Golang Job.Copy方法代碼示例

// deriveJob instantiates a new job based on the passed periodic job and the
// launch time.
func (p *PeriodicDispatch) deriveJob(periodicJob *structs.Job, time time.Time) (
	derived *structs.Job, err error) {

	// Have to recover in case the job copy panics.
	defer func() {
		if r := recover(); r != nil {
			p.logger.Printf("[ERR] nomad.periodic: deriving job from"+
				" periodic job %v failed; deregistering from periodic runner: %v",
				periodicJob.ID, r)
			p.Remove(periodicJob.ID)
			derived = nil
			err = fmt.Errorf("Failed to create a copy of the periodic job %v: %v", periodicJob.ID, r)
		}
	}()

	// Create a copy of the periodic job, give it a derived ID/Name and make it
	// non-periodic.
	derived = periodicJob.Copy()
	derived.ParentID = periodicJob.ID
	derived.ID = p.derivedJobID(periodicJob, time)
	derived.Name = derived.ID
	derived.Periodic = nil
	derived.GC = true
	return
}

// setJobStatus sets the status of the job by looking up associated evaluations
// and allocations. evalDelete should be set to true if setJobStatus is being
// called because an evaluation is being deleted (potentially because of garbage
// collection). If forceStatus is non-empty, the job's status will be set to the
// passed status.
func (s *StateStore) setJobStatus(index uint64, watcher watch.Items, txn *memdb.Txn,
	job *structs.Job, evalDelete bool, forceStatus string) error {

	// Capture the current status so we can check if there is a change
	oldStatus := job.Status
	newStatus := forceStatus

	// If forceStatus is not set, compute the jobs status.
	if forceStatus == "" {
		var err error
		newStatus, err = s.getJobStatus(txn, job, evalDelete)
		if err != nil {
			return err
		}
	}

	// Fast-path if nothing has changed.
	if oldStatus == newStatus {
		return nil
	}

	// The job has changed, so add to watcher.
	watcher.Add(watch.Item{Table: "jobs"})
	watcher.Add(watch.Item{Job: job.ID})

	// Copy and update the existing job
	updated := job.Copy()
	updated.Status = newStatus
	updated.ModifyIndex = index

	// Insert the job
	if err := txn.Insert("jobs", updated); err != nil {
		return fmt.Errorf("job insert failed: %v", err)
	}
	if err := txn.Insert("index", &IndexEntry{"jobs", index}); err != nil {
		return fmt.Errorf("index update failed: %v", err)
	}
	return nil
}