Question

我想动态更改我的自动收报机间隔。

我写了一个例子来告诉你我是怎么做的。我的用例不是“加速度计”，但我希望它能给你一个想法。

http://play.golang.org/p/6ANFnoE6pA

package main

import (
    "time"
    "log"
    "fmt"
)

func main() {
    interval := float64(1000)

    ticker := time.NewTicker(time.Duration(interval) * time.Millisecond)
    go func(){
        counter := 1.0
        for range ticker.C {
            log.Println("ticker accelerating to " + fmt.Sprint(interval/counter) + " ms")
            ticker = time.NewTicker(time.Duration(interval/counter) * time.Millisecond)
            counter++
        }
        log.Println("stopped")
    }()
    time.Sleep(5 * time.Second)
    log.Println("stopping ticker")
    ticker.Stop()
}

错误的是，股票代码每秒都会“嘀嗒”一次并且不会加速......有什么想法吗？

Answer 1

回答@fzerorubigd，但更完整一点。

如前所述，我们不能在这种情况下使用range，因为range循环缓存要变量的变量，然后它就不会被覆盖（例如这里：http://play.golang.org/p/yZvrgURz4o）

然后，我们应该使用for - select组合循环。此后的工作解决方案：

http://play.golang.org/p/3uJrAIhnTQ

package main

import (
    "time"
    "log"
    "fmt"
)

func main() {
    start_interval := float64(1000)
    quit := make(chan bool)

    go func(){
        ticker := time.NewTicker(time.Duration(start_interval) * time.Millisecond)
        counter := 1.0

        for {
            select {
            case <-ticker.C:
                log.Println("ticker accelerating to " + fmt.Sprint(start_interval/counter) + " ms")
                ticker.Stop()
                ticker = time.NewTicker(time.Duration(start_interval/counter) * time.Millisecond)
                counter++
            case <-quit:
                ticker.Stop()
                log.Println("..ticker stopped!")
                return
            }
        }
    }()

    time.Sleep(5 * time.Second)

    log.Println("stopping ticker...")
    quit<-true

    time.Sleep(500 * time.Millisecond) // just to see quit messages
}

Answer 2

正如Nipun Talukdar所说，“for”捕获频道并使用相同的参考进行迭代。如果你这样使用它会修复：

playground

package main

import (
    "fmt"
    "log"
    "time"
)

func main() {
    interval := float64(1000)

    ticker := time.NewTicker(time.Duration(interval) * time.Millisecond)
    go func() {
        counter := 1.0
        for {
            select {
            case <-ticker.C:
                log.Println("ticker accelerating to " + fmt.Sprint(interval/counter) + " ms")
                ticker = time.NewTicker(time.Duration(interval/counter) * time.Millisecond)
                counter++
            }
        }
        log.Println("stopped")
    }()
    time.Sleep(5 * time.Second)
    log.Println("stopping ticker")
    ticker.Stop()
}

Answer 3

这段代码呢？

https://play.golang.org/p/wyOTVxUW5Xj

package main

import (
    "fmt"
    "log"
    "time"
)

func main() {
    startInterval := float64(1000)
    quit := make(chan bool)

    go func() {
        counter := 1.0
        for {
            select {
            case <-time.After(time.Duration(startInterval/counter) * time.Millisecond):
                log.Println("ticker accelerating to " + fmt.Sprint(startInterval/counter) + " ms")
                counter++
            case <-quit:
                log.Println("..ticker stopped!")
                return
            }
        }
    }()

    time.Sleep(5 * time.Second)
    log.Println("stopping ticker...")
    quit <- true
    time.Sleep(500 * time.Millisecond) // just to see quit messages
}

Answer 4

为什么在go1.15 ticker.Reset中创建了代码，您无需创建新的代码即可使用ticker.Reset("new duration")更新现有代码行情持续时间，现在您就不会遇到任何缓存问题 >

Go playground

package main

import (
    "fmt"
    "log"
    "time"
)

func main() {
    interval := float64(1000)

    ticker := time.NewTicker(time.Duration(interval) * time.Millisecond)
    go func(){
        counter := 1.0
        for range ticker.C {
            log.Println("ticker accelerating to " + fmt.Sprint(interval/counter) + " ms")
            ticker.Reset(time.Duration(interval/counter) * time.Millisecond)
            counter++
        }
        log.Println("stopped")
    }()
    time.Sleep(5 * time.Second)
    log.Println("stopping ticker")
    ticker.Stop()
}

您的示例出现缓存问题的原因是，当您将ticker变量重新分配为*time.ticker结构时，只需将原始*time.ticker结构与ticker变量断开链接但是循环仍处于原始代码行情的潮流中，您需要重新设置新的time.ticker.c

的新循环

动态改变股票代码间隔

4 个答案: