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list.go
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list.go
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package expires
import (
"github.com/TeaOSLab/EdgeNode/internal/zero"
"sync"
)
type ItemMap = map[uint64]zero.Zero
type List struct {
expireMap map[int64]ItemMap // expires timestamp => map[id]ItemMap
itemsMap map[uint64]int64 // itemId => timestamp
mu sync.RWMutex
gcCallback func(itemId uint64)
gcBatchCallback func(itemIds ItemMap)
lastTimestamp int64
}
func NewList() *List {
var list = &List{
expireMap: map[int64]ItemMap{},
itemsMap: map[uint64]int64{},
}
SharedManager.Add(list)
return list
}
func NewSingletonList() *List {
var list = &List{
expireMap: map[int64]ItemMap{},
itemsMap: map[uint64]int64{},
}
return list
}
// Add 添加条目
// 如果条目已经存在,则覆盖
func (this *List) Add(itemId uint64, expiresAt int64) {
this.mu.Lock()
defer this.mu.Unlock()
if this.lastTimestamp == 0 || this.lastTimestamp > expiresAt {
this.lastTimestamp = expiresAt
}
// 是否已经存在
oldExpiresAt, ok := this.itemsMap[itemId]
if ok {
if oldExpiresAt == expiresAt {
return
}
delete(this.expireMap[oldExpiresAt], itemId)
if len(this.expireMap[oldExpiresAt]) == 0 {
delete(this.expireMap, oldExpiresAt)
}
}
expireItemMap, ok := this.expireMap[expiresAt]
if ok {
expireItemMap[itemId] = zero.New()
} else {
this.expireMap[expiresAt] = ItemMap{
itemId: zero.New(),
}
}
this.itemsMap[itemId] = expiresAt
}
func (this *List) Remove(itemId uint64) {
this.mu.Lock()
defer this.mu.Unlock()
this.removeItem(itemId)
}
func (this *List) ExpiresAt(itemId uint64) int64 {
this.mu.RLock()
defer this.mu.RUnlock()
return this.itemsMap[itemId]
}
func (this *List) GC(timestamp int64) ItemMap {
if this.lastTimestamp > timestamp+1 {
return nil
}
var itemMap = this.gcItems(timestamp)
if len(itemMap) == 0 {
return itemMap
}
if this.gcCallback != nil {
for itemId := range itemMap {
this.gcCallback(itemId)
}
}
if this.gcBatchCallback != nil {
this.gcBatchCallback(itemMap)
}
return itemMap
}
func (this *List) Clean() {
this.mu.Lock()
this.itemsMap = map[uint64]int64{}
this.expireMap = map[int64]ItemMap{}
this.mu.Unlock()
}
func (this *List) Count() int {
this.mu.RLock()
var count = len(this.itemsMap)
this.mu.RUnlock()
return count
}
func (this *List) OnGC(callback func(itemId uint64)) *List {
this.gcCallback = callback
return this
}
func (this *List) OnGCBatch(callback func(itemMap ItemMap)) *List {
this.gcBatchCallback = callback
return this
}
func (this *List) ExpireMap() map[int64]ItemMap {
return this.expireMap
}
func (this *List) ItemsMap() map[uint64]int64 {
return this.itemsMap
}
func (this *List) LastTimestamp() int64 {
return this.lastTimestamp
}
func (this *List) removeItem(itemId uint64) {
expiresAt, ok := this.itemsMap[itemId]
if !ok {
return
}
delete(this.itemsMap, itemId)
expireItemMap, ok := this.expireMap[expiresAt]
if ok {
delete(expireItemMap, itemId)
if len(expireItemMap) == 0 {
delete(this.expireMap, expiresAt)
}
}
}
func (this *List) gcItems(timestamp int64) ItemMap {
this.mu.RLock()
expireItemsMap, ok := this.expireMap[timestamp]
this.mu.RUnlock()
if ok {
this.mu.Lock()
for itemId := range expireItemsMap {
delete(this.itemsMap, itemId)
}
delete(this.expireMap, timestamp)
this.mu.Unlock()
}
return expireItemsMap
}