New markdown README (thanks Jason Mooberry)
This commit is contained in:
Patrick Mylund Nielsen
parent
46827c6a61
commit
238c0209c0
94
README
94
README
@ -1,94 +0,0 @@
|
||||
go-cache is an in-memory key:value store/cache similar to memcached that is
|
||||
suitable for applications running on a single machine. Its major advantage is
|
||||
that, being essentially a thread-safe map[string]interface{} with expiration
|
||||
times, it doesn't need to serialize or transmit its contents over the network.
|
||||
|
||||
Any object can be stored, for a given duration or forever, and the cache can be
|
||||
safely used by multiple goroutines.
|
||||
|
||||
Although go-cache isn't meant to be used as a persistent datastore, the entire
|
||||
cache may be saved to and loaded from a file (or any io.Reader/Writer) to
|
||||
recover from downtime quickly.
|
||||
|
||||
== Installation
|
||||
|
||||
go get github.com/pmylund/go-cache
|
||||
|
||||
== Usage
|
||||
|
||||
import "github.com/pmylund/go-cache"
|
||||
|
||||
// Create a cache with a default expiration time of 5 minutes, and which
|
||||
// purges expired items every 30 seconds
|
||||
c := cache.New(5*time.Minute, 30*time.Second)
|
||||
|
||||
// Set the value of the key "foo" to "bar", with the default expiration time
|
||||
c.Set("foo", "bar", 0)
|
||||
|
||||
// Set the value of the key "baz" to 42, with no expiration time
|
||||
// (the item won't be removed until it is re-set, or removed using
|
||||
// c.Delete("baz")
|
||||
c.Set("baz", 42, -1)
|
||||
|
||||
// Get the string associated with the key "foo" from the cache
|
||||
foo, found := c.Get("foo")
|
||||
if found {
|
||||
fmt.Println(foo)
|
||||
}
|
||||
|
||||
// Since Go is statically typed, and cache values can be anything, type
|
||||
// assertion is needed when values are being passed to functions that don't
|
||||
// take arbitrary types, (i.e. interface{}). The simplest way to do this for
|
||||
// values which will only be used once--e.g. for passing to another
|
||||
// function--is:
|
||||
foo, found := c.Get("foo")
|
||||
if found {
|
||||
MyFunction(foo.(string))
|
||||
}
|
||||
|
||||
// This gets tedious if the value is used several times in the same function.
|
||||
// You might do either of the following instead:
|
||||
if x, found := c.Get("foo"); found {
|
||||
foo := x.(string)
|
||||
...
|
||||
}
|
||||
// or
|
||||
var foo string
|
||||
if x, found := c.Get("foo"); found {
|
||||
foo = x.(string)
|
||||
}
|
||||
...
|
||||
// foo can then be passed around freely as a string
|
||||
|
||||
// Want performance? Store pointers!
|
||||
c.Set("foo", &MyStruct, 0)
|
||||
if x, found := c.Get("foo"); found {
|
||||
foo := x.(*MyStruct)
|
||||
...
|
||||
}
|
||||
|
||||
// If you store a reference type like a pointer, slice, map or channel, you
|
||||
// do not need to run Set if you modify the underlying data. The cached
|
||||
// reference points to the same memory, so if you modify a struct whose
|
||||
// pointer you've stored in the cache, retrieving that pointer with Get will
|
||||
// point you to the same data:
|
||||
foo := &MyStruct{Num: 1}
|
||||
c.Set("foo", foo, 0)
|
||||
...
|
||||
x, _ := c.Get("foo")
|
||||
foo := x.(*MyStruct)
|
||||
fmt.Println(foo.Num)
|
||||
...
|
||||
foo.Num++
|
||||
...
|
||||
x, _ := c.Get("foo")
|
||||
foo := x.(*MyStruct)
|
||||
foo.Println(foo.Num)
|
||||
|
||||
// will print:
|
||||
1
|
||||
2
|
||||
|
||||
== Reference
|
||||
|
||||
`go doc` or http://godoc.org/github.com/pmylund/go-cache
|
||||
105
README.md
Normal file
105
README.md
Normal file
@ -0,0 +1,105 @@
|
||||
# go-cache
|
||||
|
||||
go-cache is an in-memory key:value store/cache similar to memcached that is
|
||||
suitable for applications running on a single machine. Its major advantage is
|
||||
that, being essentially a thread-safe `map[string]interface{}` with expiration
|
||||
times, it doesn't need to serialize or transmit its contents over the network.
