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package ephemeral
import (
"github.com/spiral/jobs/v2"
"sync"
"sync/atomic"
"time"
)
type queue struct {
on int32
state *jobs.Stat
// job pipeline
concurPool chan interface{}
jobs chan *entry
// on operations
muw sync.Mutex
wg sync.WaitGroup
// stop channel
wait chan interface{}
// exec handlers
execPool chan jobs.Handler
errHandler jobs.ErrorHandler
}
type entry struct {
id string
job *jobs.Job
attempt int
}
// create new queue
func newQueue(maxConcur int) *queue {
q := &queue{state: &jobs.Stat{}, jobs: make(chan *entry)}
if maxConcur != 0 {
q.concurPool = make(chan interface{}, maxConcur)
for i := 0; i < maxConcur; i++ {
q.concurPool <- nil
}
}
return q
}
// serve consumers
func (q *queue) serve() {
q.wait = make(chan interface{})
atomic.StoreInt32(&q.on, 1)
for {
e := q.consume()
if e == nil {
q.wg.Wait()
return
}
if q.concurPool != nil {
<-q.concurPool
}
atomic.AddInt64(&q.state.Active, 1)
h := <-q.execPool
go func(h jobs.Handler, e *entry) {
defer q.wg.Done()
q.do(h, e)
atomic.AddInt64(&q.state.Active, ^int64(0))
q.execPool <- h
if q.concurPool != nil {
q.concurPool <- nil
}
}(h, e)
}
}
// allocate one job entry
func (q *queue) consume() *entry {
q.muw.Lock()
defer q.muw.Unlock()
select {
case <-q.wait:
return nil
case e := <-q.jobs:
q.wg.Add(1)
return e
}
}
// do singe job
func (q *queue) do(h jobs.Handler, e *entry) {
err := h(e.id, e.job)
if err == nil {
atomic.AddInt64(&q.state.Queue, ^int64(0))
return
}
q.errHandler(e.id, e.job, err)
if !e.job.Options.CanRetry(e.attempt) {
atomic.AddInt64(&q.state.Queue, ^int64(0))
return
}
q.push(e.id, e.job, e.attempt+1, e.job.Options.RetryDuration())
}
// stop the queue consuming
func (q *queue) stop() {
if atomic.LoadInt32(&q.on) == 0 {
return
}
close(q.wait)
q.muw.Lock()
q.wg.Wait()
q.muw.Unlock()
atomic.StoreInt32(&q.on, 0)
}
// add job to the queue
func (q *queue) push(id string, j *jobs.Job, attempt int, delay time.Duration) {
if delay == 0 {
atomic.AddInt64(&q.state.Queue, 1)
go func() {
q.jobs <- &entry{id: id, job: j, attempt: attempt}
}()
return
}
atomic.AddInt64(&q.state.Delayed, 1)
go func() {
time.Sleep(delay)
atomic.AddInt64(&q.state.Delayed, ^int64(0))
atomic.AddInt64(&q.state.Queue, 1)
q.jobs <- &entry{id: id, job: j, attempt: attempt}
}()
}
func (q *queue) stat() *jobs.Stat {
return &jobs.Stat{
InternalName: ":memory:",
Queue: atomic.LoadInt64(&q.state.Queue),
Active: atomic.LoadInt64(&q.state.Active),
Delayed: atomic.LoadInt64(&q.state.Delayed),
}
}
|
