memory

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 Go to latest Published: Oct 31, 2024 License: GPL-3.0 Imports: 11 Imported by: 12

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memory

Fork From https://github.com/patrickmn/go-cache use go mod

Documentation

Index

Constants

View Source 
const (
	// NoExpiration For use with functions that take an expiration time.
	NoExpiration time.Duration = -1
	// DefaultExpiration For use with functions that take an expiration time. Equivalent to
	// passing in the same expiration duration as was given to New() or
	// NewFrom() when the cache was created (e.g. 5 minutes.)
	DefaultExpiration time.Duration = 0
)

Variables

This section is empty.

Functions

This section is empty.

Types

type Cache 

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

func New 

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

New Return a new cache with a given default expiration duration and cleanup interval. If the expiration duration is less than one (or NoExpiration), the items in the cache never expire (by default), and must be deleted manually. If the cleanup interval is less than one, expired items are not deleted from the cache before calling c.DeleteExpired().

func NewFrom 

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

NewFrom Return a new cache with a given default expiration duration and cleanup interval. If the expiration duration is less than one (or NoExpiration), the items in the cache never expire (by default), and must be deleted manually. If the cleanup interval is less than one, expired items are not deleted from the cache before calling c.DeleteExpired().

NewFrom() also accepts an items map which will serve as the underlying map for the cache. This is useful for starting from a deserialized cache (serialized using e.g. gob.Encode() on c.Items()), or passing in e.g. make(map[string]Item, 500) to improve startup performance when the cache is expected to reach a certain minimum size.

Only the cache's methods synchronize access to this map, so it is not recommended to keep any references to the map around after creating a cache. If need be, the map can be accessed at a later point using c.Items() (subject to the same caveat.)

Note regarding serialization: When using e.g. gob, make sure to gob.Register() the individual types stored in the cache before encoding a map retrieved with c.Items(), and to register those same types before decoding a blob containing an items map.

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) Decrement 

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. To retrieve the decremented value, use one of the specialized methods, e.g. DecrementInt64.

func (Cache) DecrementFloat 

func (c Cache) DecrementFloat(k string, n float64) error

DecrementFloat Decrement an item of type float32 or float64 by n. Returns an error if the item's value is not floating point, if it was not found, or if it is not possible to decrement it by n. Pass a negative number to decrement the value. To retrieve the decremented value, use one of the specialized methods, e.g. DecrementFloat64.

func (Cache) DecrementFloat32 

func (c Cache) DecrementFloat32(k string, n float32) (float32, error)

DecrementFloat32 Decrement an item of type float32 by n. Returns an error if the item's value is not an float32, or if it was not found. If there is no error, the decremented value is returned.

func (Cache) DecrementFloat64 

func (c Cache) DecrementFloat64(k string, n float64) (float64, error)

DecrementFloat64 Decrement an item of type float64 by n. Returns an error if the item's value is not an float64, or if it was not found. If there is no error, the decremented value is returned.

func (Cache) DecrementInt 

func (c Cache) DecrementInt(k string, n int) (int, error)

DecrementInt Decrement an item of type int by n. Returns an error if the item's value is not an int, or if it was not found. If there is no error, the decremented value is returned.

func (Cache) DecrementInt16 

func (c Cache) DecrementInt16(k string, n int16) (int16, error)

DecrementInt16 Decrement an item of type int16 by n. Returns an error if the item's value is not an int16, or if it was not found. If there is no error, the decremented value is returned.

func (Cache) DecrementInt32 

func (c Cache) DecrementInt32(k string, n int32) (int32, error)

DecrementInt32 Decrement an item of type int32 by n. Returns an error if the item's value is not an int32, or if it was not found. If there is no error, the decremented value is returned.

func (Cache) DecrementInt64 

func (c Cache) DecrementInt64(k string, n int64) (int64, error)

DecrementInt64 Decrement an item of type int64 by n. Returns an error if the item's value is not an int64, or if it was not found. If there is no error, the decremented value is returned.

func (Cache) DecrementInt8 

func (c Cache) DecrementInt8(k string, n int8) (int8, error)

DecrementInt8 Decrement an item of type int8 by n. Returns an error if the item's value is not an int8, or if it was not found. If there is no error, the decremented value is returned.

func (Cache) DecrementUint 

func (c Cache) DecrementUint(k string, n uint) (uint, error)

DecrementUint Decrement an item of type uint by n. Returns an error if the item's value is not an uint, or if it was not found. If there is no error, the decremented value is returned.

func (Cache) DecrementUint16 

func (c Cache) DecrementUint16(k string, n uint16) (uint16, error)

DecrementUint16 Decrement an item of type uint16 by n. Returns an error if the item's value is not an uint16, or if it was not found. If there is no error, the decremented value is returned.

func (Cache) DecrementUint32 

func (c Cache) DecrementUint32(k string, n uint32) (uint32, error)

DecrementUint32 Decrement an item of type uint32 by n. Returns an error if the item's value is not an uint32, or if it was not found. If there is no error, the decremented value is returned.

func (Cache) DecrementUint64 

func (c Cache) DecrementUint64(k string, n uint64) (uint64, error)

DecrementUint64 Decrement an item of type uint64 by n. Returns an error if the item's value is not an uint64, or if it was not found. If there is no error, the decremented value is returned.

func (Cache) DecrementUint8 

func (c Cache) DecrementUint8(k string, n uint8) (uint8, error)

DecrementUint8 Decrement an item of type uint8 by n. Returns an error if the item's value is not an uint8, or if it was not found. If there is no error, the decremented value is returned.

func (Cache) DecrementUintptr 

func (c Cache) DecrementUintptr(k string, n uintptr) (uintptr, error)

DecrementUintptr Decrement an item of type uintptr by n. Returns an error if the item's value is not an uintptr, or if it was not found. If there is no error, the decremented value is returned.

