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Golang concurrency
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| package main | |
| import ( | |
| "fmt" | |
| "io" | |
| "io/ioutil" | |
| "net/http" | |
| "time" | |
| ) | |
| func main() { | |
| start := time.Now() | |
| channel := make(chan string) | |
| sites := []struct{ name, url string }{ | |
| {"Go", "http://golang.org"}, | |
| {"Haskell", "http://haskell.org"}, | |
| {"Python", "http://python.org"}, | |
| } | |
| for _, site := range sites { | |
| go get(site.name, site.url, channel) | |
| } | |
| for i := 0; i < len(sites); i++ { | |
| fmt.Print(<-channel) | |
| } | |
| duration := time.Since(start).Seconds() | |
| fmt.Printf("Finished in %.2f seconds", duration) | |
| } | |
| func get(name, url string, channel chan<- string) { | |
| start := time.Now() | |
| res, err := http.Get(url) | |
| if err != nil { | |
| channel <- fmt.Sprintf("%s: %s", name, err) | |
| return | |
| } | |
| size, _ := io.Copy(ioutil.Discard, res.Body) | |
| res.Body.Close() | |
| duration := time.Since(start).Seconds() | |
| channel <- fmt.Sprintf("%s (%s) [%d bytes in %.2fs]\n", name, url, size, duration) | |
| } |
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