gcache

package
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 Go to latest Published: Oct 22, 2021 License: MIT Imports: 12 Imported by: 232

Documentation

Overview

Package gcache provides kinds of cache management for process.

It provides a concurrent-safe in-memory cache adapter for process in default.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func Contains 

func Contains(ctx context.Context, key interface{}) (bool, error)

Contains checks and returns true if `key` exists in the cache, or else returns false.

func Data 

func Data(ctx context.Context) (map[interface{}]interface{}, error)

Data returns a copy of all key-value pairs in the cache as map type. Note that this function may lead lots of memory usage, you can implement this function if necessary.

func Get 

func Get(ctx context.Context, key interface{}) (*gvar.Var, error)

Get retrieves and returns the associated value of given `key`. It returns nil if it does not exist, or its value is nil, or it's expired. If you would like to check if the `key` exists in the cache, it's better using function Contains.

func GetExpire 

func GetExpire(ctx context.Context, key interface{}) (time.Duration, error)

GetExpire retrieves and returns the expiration of `key` in the cache.

Note that, It returns 0 if the `key` does not expire. It returns -1 if the `key` does not exist in the cache.

func GetOrSet 

func GetOrSet(ctx context.Context, key interface{}, value interface{}, duration time.Duration) (*gvar.Var, error)

GetOrSet retrieves and returns the value of `key`, or sets `key`-`value` pair and returns `value` if `key` does not exist in the cache. The key-value pair expires after `duration`.

It does not expire if `duration` == 0. It deletes the `key` if `duration` < 0 or given `value` is nil, but it does nothing if `value` is a function and the function result is nil.

func GetOrSetFunc 

func GetOrSetFunc(ctx context.Context, key interface{}, f func() (interface{}, error), duration time.Duration) (*gvar.Var, error)

GetOrSetFunc retrieves and returns the value of `key`, or sets `key` with result of function `f` and returns its result if `key` does not exist in the cache. The key-value pair expires after `duration`.

It does not expire if `duration` == 0. It deletes the `key` if `duration` < 0 or given `value` is nil, but it does nothing if `value` is a function and the function result is nil.

func GetOrSetFuncLock 

func GetOrSetFuncLock(ctx context.Context, key interface{}, f func() (interface{}, error), duration time.Duration) (*gvar.Var, error)

GetOrSetFuncLock retrieves and returns the value of `key`, or sets `key` with result of function `f` and returns its result if `key` does not exist in the cache. The key-value pair expires after `duration`.

It does not expire if `duration` == 0. It deletes the `key` if `duration` < 0 or given `value` is nil, but it does nothing if `value` is a function and the function result is nil.

Note that it differs from function `GetOrSetFunc` is that the function `f` is executed within writing mutex lock for concurrent safety purpose.

func KeyStrings 

func KeyStrings(ctx context.Context) ([]string, error)

KeyStrings returns all keys in the cache as string slice.

func Keys 

func Keys(ctx context.Context) ([]interface{}, error)

Keys returns all keys in the cache as slice.

func MustContains 

func MustContains(ctx context.Context, key interface{}) bool

MustContains acts like Contains, but it panics if any error occurs.

func MustData 

func MustData(ctx context.Context) map[interface{}]interface{}

MustData acts like Data, but it panics if any error occurs.

func MustGet 

func MustGet(ctx context.Context, key interface{}) *gvar.Var

MustGet acts like Get, but it panics if any error occurs.

func MustGetExpire 

func MustGetExpire(ctx context.Context, key interface{}) time.Duration

MustGetExpire acts like GetExpire, but it panics if any error occurs.

func MustGetOrSet 

func MustGetOrSet(ctx context.Context, key interface{}, value interface{}, duration time.Duration) *gvar.Var

MustGetOrSet acts like GetOrSet, but it panics if any error occurs.

func MustGetOrSetFunc 

func MustGetOrSetFunc(ctx context.Context, key interface{}, f func() (interface{}, error), duration time.Duration) *gvar.Var

MustGetOrSetFunc acts like GetOrSetFunc, but it panics if any error occurs.

func MustGetOrSetFuncLock 

func MustGetOrSetFuncLock(ctx context.Context, key interface{}, f func() (interface{}, error), duration time.Duration) *gvar.Var

