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dispatcher.go
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/
dispatcher.go
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package goasync
import (
"context"
"fmt"
"time"
)
type (
// Task in queue that can be distributed to workers
dispatcher struct {
taskQueue chan Task
workerPool chan chan Task
errorHandler ErrorHandler
quit chan bool
workers []*worker
}
worker struct {
id int
workerPool chan chan Task
taskChannel chan Task
errorHandler ErrorHandler
timeout time.Duration
quit chan bool
}
)
// Start a dispatcher
func (d *dispatcher) start() {
for _, worker := range d.workers {
go worker.start()
}
go d.dispatcher()
}
// Stop a dispatcher
func (d *dispatcher) stop() {
for _, worker := range d.workers {
worker.stop()
}
d.quit <- true
}
// Tasks will send to workers
func (d *dispatcher) dispatcher() {
defer func() {
if r := recover(); r != nil {
d.errorHandler(fmt.Errorf("[err] dispatcher dispatcher panic %w", r.(error)))
go d.dispatcher()
}
}()
for {
select {
case task := <-d.taskQueue:
workerTaskChannel := <-d.workerPool
workerTaskChannel <- task
case <-d.quit:
// delete all workers
for len(d.workerPool) > 0 {
<-d.workerPool
}
return
}
}
}
// Start a worker
func (w *worker) start() {
defer func() {
if r := recover(); r != nil {
w.errorHandler(fmt.Errorf("[err] worker start panic %w", r.(error)))
go w.start()
}
}()
// worker ready
w.workerPool <- w.taskChannel
for {
select {
case task := <-w.taskChannel:
ctx, cancel := context.WithTimeout(context.Background(), w.timeout)
if err := task.Process(ctx); err != nil {
w.errorHandler(err)
}
cancel()
w.workerPool <- w.taskChannel
case <-w.quit: // end
return
}
}
}
// Stop a worker
func (w *worker) stop() {
w.quit <- true
}