|
||||
|
||||
Any object can be stored, for a given duration or forever, and the cache can be
|
||||
safely used by multiple goroutines.
|
||||
|
||||
Although go-cache isn't meant to be used as a persistent datastore, the entire
|
||||
cache can be saved to and loaded from a file (using `c.Items()` to retrieve the
|
||||
items map to serialize, and `NewFrom()` to create a cache from a deserialized
|
||||
one) to recover from downtime quickly. (See the docs for `NewFrom` for caveats.)
|
||||
|
||||
### Installation
|
||||
|
||||
`go get github.com/pmylund/go-cache`
|
||||
|
||||
### Usage
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"github.com/pmylund/go-cache"
|
||||
)
|
||||
|
||||
func main() {
|
||||
|
||||
// Create a cache with a default expiration time of 5 minutes, and which
|
||||
// purges expired items every 30 seconds
|
||||
c := cache.New(5*time.Minute, 30*time.Second)
|
||||
|
||||
// Set the value of the key "foo" to "bar", with the default expiration time
|
||||
c.Set("foo", "bar", cache.DefaultExpiration)
|
||||
|
||||
// Set the value of the key "baz" to 42, with no expiration time
|
||||
// (the item won't be removed until it is re-set, or removed using
|
||||
// c.Delete("baz")
|
||||
c.Set("baz", 42, cache.NoExpiration)
|
||||
|
||||
// Get the string associated with the key "foo" from the cache
|
||||
foo, found := c.Get("foo")
|
||||
if found {
|
||||
fmt.Println(foo)
|
||||
}
|
||||
|
||||
// Since Go is statically typed, and cache values can be anything, type
|
||||
// assertion is needed when values are being passed to functions that don't
|
||||
// take arbitrary types, (i.e. interface{}). The simplest way to do this for
|
||||
// values which will only be used once--e.g. for passing to another
|
||||
// function--is:
|
||||
foo, found := c.Get("foo")
|
||||
if found {
|
||||
MyFunction(foo.(string))
|
||||
}
|
||||
|
||||
// This gets tedious if the value is used several times in the same function.
|
||||
// You might do either of the following instead:
|
||||
if x, found := c.Get("foo"); found {
|
||||
foo := x.(string)
|
||||
// ...
|
||||
}
|
||||
// or
|
||||
var foo string
|
||||
if x, found := c.Get("foo"); found {
|
||||
foo = x.(string)
|
||||
}
|
||||
// ...
|
||||
// foo can then be passed around freely as a string
|
||||
|
||||
// Want performance? Store pointers!
|
||||
c.Set("foo", &MyStruct, cache.DefaultExpiration)
|
||||
if x, found := c.Get("foo"); found {
|
||||
foo := x.(*MyStruct)
|
||||
// ...
|
||||
}
|
||||
|
||||
// If you store a reference type like a pointer, slice, map or channel, you
|
||||
// do not need to run Set if you modify the underlying data. The cached
|
||||
// reference points to the same memory, so if you modify a struct whose
|
||||
// pointer you've stored in the cache, retrieving that pointer with Get will
|
||||
// point you to the same data:
|
||||
foo := &MyStruct{Num: 1}
|
||||
c.Set("foo", foo, cache.DefaultExpiration)
|
||||
// ...
|
||||
x, _ := c.Get("foo")
|
||||
foo := x.(*MyStruct)
|
||||
fmt.Println(foo.Num)
|
||||
// ...
|
||||
foo.Num++
|
||||
// ...
|
||||
x, _ := c.Get("foo")
|
||||
foo := x.(*MyStruct)
|
||||
foo.Println(foo.Num)
|
||||
|
||||
// will print:
|
||||
// 1
|
||||
// 2
|
||||
|
||||
}
|
||||
|
||||
|
||||
### Reference
|
||||
|
||||
`godoc` or [http://godoc.org/github.com/pmylund/go-cache](http://godoc.org/github.com/pmylund/go-cache)
|
||||
Loading…
Reference in New Issue
Block a user