Interval Function Golang

polling.go

package main

import (
  "fmt"
  "time"
  "net/http"
)

func doSomething(s string) {
  fmt.Println("doing something", s)
}

func startPolling1() {
  for {
    time.Sleep(2 * time.Second)
    go doSomething("from polling 1")
  }
}

func startPolling2() {
  for {
    <-time.After(2 * time.Second)
    go doSomething("from polling 2")
  }
}

func handler(w http.ResponseWriter, r *http.Request) {
  fmt.Fprintf(w, "Hi there, I love %s!", r.URL.Path[1:])
}

func main() {
  go startPolling1()
  go startPolling2()

  http.HandleFunc("/", handler)
  http.ListenAndServe(":8080", nil)
}

ticker.go

package util

import (
	"time"
)

// Scheduler ...
type Scheduler struct {
	ticker  *time.Ticker
	quit    chan struct{}
	process func()
}

// NewScheduler ...
func NewScheduler(process func()) *Scheduler {
	return &Scheduler{
		ticker:  time.NewTicker(time.Minute),
		quit:    make(chan struct{}),
		process: process,
	}
}

// Run ...
func (t *Scheduler) Run() {
	for {
		select {
		case <-t.ticker.C:
			go func() {
				t.process()
			}()
		case <-t.quit:
			t.ticker.Stop()
			return
		}
	}
}

// Stop ...
func (t *Scheduler) Stop() {
	close(t.quit)
}

time_tick.go

package main

import (
	"fmt"
	"time"
)

// Suggestions from golang-nuts
// http://play.golang.org/p/Ctg3_AQisl

func doEvery(d time.Duration, f func(time.Time)) {
	for x := range time.Tick(d) {
		f(x)
	}
}

func helloworld(t time.Time) {
	fmt.Printf("%v: Hello, World!\n", t)
}

func main() {
	doEvery(20*time.Second, helloworld)
}