76 lines
1.2 KiB
Go
76 lines
1.2 KiB
Go
package cachex
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import (
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"errors"
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"sync"
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"time"
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)
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// 应用内缓存
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// 特点
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// 1.全局单实例
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// 到设定的点就删除
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type cache struct {
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store sync.Map
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}
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var one sync.Once
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var c *cache
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type cacheData struct {
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key string
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data interface{}
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expire time.Time
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}
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var ErrorEmpty error = errors.New("empty cache")
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func NewCache() *cache {
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one.Do(func() {
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c = &cache{}
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go func() {
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for {
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c.store.Range(func(key, value interface{}) bool {
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if value.(*cacheData).expire.Before(time.Now()) {
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c.store.Delete(key)
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}
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return true
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})
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time.Sleep(time.Second * 5)
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}
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}()
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})
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return c
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}
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// 设置缓存
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func (c *cache) Set(key string, value interface{}, expire time.Duration) {
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if expire == 0 {
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expire = time.Hour * 24 * 365
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}
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cd := &cacheData{key, value, time.Now().Add(expire)}
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c.store.Store(key, cd)
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}
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// 读取缓存
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func (c *cache) Get(key string) (interface{}, error) {
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if v, ok := c.store.Load(key); ok {
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cc := v.(*cacheData)
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if cc.expire.Before(time.Now()) {
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c.store.Delete(key)
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return nil, ErrorEmpty
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}
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return cc.data, nil
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}
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return nil, ErrorEmpty
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}
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// 删除缓存
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func (c *cache) Delete(key string) {
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c.store.Delete(key)
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}
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