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package worker
import (
"context"
"errors"
"fmt"
"sync"
"time"
)
type (
// Task should watch for context
Task interface {
Start(context.Context) error
}
Work struct {
Name string
Task Task
wait time.Duration
}
TaskPool struct {
tasks []*Work
}
)
func NewTaskPool() *TaskPool {
return &TaskPool{}
}
func (w *Work) run(ctx context.Context) error {
// first time fire from the get go
timer := time.NewTimer(time.Nanosecond)
for {
select {
case <-ctx.Done():
return ctx.Err()
case <-timer.C:
fmt.Println("Process starting: ", w.Name)
if err := w.Task.Start(ctx); err != nil && !errors.Is(err, context.Canceled) {
fmt.Println("Process errored: ", w.Name, err.Error())
return err
} else {
fmt.Println("Process done: ", w.Name)
}
}
timer.Reset(w.wait)
}
}
func (self *TaskPool) AddTask(name string, wait time.Duration, task Task) {
self.tasks = append(self.tasks, &Work{
Name: name,
Task: task,
wait: wait,
})
}
func (self *TaskPool) Start(ctx context.Context) {
var wg sync.WaitGroup
wg.Add(len(self.tasks))
for _, w := range self.tasks {
go func(w *Work) {
_ = w.run(ctx)
wg.Done()
}(w)
}
wg.Wait()
}
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