golang 并行执行多任务-有返回值

golang 并行执行多任务-有返回值

func main() {
	now := time.Now()
	var wg sync.WaitGroup
	wg.Add(3)
	resMap := make(map[string]string)
	go func() {
		defer wg.Done()
		resMap["key1"] = OtherMethod(1)
	}()
	go func() {
		defer wg.Done()
		resMap["key2"] = OtherMethod(5)
	}()
	go func() {
		defer wg.Done()
		resMap["key5"] = OtherMethod(10)
	}()
	wg.Wait()
	marshal, _ := json.Marshal(resMap)
	log.Println("最终结果：", string(marshal))
	log.Println("耗时：", time.Since(now))
}

// @Description: 模拟执行外部任务
// @Author:luog
// @date: 2023-02-23 11:11:09
// @param sleepTime
// @return string
func OtherMethod(sleepTime int) string {
	log.Println("开始执行任务_", sleepTime)
	for i := 0; i < sleepTime; i++ {
		time.Sleep(time.Second)
	}
	log.Println("任务完成_", sleepTime)
	return "结果_" + strconv.Itoa(sleepTime)
}