Created
July 30, 2015 08:47
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GoLang concurrency
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| package main | |
| import ( | |
| "fmt" | |
| "net/http" | |
| "sync" | |
| "time" | |
| ) | |
| func main() { | |
| urls := []string{ | |
| "http://www.cnn.com", | |
| "http://espn.go.com/", | |
| "http://grantland.com", | |
| "http://www.newyorker.com/", | |
| } | |
| startIt := time.Now() | |
| without_goroutine(urls) | |
| endIt := time.Since(startIt) | |
| fmt.Printf("without goroutine elapsed time is %v\n\n", endIt.Seconds()) | |
| startIt = time.Now() | |
| with_goroutine(urls) | |
| endIt = time.Since(startIt) | |
| fmt.Printf("with goroutine elapsed time is %v\n\n", endIt.Seconds()) | |
| } | |
| func without_goroutine(urls []string) { | |
| for _, url := range urls { | |
| response, err := http.Get(url) | |
| if err != nil { | |
| panic(err) | |
| } | |
| fmt.Printf("%s: %s\n", url, response.Status) | |
| } | |
| } | |
| func with_goroutine(urls []string) { | |
| var wg sync.WaitGroup | |
| // number of concurrent goroutines to wait for: | |
| wg.Add(len(urls)) | |
| for _, url := range urls { | |
| go func(url string) { | |
| defer wg.Done() | |
| response, err := http.Get(url) | |
| if err != nil { | |
| panic(err) | |
| } | |
| fmt.Printf("%s: %s\n", url, response.Status) | |
| }(url) | |
| } | |
| wg.Wait() // waits until the url checks complete | |
| } |
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