cache

Documentation

Overview

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Package cache

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Index

• type Cache
  • func New(defaultExpiration, cleanupInterval time.Duration) *Cache
  • func NewFrom(defaultExpiration, cleanupInterval time.Duration, items map[string]Item) *Cache
  • func (c Cache) Add(k string, x interface{}, d time.Duration) error
  • func (c Cache) Delete(k string)
  • func (c Cache) DeleteExpired()
  • func (c Cache) Flush()
  • func (c Cache) Get(k string) (interface{}, bool)
  • func (c Cache) GetWithExpiration(k string) (interface{}, time.Time, bool)
  • func (c Cache) ItemCount() int
  • func (c Cache) Items() map[string]Item
  • func (c Cache) Load(r io.Reader) error
  • func (c Cache) LoadFile(fname string) error
  • func (c Cache) OnEvicted(f func(string, interface{}))
  • func (c Cache) Replace(k string, x interface{}, d time.Duration) error
  • func (c Cache) Save(w io.Writer) (err error)
  • func (c Cache) SaveFile(fname string) error
  • func (c Cache) Set(k string, x interface{}, d time.Duration)
  • func (c Cache) SetDefault(k string, x interface{})
• type Item
  • func (item Item) Expired() bool

Types

type Cache

type Cache struct {
	// contains filtered or unexported fields
}

func New

func New(defaultExpiration, cleanupInterval time.Duration) *Cache

func NewFrom

func NewFrom(defaultExpiration, cleanupInterval time.Duration, items map[string]Item) *Cache

func (Cache) Add

func (c Cache) Add(k string, x interface{}, d time.Duration) error

Add 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 otherwise.

func (Cache) Delete

func (c Cache) Delete(k string)

Delete an item from the cache. Does nothing if the key is not in the cache.

func (Cache) DeleteExpired

func (c Cache) DeleteExpired()

Delete all expired items from the cache.

func (Cache) Flush

func (c Cache) Flush()

Delete all items from the cache.

func (Cache) Get

func (c Cache) Get(k string) (interface{}, bool)

Get an item from the cache. Returns the item or nil, and a bool indicating whether the key was found.

func (Cache) GetWithExpiration

func (c Cache) GetWithExpiration(k string) (interface{}, time.Time, bool)

GetWithExpiration returns an item and its expiration time from the cache. It returns the item or nil, the expiration time if one is set (if the item never expires a zero value for time.Time is returned), and a bool indicating whether the key was found.

func (Cache) ItemCount

func (c Cache) ItemCount() int

Returns the number of items in the cache. This may include items that have expired, but have not yet been cleaned up.

func (Cache) Items

func (c Cache) Items() map[string]Item

Copies all unexpired items in the cache into a new map and returns it.

func (Cache) Load

func (c Cache) Load(r io.Reader) error

Add (Gob-serialized) cache items from an io.Reader, excluding any items with keys that already exist (and haven't expired) in the current cache.

NOTE: This method is deprecated in favor of c.Items() and NewFrom() (see the documentation for NewFrom().)

func (Cache) LoadFile

func (c Cache) LoadFile(fname string) error

Load and add cache items from the given filename, excluding any items with keys that already exist in the current cache.

NOTE: This method is deprecated in favor of c.Items() and NewFrom() (see the documentation for NewFrom().)

func (Cache) OnEvicted

func (c Cache) OnEvicted(f func(string, interface{}))

Sets an (optional) function that is called with the key and value when an item is evicted from the cache. (Including when it is deleted manually, but not when it is overwritten.) Set to nil to disable.

func (Cache) Replace

func (c Cache) Replace(k string, x interface{}, d time.Duration) error

Set a new value for the cache key only if it already exists, and the existing item hasn't expired. Returns an error otherwise.

func (Cache) Save

func (c Cache) Save(w io.Writer) (err error)

Write the cache's items (using Gob) to an io.Writer.

NOTE: This method is deprecated in favor of c.Items() and NewFrom() (see the documentation for NewFrom().)

func (Cache) SaveFile

func (c Cache) SaveFile(fname string) error

Save the cache's items to the given filename, creating the file if it doesn't exist, and overwriting it if it does.

NOTE: This method is deprecated in favor of c.Items() and NewFrom() (see the documentation for NewFrom().)

func (Cache) Set

func (c Cache) Set(k string, x interface{}, d time.Duration)

func (Cache) SetDefault

func (c Cache) SetDefault(k string, x interface{})

Add an item to the cache, replacing any existing item, using the default expiration.

type Item

type Item struct {
	Object     interface{}
	Expiration int64
}

func (Item) Expired

func (item Item) Expired() bool

Returns true if the item has expired.