merge example
Vladimir Bauer
7 years ago
| 0 | package main | |
| 1 | ||
| 2 | import ( | |
| 3 | "fmt" | |
| 4 | "math/rand" | |
| 5 | "sync" | |
| 6 | "time" | |
| 7 | ||
| 8 | "github.com/vbauerster/mpb/v4" | |
| 9 | "github.com/vbauerster/mpb/v4/decor" | |
| 10 | ) | |
| 11 | ||
| 12 | func init() { | |
| 13 | rand.Seed(time.Now().UnixNano()) | |
| 14 | } | |
| 15 | ||
| 16 | func main() { | |
| 17 | var wg sync.WaitGroup | |
| 18 | // pass &wg (optional), so p will wait for it eventually | |
| 19 | p := mpb.New(mpb.WithWaitGroup(&wg)) | |
| 20 | total, numBars := 100, 3 | |
| 21 | wg.Add(numBars) | |
| 22 | ||
| 23 | for i := 0; i < numBars; i++ { | |
| 24 | name := fmt.Sprintf("Bar#%d:", i) | |
| 25 | var pdecorators mpb.BarOption | |
| 26 | if i == 0 { | |
| 27 | pdecorators = mpb.PrependDecorators(decor.Name(name), | |
| 28 | // Merge to sync width with CountersNoUnit and Percentage decorators | |
| 29 | decor.Merge( | |
| 30 | decor.OnComplete(variadicName(decor.WCSyncSpace), "done"), | |
| 31 | decor.WCSyncSpace, // Placeholder | |
| 32 | ), | |
| 33 | ) | |
| 34 | } else { | |
| 35 | pdecorators = mpb.PrependDecorators(decor.Name(name), | |
| 36 | decor.CountersNoUnit("% .1d / % .1d", decor.WCSyncSpace), | |
| 37 | decor.Percentage(decor.WCSyncSpace), | |
| 38 | ) | |
| 39 | } | |
| 40 | bar := p.AddBar(int64(total), | |
| 41 | pdecorators, | |
| 42 | mpb.AppendDecorators( | |
| 43 | decor.OnComplete( | |
| 44 | // ETA decorator with ewma age of 60 | |
| 45 | decor.EwmaETA(decor.ET_STYLE_GO, 60), "done", | |
| 46 | ), | |
| 47 | ), | |
| 48 | ) | |
| 49 | // simulating some work | |
| 50 | go func() { | |
| 51 | defer wg.Done() | |
| 52 | max := 100 * time.Millisecond | |
| 53 | for i := 0; i < total; i++ { | |
| 54 | start := time.Now() | |
| 55 | time.Sleep(time.Duration(rand.Intn(10)+1) * max / 10) | |
| 56 | // ewma based decorators require work duration measurement | |
| 57 | bar.IncrBy(1, time.Since(start)) | |
| 58 | } | |
| 59 | }() | |
| 60 | } | |
| 61 | // Waiting for passed &wg and for all bars to complete and flush | |
| 62 | p.Wait() | |
| 63 | } | |
| 64 | ||
| 65 | func variadicName(wc decor.WC) decor.Decorator { | |
| 66 | wc.Init() | |
| 67 | d := &varName{ | |
| 68 | WC: wc, | |
| 69 | } | |
| 70 | return d | |
| 71 | } | |
| 72 | ||
| 73 | type varName struct { | |
| 74 | decor.WC | |
| 75 | complete *string | |
| 76 | } | |
| 77 | ||
| 78 | func (d *varName) Decor(st *decor.Statistics) string { | |
| 79 | if st.Completed && d.complete != nil { | |
| 80 | return d.FormatMsg(*d.complete) | |
| 81 | } | |
| 82 | if st.Current < 30 { | |
| 83 | return d.FormatMsg("low low low") | |
| 84 | } else if st.Current < 70 { | |
| 85 | return d.FormatMsg("medium medium medium") | |
| 86 | } else { | |
| 87 | return d.FormatMsg("high high high high high high") | |
| 88 | } | |
| 89 | } | |
| 90 | ||
| 91 | func (d *varName) OnCompleteMessage(msg string) { | |
| 92 | d.complete = &msg | |
| 93 | } |