转发大佬使用 Go 实现 Async/Await 模式 - Golang发烧友的文章 - 知乎
package async
import "context"
type Future interface {
Await() interface{}
}
type future struct {
await func(ctx context.Context) interface{}
}
func (f future) Await() interface{} {
return f.await(context.Background())
}
// Exec executes the async function
func Exec(f func() interface{}) Future {
var result interface{}
c := make(chan struct{})
go func() {
defer close(c)
result = f()
}()
return future{
await: func(ctx context.Context) interface{} {
select {
case <-ctx.Done():
return ctx.Err()
case <-c:
return result
}
},
}
}
func DoneAsync() int {
fmt.Println("Warming up ...")
time.Sleep(3 * time.Second)
fmt.Println("Done ...")
return 1
}
func main() {
fmt.Println("Let's start ...")
future := async.Exec(func() interface{} {
return DoneAsync()
})
fmt.Println("Done is running ...")
val := future.Await()
fmt.Println(val)
}