MustGetOrSetFuncLock acts like GetOrSetFuncLock, but it panics if any error occurs.

func MustKeyStrings 

func MustKeyStrings(ctx context.Context) []string

MustKeyStrings acts like KeyStrings, but it panics if any error occurs.

func MustKeys 

func MustKeys(ctx context.Context) []interface{}

MustKeys acts like Keys, but it panics if any error occurs.

func MustSize 

func MustSize(ctx context.Context) int

MustSize acts like Size, but it panics if any error occurs.

func MustValues 

func MustValues(ctx context.Context) []interface{}

MustValues acts like Values, but it panics if any error occurs.

func Remove 

func Remove(ctx context.Context, keys ...interface{}) (value *gvar.Var, err error)

Remove deletes one or more keys from cache, and returns its value. If multiple keys are given, it returns the value of the last deleted item.

func Removes 

func Removes(ctx context.Context, keys []interface{}) error

Removes deletes `keys` in the cache.

func Set 

func Set(ctx context.Context, key interface{}, value interface{}, duration time.Duration) error

Set sets cache with `key`-`value` pair, which is expired after `duration`.

It does not expire if `duration` == 0. It deletes the keys of `data` if `duration` < 0 or given `value` is nil.

func SetIfNotExist 

func SetIfNotExist(ctx context.Context, key interface{}, value interface{}, duration time.Duration) (bool, error)

SetIfNotExist sets cache with `key`-`value` pair which is expired after `duration` if `key` does not exist in the cache. It returns true the `key` does not exist in the cache, and it sets `value` successfully to the cache, or else it returns false.

It does not expire if `duration` == 0. It deletes the `key` if `duration` < 0 or given `value` is nil.

func SetIfNotExistFunc 

func SetIfNotExistFunc(ctx context.Context, key interface{}, f func() (interface{}, error), duration time.Duration) (bool, error)

SetIfNotExistFunc sets `key` with result of function `f` and returns true if `key` does not exist in the cache, or else it does nothing and returns false if `key` already exists.

The parameter `value` can be type of `func() interface{}`, but it does nothing if its result is nil.

It does not expire if `duration` == 0. It deletes the `key` if `duration` < 0 or given `value` is nil.

func SetIfNotExistFuncLock 

func SetIfNotExistFuncLock(ctx context.Context, key interface{}, f func() (interface{}, error), duration time.Duration) (bool, error)

SetIfNotExistFuncLock sets `key` with result of function `f` and returns true if `key` does not exist in the cache, or else it does nothing and returns false if `key` already exists.

It does not expire if `duration` == 0. It deletes the `key` if `duration` < 0 or given `value` is nil.

Note that it differs from function `SetIfNotExistFunc` is that the function `f` is executed within writing mutex lock for concurrent safety purpose.

func SetMap 

func SetMap(ctx context.Context, data map[interface{}]interface{}, duration time.Duration) error

SetMap batch sets cache with key-value pairs by `data` map, which is expired after `duration`.

It does not expire if `duration` == 0. It deletes the keys of `data` if `duration` < 0 or given `value` is nil.

func Size 

func Size(ctx context.Context) (int, error)

Size returns the number of items in the cache.

func Update 

func Update(ctx context.Context, key interface{}, value interface{}) (oldValue *gvar.Var, exist bool, err error)

Update updates the value of `key` without changing its expiration and returns the old value. The returned value `exist` is false if the `key` does not exist in the cache.

It deletes the `key` if given `value` is nil. It does nothing if `key` does not exist in the cache.

func UpdateExpire 

func UpdateExpire(ctx context.Context, key interface{}, duration time.Duration) (oldDuration time.Duration, err error)

UpdateExpire updates the expiration of `key` and returns the old expiration duration value.

It returns -1 and does nothing if the `key` does not exist in the cache. It deletes the `key` if `duration` < 0.

func Values 

func Values(ctx context.Context) ([]interface{}, error)

Values returns all values in the cache as slice.

