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Patrick Mylund Nielsen 2012-01-15 12:00:21 -06:00
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README
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@ -1,22 +1,24 @@
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.
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
Usage:
== 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
// 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 "yes", with no expiration time (the item
// won't be removed until it is re-set, or removed using c.Delete("baz")
// Set the value of the key "baz" to "yes", with no expiration time
// (the item won't be removed until it is re-set, or removed using
// c.Delete("baz")
c.Set("baz", "yes", -1)
// Get the string associated with the key "foo" from the cache
@ -25,17 +27,18 @@ Usage:
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:
// 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:
// 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)
...
@ -55,10 +58,11 @@ Usage:
...
}
// 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 cache does not serialize its data, 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:
// 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 cache does
// not serialize its data, 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)
...
@ -76,54 +80,58 @@ Usage:
1
2
Reference:
== Reference
func New(de, ci time.Duration) *Cache
Returns a new cache with a given default expiration duration and default cleanup
interval. If the expiration duration is less than 1, the items in the cache never
expire and must be deleted manually. If the cleanup interval is less than one,
expired items are not deleted from the cache before their next lookup or before
calling DeleteExpired.
func New(de, ci time.Duration) *Cache
Returns a new cache with a given default expiration duration and default
cleanup interval. If the expiration duration is less than 1, the items in
the cache never expire and must be deleted manually. If the cleanup interval
is less than one, expired items are not deleted from the cache before their
next lookup or before calling DeleteExpired.
func (c *Cache) Set(k string, x interface{}, d time.Duration)
Adds an item to the cache, replacing any existing item. If the duration is 0, the
cache's default expiration time is used. If it is -1, the item never expires.
func (c *Cache) Set(k string, x interface{}, d time.Duration)
Adds an item to the cache, replacing any existing item. If the duration is 0,
the cache's default expiration time is used. If it is -1, the item never
expires.
func (c *Cache) Add(k string, x interface{}, d time.Duration) error
Adds an item to the cache only if an item doesn't already exist for the given key,
or if the existing item has expired. Returns an error if not.
func (c *Cache) Add(k string, x interface{}, d time.Duration) error
Adds an item to the cache only if an item doesn't already exist for the given
key, or if the existing item has expired. Returns an error if not.
func (c *Cache) Replace(k string, x interface{}, d time.Duration) error
Sets a new value for the cache item only if it already exists. Returns an error if
it does not.
func (c *Cache) Replace(k string, x interface{}, d time.Duration) error
Sets a new value for the cache item only if it already exists. Returns an
error if it does not.
func (c *Cache) Get(k string) (interface{}, bool)
Gets an item from the cache. Returns the item or nil, and a bool indicating whether
the given key was found in the cache.
func (c *Cache) Get(k string) (interface{}, bool)
Gets an item from the cache. Returns the item or nil, and a bool indicating
whether the given key was found in the cache.
func (c *Cache) Increment(k string, n int64) error
Increment an item of type int, int8, int16, int32, int64, uintptr, uint, uint8,
uint32, or uint64, float32 or float64 by n. Returns an error if the item's value
is not an integer, if it was not found, or if it is not possible to increment it
by n. Passing a negative number will cause the item to be decremented.
func (c *Cache) Increment(k string, n int64) error
Increment an item of type int, int8, int16, int32, int64, uintptr, uint,
uint8, uint32, or uint64, float32 or float64 by n. Returns an error if the
item's value is not an integer, if it was not found, or if it is not possible
to increment it by n. Passing a negative number will cause the item to be
decremented.
func (c *Cache) IncrementFloat(k string, n float64) error
Increment an item of type int, int8, int16, int32, int64, uintptr, uint, uint8,
uint32, uint64, float32 or float64 by n. Returns an error if the item's value is
not an integer, if it was not found, or if it is not possible to increment it by
n. Passing a negative number will cause the item to be decremented.
func (c *Cache) IncrementFloat(k string, n float64) error
Increment an item of type int, int8, int16, int32, int64, uintptr, uint,
uint8, uint32, or uint64, float32 or float64 by n. Returns an error if the
item's value is not an integer, if it was not found, or if it is not possible
to increment it by n. Passing a negative number will cause the item to be
decremented.
func (c *Cache) Decrement(k string, n int64) error
Decrement an item of type int, int8, int16, int32, int64, uintptr, uint, uint8,
uint32, or uint64, float32 or float64 by n. Returns an error if the item's value
is not an integer, if it was not found, or if it is not possible to decrement it
by n.
func (c *Cache) Decrement(k string, n int64) error
Decrement an item of type int, int8, int16, int32, int64, uintptr, uint,
uint8, uint32, or uint64, float32 or float64 by n. Returns an error if the
item's value is not an integer, if it was not found, or if it is not possible
to decrement it by n.
func (c *Cache) Delete(k string)
Deletes an item from the cache. Does nothing if the item does not exist in the cache.
func (c *Cache) Delete(k string)
Deletes an item from the cache. Does nothing if the item does not exist in
the cache.
func (c *Cache) DeleteExpired()
Deletes all expired items from the cache.
func (c *Cache) DeleteExpired()
Deletes all expired items from the cache.
func (c *Cache) Flush()
Deletes all items from the cache.
func (c *Cache) Flush()
Deletes all items from the cache.