *ConcurrentLRU {
cl := &ConcurrentLRU{
seed: maphash.MakeSeed(),
l: make([]*shardedLRU, shardNum),
}
for i := range cl.l {
cl.l[i] = &shardedLRU{
onGet: onGet,
lru: lru2.NewLRU(maxSizePerShard, onEvict),
}
}
return cl
}
func (c *ConcurrentLRU) Add(key string, v interface{}) {
sl := c.getShardedLRU(key)
sl.Add(key, v)
}
func (c *ConcurrentLRU) Del(key string) {
sl := c.getShardedLRU(key)
sl.Del(key)
}
func (c *ConcurrentLRU) Clean(f func(key string, v interface{}) (remove bool)) (removed int) {
for i := range c.l {
removed += c.l[i].Clean(f)
}
return removed
}
func (c *ConcurrentLRU) Get(key string) (v interface{}, ok bool) {
sl := c.getShardedLRU(key)
v, ok = sl.Get(key)
return
}
func (c *ConcurrentLRU) Len() int {
sum := 0
for _, lru := range c.l {
sum += lru.Len()
}
return sum
}
func (c *ConcurrentLRU) shardNum() int {
return len(c.l)
}
func (c *ConcurrentLRU) getShardedLRU(key string) *shardedLRU {
h := maphash.Hash{}
h.SetSeed(c.seed)
h.WriteString(key)
n := h.Sum64() % uint64(c.shardNum())
return c.l[n]
}
type shardedLRU struct {
onGet func(key string, v interface{}) interface{}
sync.Mutex
lru *lru2.LRU
}
func (sl *shardedLRU) Add(key string, v interface{}) {
sl.Lock()
defer sl.Unlock()
sl.lru.Add(key, v)
}
func (sl *shardedLRU) Del(key string) {
sl.Lock()
defer sl.Unlock()
sl.lru.Del(key)
}
func (sl *shardedLRU) Clean(f func(key string, v interface{}) (remove bool)) (removed int) {
sl.Lock()
defer sl.Unlock()
return sl.lru.Clean(f)
}
func (sl *shardedLRU) Get(key string) (v interface{}, ok bool) {
sl.Lock()
defer sl.Unlock()
v, ok = sl.lru.Get(key)
if ok && sl.onGet != nil {
v = sl.onGet(key, v)
}
return
}
func (sl *shardedLRU) Len() int {
sl.Lock()
defer sl.Unlock()
return sl.lru.Len()
}