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Published: Jun 4, 2018 License: MIT Imports: 2 Imported by: 0




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type ExclusivePool

type ExclusivePool struct {
	// contains filtered or unexported fields

ExclusivePool is a pool of non-identical instances that only one instance with same identity is in the pool at a time. In other words, only instances with different identities can be in the pool the same time. If another instance with same identity tries to get into the pool, it hangs until previous instance left the pool.

This pool is particularly useful for performing tasks on same resource on the file system in different goroutines.

func NewExclusivePool

func NewExclusivePool() *ExclusivePool

NewExclusivePool initializes and returns a new ExclusivePool object.

func (*ExclusivePool) CheckIn

func (p *ExclusivePool) CheckIn(identity string)

CheckIn checks in an instance to the pool and hangs while instance with same indentity is using the lock.

func (*ExclusivePool) CheckOut

func (p *ExclusivePool) CheckOut(identity string)

CheckOut checks out an instance from the pool and releases the lock to let other instances with same identity to grab the lock.

type StatusTable

type StatusTable struct {
	// contains filtered or unexported fields

StatusTable is a table maintains true/false values.

This table is particularly useful for un/marking and checking values in different goroutines.

func NewStatusTable

func NewStatusTable() *StatusTable

NewStatusTable initializes and returns a new StatusTable object.

func (*StatusTable) IsRunning

func (p *StatusTable) IsRunning(name string) bool

IsRunning checks if value of given name is set to true in the pool.

func (*StatusTable) Start

func (p *StatusTable) Start(name string)

Start sets value of given name to true in the pool.

func (*StatusTable) Stop

func (p *StatusTable) Stop(name string)

Stop sets value of given name to false in the pool.

type UniqueQueue

type UniqueQueue struct {
	// contains filtered or unexported fields

UniqueQueue is a queue which guarantees only one instance of same identity is in the line. Instances with same identity will be discarded if there is already one in the line.

This queue is particularly useful for preventing duplicated task of same purpose.

func NewUniqueQueue

func NewUniqueQueue(queueLength int) *UniqueQueue

NewUniqueQueue initializes and returns a new UniqueQueue object.

func (*UniqueQueue) Add

func (q *UniqueQueue) Add(id interface{})

Add adds new instance to the queue.

func (*UniqueQueue) AddFunc

func (q *UniqueQueue) AddFunc(id interface{}, fn func())

AddFunc adds new instance to the queue with a custom runnable function, the queue is blocked until the function exits.

func (*UniqueQueue) Exist

func (q *UniqueQueue) Exist(id interface{}) bool

Exist returns true if there is an instance with given indentity exists in the queue.

func (*UniqueQueue) Queue

func (q *UniqueQueue) Queue() <-chan string

Queue returns channel of queue for retrieving instances.

func (*UniqueQueue) Remove

func (q *UniqueQueue) Remove(id interface{})

Remove removes instance from the queue.

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