- Weakref for golang
- Support weakref map (weak value)
- Check if value available
A weakref instance
func (*WeakRef)Ok()(bool)Check if this weakref is available
func (*WeakRef)Value()(interface{})Get the value of the weakref
func NewWeakRef(ptr interface{})(w *WeakRef)Create a instance of weakref.WeakRef, ptr must be a type of pointer or unsafe.Pointer
A weak value map, if the value is not available, the map will auto remove the key
The map is theard safty
func (*Map)Len()()func (*Map)Has(k interface{})(bool)Check if key-value exists
func (*Map)Get(k interface{})(interface{})Get value of key
func (*Map)Set(k interface{}, v interface{})(interface{})Set value of key, and return the value
func (*Map)GetOrSet(k interface{}, setter func()(interface{}))(interface{})Get value of key, if key not exists, set the value returned by setter, and return the value
func (*Map)Pop(k interface{})(interface{})Remove value of the key, and return the value
func (*Map)Reset()Reset the map (clear all of the key-value)
func (*Map)AsMap()(map[interface{}]interface{})Create a new builtin.map, and copy all the key-value from weakref.Map
func NewMap()(*Map)Create a new empty weakref.Map
import (
weakref "github.com/zyxkad/weakref"
)
type T struct{
id int
name string
}
var global_cache_t *weakref.WeakRef
func GetT()(*T){
if global_cache_t.Ok(){ // If this weakref is available
return global_cache_t.Value().(*T) // type assertion
}
t := &T{
id: 1,
name: "name",
}
global_cache_t = weakref.NewWeakRef(t) // create a new weakref
return t
}
// ...
func main(){
for {
// ...
if true {
t := GetT()
do_something_with_t(t)
}
// ...
}
}import (
weakref "github.com/zyxkad/weakref"
)
type User struct{
name string
score int
}
var weak_cache *weakref.Map = weakref.NewMap()
func ReadUserFromFile(name string)(u *User){
// ...
return
}
func GetUser(name string)(*User){
return weak_cache.GetOrSet(name, func()(interface{}){
return ReadUserFromFile(name)
}).(*User)
}
func main(){
for {
// ...
{
a := GetUser("a")
a.score++
SaveUser(a)
}
{
b := GetUser("b")
b.score--
SaveUser(b)
}
// ...
}
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