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scheduler.go
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scheduler.go
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package scheduler
import (
"sync"
"time"
"code.cloudfoundry.org/lager"
"github.com/concourse/atc"
"github.com/concourse/atc/db"
"github.com/concourse/atc/db/algorithm"
"github.com/concourse/atc/scheduler/inputmapper"
)
type Scheduler struct {
Pipeline db.Pipeline
InputMapper inputmapper.InputMapper
BuildStarter BuildStarter
Scanner Scanner
}
//go:generate counterfeiter . Scanner
type Scanner interface {
Scan(lager.Logger, string) error
}
func (s *Scheduler) Schedule(
logger lager.Logger,
versions *algorithm.VersionsDB,
jobs []db.Job,
resources db.Resources,
resourceTypes atc.VersionedResourceTypes,
) (map[string]time.Duration, error) {
jobSchedulingTime := map[string]time.Duration{}
for _, job := range jobs {
jStart := time.Now()
err := s.ensurePendingBuildExists(logger, versions, job)
jobSchedulingTime[job.Name()] = time.Since(jStart)
if err != nil {
return jobSchedulingTime, err
}
}
nextPendingBuilds, err := s.Pipeline.GetAllPendingBuilds()
if err != nil {
logger.Error("failed-to-get-all-next-pending-builds", err)
return jobSchedulingTime, err
}
for _, job := range jobs {
jStart := time.Now()
nextPendingBuildsForJob, ok := nextPendingBuilds[job.Name()]
if !ok {
continue
}
err := s.BuildStarter.TryStartPendingBuildsForJob(logger, job, resources, resourceTypes, nextPendingBuildsForJob)
jobSchedulingTime[job.Name()] = jobSchedulingTime[job.Name()] + time.Since(jStart)
if err != nil {
return jobSchedulingTime, err
}
}
return jobSchedulingTime, nil
}
func (s *Scheduler) ensurePendingBuildExists(
logger lager.Logger,
versions *algorithm.VersionsDB,
job db.Job,
) error {
inputMapping, err := s.InputMapper.SaveNextInputMapping(logger, versions, job)
if err != nil {
return err
}
for _, inputConfig := range job.Config().Inputs() {
inputVersion, ok := inputMapping[inputConfig.Name]
//trigger: true, and the version has not been used
if ok && inputVersion.FirstOccurrence && inputConfig.Trigger {
err := job.EnsurePendingBuildExists()
if err != nil {
logger.Error("failed-to-ensure-pending-build-exists", err)
return err
}
break
}
}
return nil
}
type Waiter interface {
Wait()
}
func (s *Scheduler) TriggerImmediately(
logger lager.Logger,
job db.Job,
resources db.Resources,
resourceTypes atc.VersionedResourceTypes,
) (db.Build, Waiter, error) {
logger = logger.Session("trigger-immediately", lager.Data{"job_name": job.Name()})
build, err := job.CreateBuild()
if err != nil {
logger.Error("failed-to-create-job-build", err)
return nil, nil, err
}
wg := new(sync.WaitGroup)
wg.Add(1)
go func() {
defer wg.Done()
nextPendingBuilds, err := job.GetPendingBuilds()
if err != nil {
logger.Error("failed-to-get-next-pending-build-for-job", err)
return
}
err = s.BuildStarter.TryStartPendingBuildsForJob(logger, job, resources, resourceTypes, nextPendingBuilds)
if err != nil {
logger.Error("failed-to-start-next-pending-build-for-job", err, lager.Data{"job-name": job.Name()})
return
}
}()
return build, wg, nil
}
func (s *Scheduler) SaveNextInputMapping(logger lager.Logger, job db.Job) error {
versions, err := s.Pipeline.LoadVersionsDB()
if err != nil {
logger.Error("failed-to-load-versions-db", err)
return err
}
_, err = s.InputMapper.SaveNextInputMapping(logger, versions, job)
return err
}