Types

type Adapter 

type Adapter interface {
	// Set sets cache with `key`-`value` pair, which is expired after `duration`.
	//
	// It does not expire if `duration` == 0.
	// It deletes the keys of `data` if `duration` < 0 or given `value` is nil.
	Set(ctx context.Context, key interface{}, value interface{}, duration time.Duration) error

	// SetMap batch sets cache with key-value pairs by `data` map, which is expired after `duration`.
	//
	// It does not expire if `duration` == 0.
	// It deletes the keys of `data` if `duration` < 0 or given `value` is nil.
	SetMap(ctx context.Context, data map[interface{}]interface{}, duration time.Duration) error

	// SetIfNotExist sets cache with `key`-`value` pair which is expired after `duration`
	// if `key` does not exist in the cache. It returns true the `key` does not exist in the
	// cache, and it sets `value` successfully to the cache, or else it returns false.
	//
	// It does not expire if `duration` == 0.
	// It deletes the `key` if `duration` < 0 or given `value` is nil.
	SetIfNotExist(ctx context.Context, key interface{}, value interface{}, duration time.Duration) (ok bool, err error)

	// SetIfNotExistFunc sets `key` with result of function `f` and returns true
	// if `key` does not exist in the cache, or else it does nothing and returns false if `key` already exists.
	//
	// The parameter `value` can be type of `func() interface{}`, but it does nothing if its
	// result is nil.
	//
	// It does not expire if `duration` == 0.
	// It deletes the `key` if `duration` < 0 or given `value` is nil.
	SetIfNotExistFunc(ctx context.Context, key interface{}, f func() (interface{}, error), duration time.Duration) (ok bool, err error)

	// SetIfNotExistFuncLock sets `key` with result of function `f` and returns true
	// if `key` does not exist in the cache, or else it does nothing and returns false if `key` already exists.
	//
	// It does not expire if `duration` == 0.
	// It deletes the `key` if `duration` < 0 or given `value` is nil.
	//
	// Note that it differs from function `SetIfNotExistFunc` is that the function `f` is executed within
	// writing mutex lock for concurrent safety purpose.
	SetIfNotExistFuncLock(ctx context.Context, key interface{}, f func() (interface{}, error), duration time.Duration) (ok bool, err error)

	// Get retrieves and returns the associated value of given `key`.
	// It returns nil if it does not exist, or its value is nil, or it's expired.
	// If you would like to check if the `key` exists in the cache, it's better using function Contains.
	Get(ctx context.Context, key interface{}) (*gvar.Var, error)

	// GetOrSet retrieves and returns the value of `key`, or sets `key`-`value` pair and
	// returns `value` if `key` does not exist in the cache. The key-value pair expires
	// after `duration`.
	//
	// It does not expire if `duration` == 0.
	// It deletes the `key` if `duration` < 0 or given `value` is nil, but it does nothing
	// if `value` is a function and the function result is nil.
	GetOrSet(ctx context.Context, key interface{}, value interface{}, duration time.Duration) (result *gvar.Var, err error)

	// GetOrSetFunc retrieves and returns the value of `key`, or sets `key` with result of
	// function `f` and returns its result if `key` does not exist in the cache. The key-value
	// pair expires after `duration`.
	//
	// It does not expire if `duration` == 0.
	// It deletes the `key` if `duration` < 0 or given `value` is nil, but it does nothing
	// if `value` is a function and the function result is nil.
	GetOrSetFunc(ctx context.Context, key interface{}, f func() (interface{}, error), duration time.Duration) (result *gvar.Var, err error)

	// GetOrSetFuncLock retrieves and returns the value of `key`, or sets `key` with result of
	// function `f` and returns its result if `key` does not exist in the cache. The key-value
	// pair expires after `duration`.
	//
	// It does not expire if `duration` == 0.
	// It deletes the `key` if `duration` < 0 or given `value` is nil, but it does nothing
	// if `value` is a function and the function result is nil.
	//
	// Note that it differs from function `GetOrSetFunc` is that the function `f` is executed within
	// writing mutex lock for concurrent safety purpose.
	GetOrSetFuncLock(ctx context.Context, key interface{}, f func() (interface{}, error), duration time.Duration) (result *gvar.Var, err error)

	// Contains checks and returns true if `key` exists in the cache, or else returns false.
	Contains(ctx context.Context, key interface{}) (bool, error)

