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| package main | |
| import ( | |
| "fmt" | |
| "sync" | |
| "time" | |
| ) | |
| type PayloadInt64 struct { | |
| number int64 | |
| } | |
| type Task struct { | |
| id int64 | |
| payload PayloadInt64 | |
| } | |
| type TaskResult struct { | |
| id int64 | |
| result int64 | |
| } | |
| func sqrWorkderWithTaskID(wg *sync.WaitGroup, tasks <-chan Task, results chan<- TaskResult) { | |
| for task := range tasks { | |
| time.Sleep(100 * time.Millisecond) | |
| fmt.Printf("[task %v] [payload %v]is running\n", task.id, task.payload.number) | |
| results <- TaskResult{ | |
| id: task.id, | |
| result: task.payload.number * task.payload.number, | |
| } | |
| } | |
| wg.Done() | |
| } | |
| func main() { | |
| var wg sync.WaitGroup | |
| tasks := make(chan Task, 10) | |
| results := make(chan TaskResult, 10) | |
| // launching 3 worker goroutines | |
| for i := 0; i < 3; i++ { | |
| wg.Add(1) | |
| go sqrWorkderWithTaskID(&wg, tasks, results) | |
| } | |
| taskNum := 10 | |
| for i := 0; i < taskNum; i++ { | |
| tasks <- Task{ | |
| id: int64(i), | |
| payload: PayloadInt64{ | |
| number: int64(i) * 2, | |
| }, | |
| } | |
| } | |
| close(tasks) | |
| wg.Wait() | |
| for i := 0; i < taskNum; i++ { | |
| result := <-results | |
| fmt.Printf("[result] %v : [task %v] [payload %v]\n", i, result.id, result.result) | |
| } | |
| } |
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