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()

DeleteExpired Delete all expired items from the cache.

func (Cache) Flush 

func (c Cache) Flush()

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) Increment 

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. To retrieve the incremented value, use one of the specialized methods, e.g. IncrementInt64.

func (Cache) IncrementFloat 

func (c Cache) IncrementFloat(k string, n float64) error

IncrementFloat Increment an item of type float32 or float64 by n. Returns an error if the item's value is not floating point, if it was not found, or if it is not possible to increment it by n. Pass a negative number to decrement the value. To retrieve the incremented value, use one of the specialized methods, e.g. IncrementFloat64.

func (Cache) IncrementFloat32 

func (c Cache) IncrementFloat32(k string, n float32) (float32, error)

IncrementFloat32 Increment an item of type float32 by n. Returns an error if the item's value is not an float32, or if it was not found. If there is no error, the incremented value is returned.

func (Cache) IncrementFloat64 

func (c Cache) IncrementFloat64(k string, n float64) (float64, error)

IncrementFloat64 Increment an item of type float64 by n. Returns an error if the item's value is not an float64, or if it was not found. If there is no error, the incremented value is returned.

func (Cache) IncrementInt 

func (c Cache) IncrementInt(k string, n int) (int, error)

IncrementInt Increment an item of type int by n. Returns an error if the item's value is not an int, or if it was not found. If there is no error, the incremented value is returned.

func (Cache) IncrementInt16 

func (c Cache) IncrementInt16(k string, n int16) (int16, error)

IncrementInt16 Increment an item of type int16 by n. Returns an error if the item's value is not an int16, or if it was not found. If there is no error, the incremented value is returned.

func (Cache) IncrementInt32 

func (c Cache) IncrementInt32(k string, n int32) (int32, error)

IncrementInt32 Increment an item of type int32 by n. Returns an error if the item's value is not an int32, or if it was not found. If there is no error, the incremented value is returned.

func (Cache) IncrementInt64 

func (c Cache) IncrementInt64(k string, n int64) (int64, error)

IncrementInt64 Increment an item of type int64 by n. Returns an error if the item's value is not an int64, or if it was not found. If there is no error, the incremented value is returned.

func (Cache) IncrementInt8 

func (c Cache) IncrementInt8(k string, n int8) (int8, error)

IncrementInt8 Increment an item of type int8 by n. Returns an error if the item's value is not an int8, or if it was not found. If there is no error, the incremented value is returned.

func (Cache) IncrementUint 

func (c Cache) IncrementUint(k string, n uint) (uint, error)

IncrementUint Increment an item of type uint by n. Returns an error if the item's value is not an uint, or if it was not found. If there is no error, the incremented value is returned.

func (Cache) IncrementUint16 

func (c Cache) IncrementUint16(k string, n uint16) (uint16, error)

IncrementUint16 Increment an item of type uint16 by n. Returns an error if the item's value is not an uint16, or if it was not found. If there is no error, the incremented value is returned.

func (Cache) IncrementUint32 

func (c Cache) IncrementUint32(k string, n uint32) (uint32, error)

IncrementUint32 Increment an item of type uint32 by n. Returns an error if the item's value is not an uint32, or if it was not found. If there is no error, the incremented value is returned.

func (Cache) IncrementUint64 

func (c Cache) IncrementUint64(k string, n uint64) (uint64, error)

IncrementUint64 Increment an item of type uint64 by n. Returns an error if the item's value is not an uint64, or if it was not found. If there is no error, the incremented value is returned.

func (Cache) IncrementUint8 

func (c Cache) IncrementUint8(k string, n uint8) (uint8, error)

IncrementUint8 Increment an item of type uint8 by n. Returns an error if the item's value is not an uint8, or if it was not found. If there is no error, the incremented value is returned.

func (Cache) IncrementUintptr 

func (c Cache) IncrementUintptr(k string, n uintptr) (uintptr, error)

IncrementUintptr Increment an item of type uintptr by n. Returns an error if the item's value is not an uintptr, or if it was not found. If there is no error, the incremented value is returned.

func (Cache) ItemCount 

func (c Cache) ItemCount() int

ItemCount 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

Items 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

Load 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

LoadFile 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{}))

OnEvicted 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

Replace 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)

Save 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

SaveFile 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)

Set Add an item to the cache, replacing any existing item. If the duration is 0 (DefaultExpiration), the cache's default expiration time is used. If it is -1 (NoExpiration), the item never expires.

func (Cache) SetDefault 

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

SetDefault 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.

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