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Beego/cache/cache.go
2014-08-04 17:39:14 +08:00

75 lines
2.1 KiB
Go

// Beego (http://beego.me/)
//
// @description beego is an open-source, high-performance web framework for the Go programming language.
//
// @link http://github.com/astaxie/beego for the canonical source repository
//
// @license http://github.com/astaxie/beego/blob/master/LICENSE
//
// @authors astaxie
package cache
import (
"fmt"
)
// Cache interface contains all behaviors for cache adapter.
// usage:
// cache.Register("file",cache.NewFileCache()) // this operation is run in init method of file.go.
// c,err := cache.NewCache("file","{....}")
// c.Put("key",value,3600)
// v := c.Get("key")
//
// c.Incr("counter") // now is 1
// c.Incr("counter") // now is 2
// count := c.Get("counter").(int)
type Cache interface {
// get cached value by key.
Get(key string) interface{}
// set cached value with key and expire time.
Put(key string, val interface{}, timeout int64) error
// delete cached value by key.
Delete(key string) error
// increase cached int value by key, as a counter.
Incr(key string) error
// decrease cached int value by key, as a counter.
Decr(key string) error
// check if cached value exists or not.
IsExist(key string) bool
// clear all cache.
ClearAll() error
// start gc routine based on config string settings.
StartAndGC(config string) error
}
var adapters = make(map[string]Cache)
// Register makes a cache adapter available by the adapter name.
// If Register is called twice with the same name or if driver is nil,
// it panics.
func Register(name string, adapter Cache) {
if adapter == nil {
panic("cache: Register adapter is nil")
}
if _, ok := adapters[name]; ok {
panic("cache: Register called twice for adapter " + name)
}
adapters[name] = adapter
}
// Create a new cache driver by adapter name and config string.
// config need to be correct JSON as string: {"interval":360}.
// it will start gc automatically.
func NewCache(adapterName, config string) (adapter Cache, e error) {
adapter, ok := adapters[adapterName]
if !ok {
e = fmt.Errorf("cache: unknown adapter name %q (forgot to import?)", adapterName)
return
}
err := adapter.StartAndGC(config)
if err != nil {
adapter = nil
}
return
}