1package worker
 2
 3import (
 4	"context"
 5	"errors"
 6	"fmt"
 7	"sync"
 8)
 9
10type (
11	// Worker should watch for context
12	Worker interface {
13		Start(context.Context) error
14	}
15
16	Work struct {
17		Name   string
18		Worker Worker
19	}
20
21	WorkerPool struct {
22		workers []*Work
23		wg      sync.WaitGroup
24	}
25)
26
27func NewWorkerPool() *WorkerPool {
28	return &WorkerPool{}
29}
30
31func (self *WorkerPool) AddWorker(name string, worker Worker) {
32	self.workers = append(self.workers, &Work{
33		Name:   name,
34		Worker: worker,
35	})
36}
37
38func (self *WorkerPool) Start(ctx context.Context) {
39	self.wg.Add(len(self.workers))
40	for _, w := range self.workers {
41		go func(w *Work) {
42			defer self.wg.Done()
43			if err := w.Worker.Start(ctx); err != nil && !errors.Is(err, context.Canceled) {
44				fmt.Println("Processes finished, error", w.Name, err.Error())
45			} else {
46				fmt.Println(w.Name, "done")
47			}
48		}(w)
49	}
50}
51
52func (self *WorkerPool) Wait() {
53	self.wg.Wait()
54}