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singleWorkerQueue.go
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singleWorkerQueue.go
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package queue
import (
"container/list"
"sync"
"go.uber.org/atomic"
)
type oneWorkerQueue struct {
inUse atomic.Bool
addedToQueue atomic.Bool
mutex sync.Mutex
queue *list.List
deleteFromQueue func()
deleted bool
}
func (q *oneWorkerQueue) append(tasks []func()) bool {
q.mutex.Lock()
defer q.mutex.Unlock()
if q.deleted {
return false
}
for _, t := range tasks {
q.queue.PushBack(t)
}
return true
}
func (q *oneWorkerQueue) freeLocked() {
q.queue.Init()
q.deleteFromQueue()
q.deleted = true
}
func (q *oneWorkerQueue) pop() func() {
q.mutex.Lock()
defer q.mutex.Unlock()
if q.queue.Len() > 0 {
return q.queue.Remove(q.queue.Front()).(func())
}
q.freeLocked()
return nil
}
func (q *oneWorkerQueue) free() {
q.mutex.Lock()
defer q.mutex.Unlock()
q.freeLocked()
}
func (q *Queue) makeDeleteFromQueue(key interface{}) func() {
return func() {
q.oneworkerQueue.Delete(key)
}
}
func (q *Queue) appendOneWorker(key interface{}, tasks []func()) (w *oneWorkerQueue) {
for {
val, _ := q.oneworkerQueue.LoadOrStore(key, &oneWorkerQueue{
queue: list.New(),
deleteFromQueue: q.makeDeleteFromQueue(key),
})
v := val.(*oneWorkerQueue)
if v.append(tasks) {
return v
}
}
}
// SubmitForOneWorker function adds tasks to the Queue by key. The tasks in the Queue are executed in the order they are submitted by the Goroutine.
func (q *Queue) SubmitForOneWorker(key interface{}, tasks ...func()) error {
w := q.appendOneWorker(key, tasks)
if w.addedToQueue.Load() {
return nil
}
err := q.Submit(func() {
val, ok := q.oneworkerQueue.Load(key)
if !ok {
return
}
v := val.(*oneWorkerQueue)
if !v.inUse.CompareAndSwap(false, true) {
return
}
for {
task := v.pop()
if task == nil {
return
}
task()
}
})
if err == nil {
w.addedToQueue.Store(true)
return nil
}
if !w.inUse.CompareAndSwap(false, true) {
w.addedToQueue.Store(true)
// one goroutine processes task from one worker queue
return nil
}
w.free()
return err
}