mirror of
https://github.com/astaxie/beego.git
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219 lines
4.5 KiB
Go
219 lines
4.5 KiB
Go
package cache
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import (
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"encoding/json"
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"errors"
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"fmt"
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"sync"
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"time"
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)
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var (
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// clock time of recycling the expired cache items in memory.
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DefaultEvery int = 60 // 1 minute
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)
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// Memory cache item.
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type MemoryItem struct {
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val interface{}
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Lastaccess time.Time
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expired int64
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}
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// Memory cache adapter.
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// it contains a RW locker for safe map storage.
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type MemoryCache struct {
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lock sync.RWMutex
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dur time.Duration
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items map[string]*MemoryItem
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Every int // run an expiration check Every clock time
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}
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// NewMemoryCache returns a new MemoryCache.
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func NewMemoryCache() *MemoryCache {
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cache := MemoryCache{items: make(map[string]*MemoryItem)}
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return &cache
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}
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// Get cache from memory.
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// if non-existed or expired, return nil.
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func (bc *MemoryCache) Get(name string) interface{} {
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bc.lock.RLock()
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defer bc.lock.RUnlock()
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itm, ok := bc.items[name]
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if !ok {
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return nil
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}
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if (time.Now().Unix() - itm.Lastaccess.Unix()) > itm.expired {
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go bc.Delete(name)
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return nil
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}
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return itm.val
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}
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// Put cache to memory.
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// if expired is 0, it will be cleaned by next gc operation ( default gc clock is 1 minute).
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func (bc *MemoryCache) Put(name string, value interface{}, expired int64) error {
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bc.lock.Lock()
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defer bc.lock.Unlock()
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t := MemoryItem{
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val: value,
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Lastaccess: time.Now(),
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expired: expired,
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}
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bc.items[name] = &t
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return nil
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}
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/// Delete cache in memory.
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func (bc *MemoryCache) Delete(name string) error {
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bc.lock.Lock()
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defer bc.lock.Unlock()
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if _, ok := bc.items[name]; !ok {
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return errors.New("key not exist")
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}
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delete(bc.items, name)
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_, valid := bc.items[name]
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if valid {
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return errors.New("delete key error")
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}
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return nil
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}
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// Increase cache counter in memory.
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// it supports int,int64,int32,uint,uint64,uint32.
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func (bc *MemoryCache) Incr(key string) error {
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bc.lock.RLock()
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defer bc.lock.RUnlock()
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itm, ok := bc.items[key]
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if !ok {
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return errors.New("key not exist")
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}
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switch itm.val.(type) {
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case int:
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itm.val = itm.val.(int) + 1
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case int64:
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itm.val = itm.val.(int64) + 1
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case int32:
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itm.val = itm.val.(int32) + 1
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case uint:
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itm.val = itm.val.(uint) + 1
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case uint32:
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itm.val = itm.val.(uint32) + 1
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case uint64:
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itm.val = itm.val.(uint64) + 1
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default:
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return errors.New("item val is not int int64 int32")
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}
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return nil
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}
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// Decrease counter in memory.
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func (bc *MemoryCache) Decr(key string) error {
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bc.lock.RLock()
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defer bc.lock.RUnlock()
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itm, ok := bc.items[key]
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if !ok {
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return errors.New("key not exist")
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}
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switch itm.val.(type) {
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case int:
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itm.val = itm.val.(int) - 1
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case int64:
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itm.val = itm.val.(int64) - 1
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case int32:
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itm.val = itm.val.(int32) - 1
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case uint:
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if itm.val.(uint) > 0 {
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itm.val = itm.val.(uint) - 1
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} else {
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return errors.New("item val is less than 0")
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}
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case uint32:
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if itm.val.(uint32) > 0 {
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itm.val = itm.val.(uint32) - 1
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} else {
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return errors.New("item val is less than 0")
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}
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case uint64:
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if itm.val.(uint64) > 0 {
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itm.val = itm.val.(uint64) - 1
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} else {
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return errors.New("item val is less than 0")
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}
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default:
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return errors.New("item val is not int int64 int32")
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}
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return nil
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}
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// check cache exist in memory.
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func (bc *MemoryCache) IsExist(name string) bool {
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bc.lock.RLock()
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defer bc.lock.RUnlock()
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_, ok := bc.items[name]
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return ok
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}
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// delete all cache in memory.
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func (bc *MemoryCache) ClearAll() error {
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bc.lock.Lock()
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defer bc.lock.Unlock()
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bc.items = make(map[string]*MemoryItem)
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return nil
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}
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// start memory cache. it will check expiration in every clock time.
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func (bc *MemoryCache) StartAndGC(config string) error {
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var cf map[string]int
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json.Unmarshal([]byte(config), &cf)
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if _, ok := cf["interval"]; !ok {
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cf = make(map[string]int)
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cf["interval"] = DefaultEvery
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}
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dur, err := time.ParseDuration(fmt.Sprintf("%ds", cf["interval"]))
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if err != nil {
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return err
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}
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bc.Every = cf["interval"]
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bc.dur = dur
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go bc.vaccuum()
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return nil
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}
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// check expiration.
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func (bc *MemoryCache) vaccuum() {
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if bc.Every < 1 {
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return
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}
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for {
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<-time.After(bc.dur)
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if bc.items == nil {
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return
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}
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for name, _ := range bc.items {
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bc.item_expired(name)
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}
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}
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}
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// item_expired returns true if an item is expired.
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func (bc *MemoryCache) item_expired(name string) bool {
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bc.lock.Lock()
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defer bc.lock.Unlock()
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itm, ok := bc.items[name]
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if !ok {
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return true
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}
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sec := time.Now().Unix() - itm.Lastaccess.Unix()
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if sec >= itm.expired {
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delete(bc.items, name)
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return true
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}
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return false
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}
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func init() {
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Register("memory", NewMemoryCache())
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}
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