	// Size returns the number of items in the cache.
	Size(ctx context.Context) (size int, err error)

	// Data returns a copy of all key-value pairs in the cache as map type.
	// Note that this function may lead lots of memory usage, you can implement this function
	// if necessary.
	Data(ctx context.Context) (data map[interface{}]interface{}, err error)

	// Keys returns all keys in the cache as slice.
	Keys(ctx context.Context) (keys []interface{}, err error)

	// Values returns all values in the cache as slice.
	Values(ctx context.Context) (values []interface{}, err error)

	// Update updates the value of `key` without changing its expiration and returns the old value.
	// The returned value `exist` is false if the `key` does not exist in the cache.
	//
	// It deletes the `key` if given `value` is nil.
	// It does nothing if `key` does not exist in the cache.
	Update(ctx context.Context, key interface{}, value interface{}) (oldValue *gvar.Var, exist bool, err error)

	// UpdateExpire updates the expiration of `key` and returns the old expiration duration value.
	//
	// It returns -1 and does nothing if the `key` does not exist in the cache.
	// It deletes the `key` if `duration` < 0.
	UpdateExpire(ctx context.Context, key interface{}, duration time.Duration) (oldDuration time.Duration, err error)

	// GetExpire retrieves and returns the expiration of `key` in the cache.
	//
	// Note that,
	// It returns 0 if the `key` does not expire.
	// It returns -1 if the `key` does not exist in the cache.
	GetExpire(ctx context.Context, key interface{}) (time.Duration, error)

	// Remove deletes one or more keys from cache, and returns its value.
	// If multiple keys are given, it returns the value of the last deleted item.
	Remove(ctx context.Context, keys ...interface{}) (lastValue *gvar.Var, err error)

	// Clear clears all data of the cache.
	// Note that this function is sensitive and should be carefully used.
	Clear(ctx context.Context) error

	// Close closes the cache if necessary.
	Close(ctx context.Context) error
}

Adapter is the core adapter for cache features implements.

Note that the implementer itself should guarantee the concurrent safety of these functions.

type AdapterMemory 

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

AdapterMemory is an adapter implements using memory.

func NewAdapterMemory 

func NewAdapterMemory(lruCap ...int) *AdapterMemory

NewAdapterMemory creates and returns a new memory cache object.

func (*AdapterMemory) Clear 

func (c *AdapterMemory) Clear(ctx context.Context) error

Clear clears all data of the cache. Note that this function is sensitive and should be carefully used.

func (*AdapterMemory) Close 

func (c *AdapterMemory) Close(ctx context.Context) error

Close closes the cache.

func (*AdapterMemory) Contains 

func (c *AdapterMemory) Contains(ctx context.Context, key interface{}) (bool, error)

Contains checks and returns true if `key` exists in the cache, or else returns false.

func (*AdapterMemory) Data 

func (c *AdapterMemory) Data(ctx context.Context) (map[interface{}]interface{}, error)

Data returns a copy of all key-value pairs in the cache as map type.

func (*AdapterMemory) Get 

func (c *AdapterMemory) Get(ctx context.Context, key interface{}) (*gvar.Var, error)

Get retrieves and returns the associated value of given `key`. It returns nil if it does not exist, or its value is nil, or it's expired. If you would like to check if the `key` exists in the cache, it's better using function Contains.

func (*AdapterMemory) GetExpire 

func (c *AdapterMemory) GetExpire(ctx context.Context, key interface{}) (time.Duration, error)

GetExpire retrieves and returns the expiration of `key` in the cache.

Note that, It returns 0 if the `key` does not expire. It returns -1 if the `key` does not exist in the cache.

func (*AdapterMemory) GetOrSet 

func (c *AdapterMemory) GetOrSet(ctx context.Context, key interface{}, value interface{}, duration time.Duration) (*gvar.Var, error)

GetOrSet retrieves and returns the value of `key`, or sets `key`-`value` pair and returns `value` if `key` does not exist in the cache. The key-value pair expires after `duration`.

