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package main
import (
"fmt"
"os"
"sort"
"strings"
"sync"
"time"
)
type JobWaitGroup struct {
lock sync.RWMutex
jobs map[string]time.Duration
wg sync.WaitGroup
}
func (jwg *JobWaitGroup) Do(name string, fn func()) {
jwg.lock.Lock()
defer jwg.lock.Unlock()
if jwg.jobs == nil {
jwg.jobs = make(map[string]time.Duration)
}
if _, dup := jwg.jobs[name]; dup {
panic(fmt.Sprintf("job %q already exists", name))
}
jwg.jobs[name] = -1
jwg.wg.Add(1)
start := time.Now()
go func() {
defer func() {
jwg.lock.Lock()
defer jwg.lock.Unlock()
jwg.jobs[name] = time.Now().Sub(start)
jwg.wg.Done()
}()
fn()
}()
}
func (jwg *JobWaitGroup) Wait() {
jwg.wg.Wait()
}
func (jwg *JobWaitGroup) Status() (int, []string) {
jwg.lock.RLock()
n := len(jwg.jobs)
var jobs []string
for job, duration := range jwg.jobs {
if duration < 0 {
jobs = append(jobs, job)
}
}
defer jwg.lock.RUnlock()
sort.Strings(jobs)
return n, jobs
}
func (jwg *JobWaitGroup) Watch(d time.Duration) {
ticker := time.NewTicker(d)
done := make(chan struct{})
go func() {
jwg.Wait()
ticker.Stop()
done <- struct{}{}
}()
for {
select {
case <-ticker.C:
n, jobs := jwg.Status()
if len(jobs) == 0 {
panic("no active jobs, but wg still waiting")
}
line := fmt.Sprintf("%d/%d : %v", len(jobs), n, strings.Join(jobs, ", "))
if len(line) > 70 {
line = line[:67] + "..."
}
fmt.Fprintf(os.Stderr, "\r%-70s", line)
case <-done:
fmt.Fprintf(os.Stderr, "\r%-70s\n", "done")
jwg.lock.RLock()
defer jwg.lock.RUnlock()
s := newSortHelper(jwg.jobs)
sort.Sort(s)
for _, job := range s.StringSlice {
fmt.Fprintln(os.Stderr, s.times[job], job)
}
return
}
}
}
type sortHelper struct {
times map[string]time.Duration
sort.StringSlice
}
func (s sortHelper) Less(i, j int) bool {
return s.times[s.StringSlice[i]] < s.times[s.StringSlice[j]]
}
func newSortHelper(jobs map[string]time.Duration) sortHelper {
slice := make([]string, 0, len(jobs))
for job := range jobs {
slice = append(slice, job)
}
return sortHelper{times: jobs, StringSlice: slice}
}
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