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94 lines
2.2 KiB
94 lines
2.2 KiB
// Copyright © 2024 OpenIM. All rights reserved.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package lru
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import (
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"sync"
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"time"
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"github.com/hashicorp/golang-lru/v2/expirable"
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)
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func NewExpirationLRU[K comparable, V any](size int, successTTL, failedTTL time.Duration, target Target, onEvict EvictCallback[K, V]) LRU[K, V] {
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var cb expirable.EvictCallback[K, *expirationLruItem[V]]
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if onEvict != nil {
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cb = func(key K, value *expirationLruItem[V]) {
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onEvict(key, value.value)
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}
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}
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core := expirable.NewLRU[K, *expirationLruItem[V]](size, cb, successTTL)
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return &ExpirationLRU[K, V]{
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core: core,
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successTTL: successTTL,
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failedTTL: failedTTL,
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target: target,
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}
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}
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type expirationLruItem[V any] struct {
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lock sync.RWMutex
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err error
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value V
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}
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type ExpirationLRU[K comparable, V any] struct {
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lock sync.Mutex
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core *expirable.LRU[K, *expirationLruItem[V]]
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successTTL time.Duration
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failedTTL time.Duration
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target Target
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}
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func (x *ExpirationLRU[K, V]) Get(key K, fetch func() (V, error)) (V, error) {
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x.lock.Lock()
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v, ok := x.core.Get(key)
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if ok {
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x.lock.Unlock()
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x.target.IncrGetSuccess()
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v.lock.RLock()
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defer v.lock.RUnlock()
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return v.value, v.err
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} else {
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v = &expirationLruItem[V]{}
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x.core.Add(key, v)
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v.lock.Lock()
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x.lock.Unlock()
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defer v.lock.Unlock()
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v.value, v.err = fetch()
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if v.err == nil {
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x.target.IncrGetSuccess()
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} else {
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x.target.IncrGetFailed()
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x.core.Remove(key)
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}
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return v.value, v.err
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}
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}
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func (x *ExpirationLRU[K, V]) Del(key K) bool {
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x.lock.Lock()
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ok := x.core.Remove(key)
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x.lock.Unlock()
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if ok {
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x.target.IncrDelHit()
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} else {
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x.target.IncrDelNotFound()
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}
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return ok
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}
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func (x *ExpirationLRU[K, V]) Stop() {
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}
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