mirror of
https://github.com/crazybber/awesome-patterns.git
synced 2024-11-23 13:06:02 +03:00
37 lines
729 B
Go
37 lines
729 B
Go
|
package main
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
"io/ioutil"
|
||
|
|
"net/http"
|
||
|
|
)
|
||
|
|
|
||
|
|
// A Future indicates any data that is needed in future but its computation
|
||
|
|
// can be started in parallel so that it can be fetched from the background when needed.
|
||
|
|
type data struct {
|
||
|
|
Body []byte
|
||
|
|
Error error
|
||
|
|
}
|
||
|
|
|
||
|
|
func futureData(url string) <-chan data {
|
||
|
|
c := make(chan data, 1)
|
||
|
|
go func() {
|
||
|
|
var body []byte
|
||
|
|
var err error
|
||
|
|
resp, err := http.Get(url)
|
||
|
|
defer resp.Body.Close()
|
||
|
|
body, err = ioutil.ReadAll(resp.Body)
|
||
|
|
c <- data{Body: body, Error: err}
|
||
|
|
}()
|
||
|
|
|
||
|
|
return c
|
||
|
|
}
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
future := futureData("http://test.future.com")
|
||
|
|
// do many other things
|
||
|
|
body := <-future
|
||
|
|
fmt.Printf("response: %#v", string(body.Body))
|
||
|
|
fmt.Printf("error: %#v", body.Error)
|
||
|
|
}
|