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|
package worker
import (
"context"
"errors"
"sync"
)
type (
// A simple worker to deal with list.
ChanProcessor[T any] interface {
Query(context.Context) (<-chan T, error)
Process(context.Context, T) error
}
ListProcessor[T any] interface {
Query(context.Context) ([]T, error)
Process(context.Context, T) error
}
chanProcessorWorker[T any] struct {
chanProcessor ChanProcessor[T]
scheduler *Scheduler
}
listProcessorWorker[T any] struct {
listProcessor ListProcessor[T]
scheduler *Scheduler
}
)
func NewWorkerFromListProcessor[T any](
listProcessor ListProcessor[T],
scheduler *Scheduler,
) Worker {
return &listProcessorWorker[T]{
listProcessor: listProcessor,
scheduler: scheduler,
}
}
func NewWorkerFromChanProcessor[T any](
listProcessor ChanProcessor[T],
scheduler *Scheduler,
) Worker {
return &chanProcessorWorker[T]{
chanProcessor: listProcessor,
scheduler: scheduler,
}
}
func (l *listProcessorWorker[T]) Start(ctx context.Context) error {
for {
values, err := l.listProcessor.Query(ctx)
if err != nil {
return err
}
select {
case <-ctx.Done():
return ctx.Err()
default:
}
if len(values) == 0 {
return nil
}
var wg sync.WaitGroup
for _, v := range values {
wg.Add(1)
l.scheduler.Take()
go func(v T) {
defer l.scheduler.Return()
defer wg.Done()
if err := l.listProcessor.Process(ctx, v); err != nil && !errors.Is(err, context.Canceled) {
println("Err", err.Error())
}
}(v)
}
wg.Wait()
}
}
func (l *chanProcessorWorker[T]) Start(ctx context.Context) error {
c, err := l.chanProcessor.Query(ctx)
if err != nil {
return err
}
for {
select {
case <-ctx.Done():
return ctx.Err()
case v, ok := <-c:
if !ok {
return nil
}
if err := l.chanProcessor.Process(ctx, v); err != nil {
return err
}
}
}
}
|