It does not expire if `duration` == 0. It deletes the `key` if `duration` < 0 or given `value` is nil, but it does nothing if `value` is a function and the function result is nil.

func (*AdapterMemory) GetOrSetFunc 

func (c *AdapterMemory) GetOrSetFunc(ctx context.Context, key interface{}, f func() (interface{}, error), duration time.Duration) (*gvar.Var, error)

GetOrSetFunc retrieves and returns the value of `key`, or sets `key` with result of function `f` and returns its result if `key` does not exist in the cache. The key-value pair expires after `duration`.

It does not expire if `duration` == 0. It deletes the `key` if `duration` < 0 or given `value` is nil, but it does nothing if `value` is a function and the function result is nil.

func (*AdapterMemory) GetOrSetFuncLock 

func (c *AdapterMemory) GetOrSetFuncLock(ctx context.Context, key interface{}, f func() (interface{}, error), duration time.Duration) (*gvar.Var, error)

GetOrSetFuncLock retrieves and returns the value of `key`, or sets `key` with result of function `f` and returns its result if `key` does not exist in the cache. The key-value pair expires after `duration`.

It does not expire if `duration` == 0. It deletes the `key` if `duration` < 0 or given `value` is nil, but it does nothing if `value` is a function and the function result is nil.

Note that it differs from function `GetOrSetFunc` is that the function `f` is executed within writing mutex lock for concurrent safety purpose.

func (*AdapterMemory) Keys 

func (c *AdapterMemory) Keys(ctx context.Context) ([]interface{}, error)

Keys returns all keys in the cache as slice.

func (*AdapterMemory) Remove 

func (c *AdapterMemory) Remove(ctx context.Context, keys ...interface{}) (*gvar.Var, error)

Remove deletes one or more keys from cache, and returns its value. If multiple keys are given, it returns the value of the last deleted item.

func (*AdapterMemory) Set 

func (c *AdapterMemory) Set(ctx context.Context, key interface{}, value interface{}, duration time.Duration) error

Set sets cache with `key`-`value` pair, which is expired after `duration`.

It does not expire if `duration` == 0. It deletes the keys of `data` if `duration` < 0 or given `value` is nil.

func (*AdapterMemory) SetIfNotExist 

func (c *AdapterMemory) SetIfNotExist(ctx context.Context, key interface{}, value interface{}, duration time.Duration) (bool, error)

SetIfNotExist sets cache with `key`-`value` pair which is expired after `duration` if `key` does not exist in the cache. It returns true the `key` does not exist in the cache, and it sets `value` successfully to the cache, or else it returns false.

It does not expire if `duration` == 0. It deletes the `key` if `duration` < 0 or given `value` is nil.

func (*AdapterMemory) SetIfNotExistFunc 

func (c *AdapterMemory) SetIfNotExistFunc(ctx context.Context, key interface{}, f func() (interface{}, error), duration time.Duration) (bool, error)

SetIfNotExistFunc sets `key` with result of function `f` and returns true if `key` does not exist in the cache, or else it does nothing and returns false if `key` already exists.

The parameter `value` can be type of `func() interface{}`, but it does nothing if its result is nil.

It does not expire if `duration` == 0. It deletes the `key` if `duration` < 0 or given `value` is nil.

func (*AdapterMemory) SetIfNotExistFuncLock 

func (c *AdapterMemory) SetIfNotExistFuncLock(ctx context.Context, key interface{}, f func() (interface{}, error), duration time.Duration) (bool, error)

SetIfNotExistFuncLock sets `key` with result of function `f` and returns true if `key` does not exist in the cache, or else it does nothing and returns false if `key` already exists.

It does not expire if `duration` == 0. It deletes the `key` if `duration` < 0 or given `value` is nil.

Note that it differs from function `SetIfNotExistFunc` is that the function `f` is executed within writing mutex lock for concurrent safety purpose.

func (*AdapterMemory) SetMap 

func (c *AdapterMemory) SetMap(ctx context.Context, data map[interface{}]interface{}, duration time.Duration) error

SetMap batch sets cache with key-value pairs by `data` map, which is expired after `duration`.

