|
|
@ -1,32 +1,26 @@
|
|
|
|
package cache
|
|
|
|
package cache
|
|
|
|
|
|
|
|
|
|
|
|
import (
|
|
|
|
// go-cache is an in-memory key:value store/cache similar to memcached that is
|
|
|
|
"fmt"
|
|
|
|
// suitable for applications running on a single machine. Any object can be stored,
|
|
|
|
"reflect"
|
|
|
|
// for a given duration or forever, and the cache can be used safely by multiple
|
|
|
|
"runtime"
|
|
|
|
// goroutines.
|
|
|
|
"sync"
|
|
|
|
|
|
|
|
"time"
|
|
|
|
|
|
|
|
)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
// go-cache is an in-memory key:value store/cache similar to memcached that is suitable for
|
|
|
|
|
|
|
|
// applications running on a single machine. Any object can be stored, for a given duration
|
|
|
|
|
|
|
|
// or forever, and the cache can be used safely by multiple goroutines.
|
|
|
|
|
|
|
|
//
|
|
|
|
//
|
|
|
|
// Installation:
|
|
|
|
// == Installation
|
|
|
|
// goinstall github.com/pmylund/go-cache
|
|
|
|
// goinstall github.com/pmylund/go-cache
|
|
|
|
//
|
|
|
|
//
|
|
|
|
// Usage:
|
|
|
|
// == Usage
|
|
|
|
// import "github.com/pmylund/go-cache"
|
|
|
|
// import "github.com/pmylund/go-cache"
|
|
|
|
//
|
|
|
|
//
|
|
|
|
// // Create a cache with a default expiration time of 5 minutes, and which purges
|
|
|
|
// // Create a cache with a default expiration time of 5 minutes, and which
|
|
|
|
// // expired items every 30 seconds
|
|
|
|
// // purges expired items every 30 seconds
|
|
|
|
// c := cache.New(5*time.Minute, 30*time.Second)
|
|
|
|
// c := cache.New(5*time.Minute, 30*time.Second)
|
|
|
|
//
|
|
|
|
//
|
|
|
|
// // Set the value of the key "foo" to "bar", with the default expiration time
|
|
|
|
// // Set the value of the key "foo" to "bar", with the default expiration time
|
|
|
|
// c.Set("foo", "bar", 0)
|
|
|
|
// c.Set("foo", "bar", 0)
|
|
|
|
//
|
|
|
|
//
|
|
|
|
// // Set the value of the key "baz" to "yes", with no expiration time (the item
|
|
|
|
// // Set the value of the key "baz" to "yes", with no expiration time
|
|
|
|
// // won't be removed until it is re-set, or removed using c.Delete("baz")
|
|
|
|
// // (the item won't be removed until it is re-set, or removed using
|
|
|
|
|
|
|
|
// // c.Delete("baz")
|
|
|
|
// c.Set("baz", "yes", -1)
|
|
|
|
// c.Set("baz", "yes", -1)
|
|
|
|
//
|
|
|
|
//
|
|
|
|
// // Get the string associated with the key "foo" from the cache
|
|
|
|
// // Get the string associated with the key "foo" from the cache
|
|
|
@ -35,17 +29,18 @@ import (
|
|
|
|
// fmt.Println(foo)
|
|
|
|
// fmt.Println(foo)
|
|
|
|
// }
|
|
|
|
// }
|
|
|
|
//
|
|
|
|
//
|
|
|
|
// // Since Go is statically typed, and cache values can be anything, type assertion
|
|
|
|
// // Since Go is statically typed, and cache values can be anything, type
|
|
|
|
// // is needed when values are being passed to functions that don't take arbitrary types,
|
|
|
|
// // assertion is needed when values are being passed to functions that don't
|
|
|
|
// // (i.e. interface{}). The simplest way to do this for values which will only be used
|
|
|
|
// // take arbitrary types, (i.e. interface{}). The simplest way to do this for
|
|
|
|
// // once--e.g. for passing to another function--is:
|
|
|
|
// // values which will only be used once--e.g. for passing to another
|
|
|
|
|
|
|
|
// // function--is:
|
|
|
|
// foo, found := c.Get("foo")
|
|
|
|
// foo, found := c.Get("foo")
|
|
|
|
// if found {
|
|
|
|
// if found {
|
|
|
|
// MyFunction(foo.(string))
|
|
|
|
// MyFunction(foo.(string))
|
|
|
|
// }
|
|
|
|
// }
|
|
|
|
//
|
|
|
|
//
|
|
|
|
// // This gets tedious if the value is used several times in the same function. You
|
|
|
|
// // This gets tedious if the value is used several times in the same function.
|
|
|
|
// // might do either of the following instead:
|
|
|
|
// // You might do either of the following instead:
|
|
|
|
// if x, found := c.Get("foo"); found {
|
|
|
|
// if x, found := c.Get("foo"); found {
|
|
|
|
// foo := x.(string)
|
|
|
|
// foo := x.(string)
|
|
|
|
// ...
|
|
|
|
// ...
|
|
|
@ -65,11 +60,11 @@ import (
|
|
|
|
// ...
|
|
|
|
// ...
|
|
|
|
// }
|
|
|
|
// }
|
|
|
|
//
|
|
|
|
//
|
|
|
|
// If you store a reference type like a pointer, slice, map or channel, you do not need to
|
|
|
|
// // If you store a reference type like a pointer, slice, map or channel, you
|
|
|
|
// run Set if you modify the underlying data. The cache does not serialize its data, so if
|
|
|
|
// // do not need to run Set if you modify the underlying data. The cache does
|
|
|
|
// you modify a struct whose pointer you've stored in the cache, retrieving that pointer
|
|
|
|
// // not serialize its data, so if you modify a struct whose pointer you've
|
|
|
|
// with Get will point you to the same data:
|
|
|
|
// // stored in the cache, retrieving that pointer with Get will point you to
|
|
|
|
//
|
|
|
|
// // the same data:
|
|
|
|
// foo := &MyStruct{Num: 1}
|
|
|
|
// foo := &MyStruct{Num: 1}
|
|
|
|
// c.Set("foo", foo, 0)
|
|
|
|
// c.Set("foo", foo, 0)
|
|
|
|
// ...
|
|
|
|
// ...
|
|
|
@ -83,10 +78,18 @@ import (
|
|
|
|
// foo := x.(*MyStruct)
|
|
|
|
// foo := x.(*MyStruct)
|
|
|
|
// foo.Println(foo.Num)
|
|
|
|
// foo.Println(foo.Num)
|
|
|
|
//
|
|
|
|
//
|
|
|
|
// will print:
|
|
|
|
// // will print:
|
|
|
|
// 1
|
|
|
|
// 1
|
|
|
|
// 2
|
|
|
|
// 2
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
import (
|
|
|
|
|
|
|
|
"fmt"
|
|
|
|
|
|
|
|
"reflect"
|
|
|
|
|
|
|
|
"runtime"
|
|
|
|
|
|
|
|
"sync"
|
|
|
|
|
|
|
|
"time"
|
|
|
|
|
|
|
|
)
|
|
|
|
|
|
|
|
|
|
|
|
type Cache struct {
|
|
|
|
type Cache struct {
|
|
|
|
*cache
|
|
|
|
*cache
|
|
|
|
// If this is confusing, see the comment at the bottom of the New() function
|
|
|
|
// If this is confusing, see the comment at the bottom of the New() function
|
|
|
|