package main import ( "fmt" "time" ) func main() { requests := make(chan int, 5) for i := 1; i <= 2; i++ { requests <- i } close(requests) limiter := time.Tick(time.Millisecond * 200) for req := range requests { //会循环两次,前面往requests channel中发送了两个值 <-limiter //执行到这里,需要隔 200毫秒才继续往下执行,time.Tick(timer)上面已定义 fmt.Println("request", req, time.Now()) } burstyLimiter := make(chan time.Time, 3) for i := 0; i < 3; i++ { burstyLimiter <- time.Now() //这里burstyLimiter channel 连续发送了三次值 } go func() { for t := range time.Tick(time.Second * 2) { burstyLimiter <- t // 这里往burstyLimiter channel 循环发送time.Tick } }() burstyRequests := make(chan int, 5) for i := 1; i <= 5; i++ { burstyRequests <- i <-burstyLimiter //前三次没有速度限制,会直接打印出后面的println的内容 fmt.Println("request", i, time.Now()) } close(burstyRequests) for req := range burstyRequests { <-burstyLimiter //继续接收burstyLimiter值,除了前三次,后面的都是time.Tick进行速度限制,2秒打印一次,直到此次循环结束 fmt.Println("request", req, time.Now()) } }
注,把time.Tick(time.Second)中的值改为秒会更容易查看效果
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