updater

type Controller interface {
	// Run has the Controller execute all the Updaters passed on the channel,
	// until it's closed. The method runs synchronously and only returns after
	// the channel is closed or the context is canceled.
	//
	// Any spawned goroutines should inherit the passed-in Context.
	//
	// A call to Run should be thought of as one execution of the Updaters.
	// If a caller wants to call Run in a loop, it should use a new channel on
	// each iteration.
	Run(context.Context, <-chan driver.Updater) error
}