timer.go

package main

import (
    "github.com/thehivecorporation/log"
    "math/rand"
    "time"
)

func main() {
    ch := make(chan struct{})
    waitduration := 500 * time.Millisecond

    timer := time.NewTimer(waitduration)

    go func() {
        rand.Seed(33)

        for {
            time.Sleep(time.Millisecond * time.Duration(rand.Intn(1000)))
            ch <- struct{}{}
        }
    }()

    for {
        select {
        case _ = <-ch:
            log.Info("Value received")
        case <-timer.C:
            log.Info("Too much time waited")
        }

        timer.Reset(waitduration)
    }
}