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|
package background
import (
"context"
"fmt"
"sync"
"github.com/mimecast/dtail/internal/io/logger"
)
type job struct {
cancel context.CancelFunc
done <-chan struct{}
}
type Background struct {
mutex sync.Mutex
jobs map[string]job
}
func NewBackground() *Background {
return &Background{
jobs: make(map[string]job),
}
}
func (b Background) Add(name string, cancel context.CancelFunc, done <-chan struct{}) error {
b.mutex.Lock()
defer b.mutex.Unlock()
if _, ok := b.jobs[name]; ok {
return fmt.Errorf("job '%s' already exists", name)
}
logger.Debug("background", name, "adding job")
b.jobs[name] = job{cancel, done}
return nil
}
func (b Background) get(name string) (job, bool) {
b.mutex.Lock()
defer b.mutex.Unlock()
job, ok := b.jobs[name]
return job, ok
}
func (b Background) delete(name string) {
b.mutex.Lock()
defer b.mutex.Unlock()
delete(b.jobs, name)
}
func (b Background) Stop(name string) {
logger.Debug("background", name, "stopping job")
job, ok := b.get(name)
if !ok {
logger.Debug("background", name, "no such job")
return
}
logger.Debug("background", name, "canceling job")
job.cancel()
logger.Debug("background", name, "waiting for job to complete")
<-job.done
logger.Debug("background", name, "deleting job")
b.delete(name)
}
|
