Is there a way to do repetitive tasks at intervals

Question

Is there a way to do repetitive background tasks in Go   I m thinking of something like Timer schedule task  delay  period  in Java   I know I can do this with a goroutine and Time sleep    but I d like something that easily stopped   Here s what I got  but looks ugly to me   Is there a cleaner better way   func oneWay         var f func       var t  time Timer      f   func              fmt Println  doing stuff           t   time AfterFunc time Duration 5    time Second  f             t   time AfterFunc time Duration 5    time Second  f       defer t Stop          simulate doing stuff     time Sleep time Minute

User · Answer

A broader answer to this question might consider the Lego brick approach often used in Occam, and offered to the Java community via JCSP. There is a very good presentation by Peter Welch on this idea.

This plug-and-play approach translates directly to Go, because Go uses the same Communicating Sequential Process fundamentals as does Occam.

So, when it comes to designing repetitive tasks, you can build your system as a dataflow network of simple components (as goroutines) that exchange events (i.e. messages or signals) via channels.

This approach is compositional: each group of small components can itself behave as a larger component, ad infinitum. This can be very powerful because complex concurrent systems are made from easy to understand bricks.

Footnote: in Welch's presentation, he uses the Occam syntax for channels, which is ! and ? and these directly correspond to ch<- and <-ch in Go.

User · Answer

How about something like   package main  import        fmt       time     func schedule what func    delay time Duration  chan bool       stop    make chan bool       go func             for               what               select               case  lt -time After delay               case  lt -stop                  return                                      return stop    func main         ping    func     fmt Println             stop    schedule ping  5 time Millisecond      time Sleep 25   time Millisecond      stop  lt - true     time Sleep 25   time Millisecond       fmt Println  Done       Playground

User · Answer

I use the following code   package main  import        fmt       time     func main         now    time Now       fmt Println   nToday    now       after    now Add 1   time Minute      fmt Println   nAdd 1 Minute    after       for           fmt Println  test           time Sleep 10   time Second           now   time Now            if now After after                break                      fmt Println  done       It is more simple and works fine to me

User · Answer

The function time NewTicker makes a channel that sends a periodic message  and provides a way to stop it  Use it something like this  untested    ticker    time NewTicker 5   time Second  quit    make chan struct    go func         for          select           case  lt - ticker C                 do stuff         case  lt - quit              ticker Stop               return                        You can stop the worker by closing the quit channel  close quit

User · Answer

If you do not care about tick shifting  depending on how long did it took previously on each execution  and you do not want to use channels  it s possible to use native range function    i e    package main  import  fmt  import  time   func main         go heartBeat       time Sleep time Second   5     func heartBeat         for range time Tick time Second   1            fmt Println  Foo             Playground

User · Answer

If you want to stop it in any moment ticker  ticker    time NewTicker 500   time Millisecond  go func         for range ticker C           fmt Println  Tick             time Sleep 1600   time Millisecond  ticker Stop     If you do not want to stop it tick   tick    time Tick 500   time Millisecond  for range tick       fmt Println  Tick

User · Answer

Check out this library  https   github com robfig cron  Example as below   c    cron New   c AddFunc  0 30           func     fmt Println  Every hour on the half hour      c AddFunc   hourly        func     fmt Println  Every hour      c AddFunc   every 1h30m   func     fmt Println  Every hour thirty      c Start

[go] Is there a way to do repetitive tasks at intervals?

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