mirror of
https://github.com/MetaCubeX/mihomo.git
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114 lines
1.8 KiB
Go
114 lines
1.8 KiB
Go
package pool
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import (
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"context"
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"runtime"
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"time"
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)
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type Factory[T any] func(context.Context) (T, error)
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type entry[T any] struct {
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elm T
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time time.Time
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}
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type Option[T any] func(*pool[T])
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// WithEvict set the evict callback
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func WithEvict[T any](cb func(T)) Option[T] {
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return func(p *pool[T]) {
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p.evict = cb
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}
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}
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// WithAge defined element max age (millisecond)
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func WithAge[T any](maxAge int64) Option[T] {
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return func(p *pool[T]) {
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p.maxAge = maxAge
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}
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}
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// WithSize defined max size of Pool
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func WithSize[T any](maxSize int) Option[T] {
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return func(p *pool[T]) {
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p.ch = make(chan *entry[T], maxSize)
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}
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}
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// Pool is for GC, see New for detail
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type Pool[T any] struct {
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*pool[T]
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}
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type pool[T any] struct {
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ch chan *entry[T]
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factory Factory[T]
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evict func(T)
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maxAge int64
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}
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func (p *pool[T]) GetContext(ctx context.Context) (T, error) {
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now := time.Now()
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for {
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select {
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case item := <-p.ch:
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elm := item
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if p.maxAge != 0 && now.Sub(item.time).Milliseconds() > p.maxAge {
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if p.evict != nil {
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p.evict(elm.elm)
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}
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continue
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}
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return elm.elm, nil
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default:
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return p.factory(ctx)
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}
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}
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}
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func (p *pool[T]) Get() (T, error) {
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return p.GetContext(context.Background())
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}
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func (p *pool[T]) Put(item T) {
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e := &entry[T]{
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elm: item,
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time: time.Now(),
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}
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select {
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case p.ch <- e:
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return
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default:
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// pool is full
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if p.evict != nil {
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p.evict(item)
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}
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return
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}
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}
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func recycle[T any](p *Pool[T]) {
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for item := range p.pool.ch {
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if p.pool.evict != nil {
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p.pool.evict(item.elm)
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}
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}
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}
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func New[T any](factory Factory[T], options ...Option[T]) *Pool[T] {
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p := &pool[T]{
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ch: make(chan *entry[T], 10),
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factory: factory,
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}
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for _, option := range options {
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option(p)
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}
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P := &Pool[T]{p}
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runtime.SetFinalizer(P, recycle[T])
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return P
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}
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