package updater

// import (
// 	"github.com/tevino/abool"
// )

// type notifier struct {
// 	upgradeAvailable *abool.AtomicBool
// 	notifyChannel    chan struct{}
// }

// func newNotifier() *notifier {
// 	return &notifier{
// 		upgradeAvailable: abool.NewBool(false),
// 		notifyChannel:    make(chan struct{}),
// 	}
// }

// func (n *notifier) markAsUpgradeable() {
// 	if n.upgradeAvailable.SetToIf(false, true) {
// 		close(n.notifyChannel)
// 	}
// }

// // UpgradeAvailable returns whether an upgrade is available for this file.
// func (file *File) UpgradeAvailable() bool {
// 	return file.notifier.upgradeAvailable.IsSet()
// }

// // WaitForAvailableUpgrade blocks (selectable) until an upgrade for this file is available.
// func (file *File) WaitForAvailableUpgrade() <-chan struct{} {
// 	return file.notifier.notifyChannel
// }