It does not expire if `duration` == 0. It deletes the keys of `data` if `duration` < 0 or given `value` is nil.

func (*AdapterMemory) Size 

func (c *AdapterMemory) Size(ctx context.Context) (size int, err error)

Size returns the size of the cache.

func (*AdapterMemory) Update 

func (c *AdapterMemory) Update(ctx context.Context, key interface{}, value interface{}) (oldValue *gvar.Var, exist bool, err error)

Update updates the value of `key` without changing its expiration and returns the old value. The returned value `exist` is false if the `key` does not exist in the cache.

It deletes the `key` if given `value` is nil. It does nothing if `key` does not exist in the cache.

func (*AdapterMemory) UpdateExpire 

func (c *AdapterMemory) UpdateExpire(ctx context.Context, key interface{}, duration time.Duration) (oldDuration time.Duration, err error)

UpdateExpire updates the expiration of `key` and returns the old expiration duration value.

It returns -1 and does nothing if the `key` does not exist in the cache. It deletes the `key` if `duration` < 0.

func (*AdapterMemory) Values 

func (c *AdapterMemory) Values(ctx context.Context) ([]interface{}, error)

Values returns all values in the cache as slice.

type Cache 

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

Cache struct.

func New 

func New(lruCap ...int) *Cache

New creates and returns a new cache object using default memory adapter. Note that the LRU feature is only available using memory adapter.

func NewWithAdapter 

func NewWithAdapter(adapter Adapter) *Cache

NewWithAdapter creates and returns a Cache object with given Adapter implements.

func (*Cache) KeyStrings 

func (c *Cache) KeyStrings(ctx context.Context) ([]string, error)

KeyStrings returns all keys in the cache as string slice.

func (*Cache) MustContains 

func (c *Cache) MustContains(ctx context.Context, key interface{}) bool

MustContains acts like Contains, but it panics if any error occurs.

func (*Cache) MustData 

func (c *Cache) MustData(ctx context.Context) map[interface{}]interface{}

MustData acts like Data, but it panics if any error occurs.

func (*Cache) MustGet 

func (c *Cache) MustGet(ctx context.Context, key interface{}) *gvar.Var

MustGet acts like Get, but it panics if any error occurs.

func (*Cache) MustGetExpire 

func (c *Cache) MustGetExpire(ctx context.Context, key interface{}) time.Duration

MustGetExpire acts like GetExpire, but it panics if any error occurs.

func (*Cache) MustGetOrSet 

func (c *Cache) MustGetOrSet(ctx context.Context, key interface{}, value interface{}, duration time.Duration) *gvar.Var

MustGetOrSet acts like GetOrSet, but it panics if any error occurs.

func (*Cache) MustGetOrSetFunc 

func (c *Cache) MustGetOrSetFunc(ctx context.Context, key interface{}, f func() (interface{}, error), duration time.Duration) *gvar.Var

MustGetOrSetFunc acts like GetOrSetFunc, but it panics if any error occurs.

func (*Cache) MustGetOrSetFuncLock 

func (c *Cache) MustGetOrSetFuncLock(ctx context.Context, key interface{}, f func() (interface{}, error), duration time.Duration) *gvar.Var

MustGetOrSetFuncLock acts like GetOrSetFuncLock, but it panics if any error occurs.

func (*Cache) MustKeyStrings 

func (c *Cache) MustKeyStrings(ctx context.Context) []string

MustKeyStrings acts like KeyStrings, but it panics if any error occurs.

func (*Cache) MustKeys 

func (c *Cache) MustKeys(ctx context.Context) []interface{}

MustKeys acts like Keys, but it panics if any error occurs.

func (*Cache) MustSize 

func (c *Cache) MustSize(ctx context.Context) int

MustSize acts like Size, but it panics if any error occurs.

func (*Cache) MustValues 

func (c *Cache) MustValues(ctx context.Context) []interface{}

MustValues acts like Values, but it panics if any error occurs.

func (*Cache) Removes 

func (c *Cache) Removes(ctx context.Context, keys []interface{}) error

Removes deletes `keys` in the cache.

func (*Cache) SetAdapter 

func (c *Cache) SetAdapter(adapter Adapter)

SetAdapter changes the adapter for this cache. Be very note that, this setting function is not concurrent-safe, which means you should not call this setting function concurrently in multiple goroutines.

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