1 特性
-
Supports expirable Cache, LFU, LRU and ARC.
-
Goroutine safe.
-
Supports event handlers which evict, purge, and add entry. (Optional)
-
Automatically load cache if it doesn't exists. (Optional)
2 使用
Loading Cache
If specified LoaderFunc, values are automatically loaded by the cache, and are stored in the cache until either evicted or manually invalidated.
func main() {
gc := gcache.New(10).
LRU().
LoaderFunc(func(key interface{}) (interface{}, error) {
return "value", nil
}).
Build()
v, _ := gc.Get("key")
// output: "value"
fmt.Println(v)
}
GCache coordinates cache fills such that only one load in one process of an entire replicated set of processes populates the cache, then multiplexes the loaded value to all callers.
Event handlers
Event handler for evict the entry.
func main() {
gc := gcache.New(2).
EvictedFunc(func(key, value interface{}) {
fmt.Println("evicted key:", key)
}).
Build()
for i := 0; i < 3; i++ {
gc.Set(i, i*i)
}
}
Added handler
Event handler for add the entry.
func main() {
gc := gcache.New(2).
AddedFunc(func(key, value interface{}) {
fmt.Println("added key:", key)
}).
Build()
for i := 0; i < 3; i++ {
gc.Set(i, i*i)
}
}
Expirable cache
func main() {
// LRU cache, size: 10, expiration: after a hour
gc := gcache.New(10).
LRU().
Expiration(time.Hour).
Build()
}