标签:缓存 return err nil UserId func 简单 GO query
ICacheQueryBase
type ICacheQueryBase interface {
GetCacheKey() string
}
CacheMiddleware
package entity_cache
import (
"encoding/json"
"errors"
"github.com/coocood/freecache"
"reflect"
)
type CacheCore struct {
}
func (c *CacheCore) OnHit(key string) ([]byte, bool) {
resp, err := LocalCache.Get([]byte(key))
if err == freecache.ErrNotFound {
return nil, false
}
if err != nil {
//log
return nil, false
}
return resp, true
}
func (c *CacheCore) Set(key string, data []byte, expireSeconds int) {
err := LocalCache.Set([]byte(key), []byte(data), expireSeconds)
if err != nil {
//log
}
}
type CacheMiddleware struct {
}
func (c *CacheMiddleware) Query(query ICacheQueryBase, reload func (query ICacheQueryBase) ( interface {}, error), refV interface {}) error {
cacheCore := CacheCore{}
if cacheBytes, isHit := cacheCore.OnHit(query.GetCacheKey()); isHit {
err := json.Unmarshal(cacheBytes, &refV)
if err == nil {
return nil
} else {
//log
}
}
resp, err := reload(query)
if err != nil {
return err
}
va := reflect.ValueOf(refV).Elem()
if va.IsValid() {
va.Set(reflect.ValueOf(resp))
} else {
return errors.New( "err type,refV must be pointer" )
}
respByte, err := json.Marshal(resp)
if err != nil {
//log
}
cacheCore.Set(query.GetCacheKey(), respByte, 60)
return nil
}
Cache_test
type UserEntity struct {
UserId int64
UserName string
}
type UserQuery struct {
UserId int64
}
func (c UserQuery) GetCacheKey() string {
idStr := strconv.FormatInt(c.UserId, 10)
return "User" + idStr
}
func TestCache(t *testing.T) {
Init()
var userId int64 = 99
query := UserQuery{
UserId: userId,
}
var respV UserEntity
medware := CacheMiddleware{}
err := medware.Query(query, func(query ICacheQueryBase) (interface{}, error) {
q := query.(UserQuery)
return UserEntity{
UserId: q.UserId,
UserName: "UUUUUUUUUUUUU",
}, nil
}, &respV)
if err != nil {
//
}
var respV2 UserEntity
err = medware.Query(query, func(query ICacheQueryBase) (interface{}, error) {
q := query.(UserQuery)
return UserEntity{
UserId: q.UserId,
UserName: "UUUUUUUUUUUUU",
}, nil
}, &respV2)
if err != nil {
//
}
fmt.Println(respV2)
}
标签:缓存,return,err,nil,UserId,func,简单,GO,query 来源: https://www.cnblogs.com/FCmmmmmm/p/16638928.html
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