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| package main | |
| import ( | |
| "fmt" | |
| "strings" | |
| ) | |
| func main() { | |
| wisdomPipe := make(chan string) | |
| mantraPipe := make(chan string) | |
| echoPipe := make(chan string) | |
| donePipe := make(chan struct{}) | |
| defer close(donePipe) | |
| go func(done <-chan struct{}, in <-chan string, out chan string) { | |
| defer close(wisdomPipe) | |
| for wiseWords := range in { | |
| select { | |
| case out <- wiseWords: | |
| fmt.Println(wiseWords) | |
| case <-done: | |
| return | |
| } | |
| } | |
| }(donePipe, wisdomPipe, mantraPipe) | |
| go func(done <-chan struct{}, in <-chan string, out chan string) { | |
| defer close(mantraPipe) | |
| for mantra := range in { | |
| select { | |
| case out <- strings.ToUpper(mantra): | |
| case <-done: | |
| return | |
| } | |
| } | |
| }(donePipe, mantraPipe, echoPipe) | |
| go func(done <-chan struct{}, in <-chan string) { | |
| defer close(echoPipe) | |
| for echo := range in { | |
| select { | |
| case <-done: | |
| return | |
| default: | |
| fmt.Println(echo) | |
| } | |
| } | |
| }(donePipe, echoPipe) | |
| wordsOfWisdom := []string{ | |
| "Do not communicate by sharing memory;", | |
| "instead, share memory by communicating.", | |
| } | |
| for _, words := range wordsOfWisdom { | |
| wisdomPipe <- words | |
| } | |
| } |
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