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runner.go
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/
runner.go
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package job
import (
"context"
"sync"
"sync/atomic"
)
type Runner struct {
wg sync.WaitGroup
jobsCtx context.Context
jobsCancelFn context.CancelFunc
// blown tells if the runner has been used end-to-end (Go + StopAllJobs), or
// not. If blown, the runner can't be used anymore.
blown atomic.Bool
}
func (r *Runner) Ctx() context.Context {
return r.jobsCtx
}
func (r *Runner) Go(fn func(ctx context.Context)) {
if r.blown.Load() {
panic("the Runner cannot be recycled")
}
r.wg.Add(1)
go func() {
defer r.wg.Done()
fn(r.jobsCtx)
}()
}
func (r *Runner) StopAllJobs() {
r.blown.Store(true)
r.jobsCancelFn()
r.wg.Wait()
}
func NewRunner(ctx context.Context) *Runner {
jobsCtx, jobsCancelFn := context.WithCancel(ctx)
return &Runner{
blown: atomic.Bool{},
jobsCtx: jobsCtx,
jobsCancelFn: jobsCancelFn,
wg: sync.WaitGroup{},
}
}