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taskres.go
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taskres.go
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package gosync
import (
"context"
"time"
)
type TaskRes[R any] interface {
IsDone() bool
Wait() R
WaitCtx(ctx context.Context) (R, error)
WaitTimeout(timeout time.Duration) (R, error)
}
var _ TaskRes[interface{}] = (*taskRes[interface{}])(nil)
type taskRes[R any] struct {
doneCh chan struct{}
res R
}
func newTaskR[R any]() *taskRes[R] {
return &taskRes[R]{
doneCh: make(chan struct{}),
}
}
func (t *taskRes[R]) done(res R) {
t.res = res
close(t.doneCh)
}
func (t *taskRes[R]) IsDone() bool {
select {
case <-t.doneCh:
return true
default:
return false
}
}
func (t *taskRes[R]) Wait() R {
<-t.doneCh
return t.res
}
func (t *taskRes[R]) WaitCtx(ctx context.Context) (R, error) {
var nilVal R
select {
case <-ctx.Done():
return nilVal, ctx.Err()
case <-t.doneCh:
return t.res, nil
}
}
func (t *taskRes[R]) WaitTimeout(timeout time.Duration) (R, error) {
ctx, cancel := context.WithTimeout(context.Background(), timeout)
defer cancel()
return t.WaitCtx(ctx)
}
// GoRes runs fn in a goroutine and returns a TaskRes that
// can be used to wait for the result.
func GoRes[R any](fn func() R) TaskRes[R] {
t := newTaskR[R]()
go func() {
res := fn()
t.done(res)
}()
return t
}
func WaitAllRes[R any](tasks ...TaskRes[R]) []R {
res := make([]R, len(tasks))
for i, t := range tasks {
res[i] = t.Wait()
}
return res
}
func WaitAllResCtx[R any](ctx context.Context, tasks ...TaskRes[R]) ([]R, error) {
res := make(chan []R)
go func() {
res <- WaitAllRes(tasks...)
}()
var nilVal []R
select {
case <-ctx.Done():
return nilVal, ctx.Err()
case r := <-res:
return r, nil
}
}
func WaitAllResTimeout[R any](timeout time.Duration, tasks ...TaskRes[R]) ([]R, error) {
ctx, cancel := context.WithTimeout(context.Background(), timeout)
defer cancel()
return WaitAllResCtx(ctx, tasks...)
}
func WaitAnyRes[R any](tasks ...TaskRes[R]) R {
ch := make(chan R)
for _, t := range tasks {
go func(t TaskRes[R]) {
ch <- t.Wait()
}(t)
}
return <-ch
}
func WaitAnyResCtx[R any](ctx context.Context, tasks ...TaskRes[R]) (R, error) {
ch := make(chan R)
go func() {
ch <- WaitAnyRes(tasks...)
}()
var nilVal R
select {
case <-ctx.Done():
return nilVal, ctx.Err()
case r := <-ch:
return r, nil
}
}
func WaitAnyResTimeout[R any](timeout time.Duration, tasks ...TaskRes[R]) (R, error) {
ctx, cancel := context.WithTimeout(context.Background(), timeout)
defer cancel()
return WaitAnyResCtx(ctx, tasks...)
}