func newRelationUnitsWatcher(
relationId int,
in apiwatcher.RelationUnitsWatcher,
out chan<- relationUnitsChange,
) *relationUnitsWatcher {
ruw := &relationUnitsWatcher{relationId: relationId, in: in, out: out}
go func() {
defer ruw.tomb.Done()
// TODO(axw) add Kill() and Wait() to watchers?
//
// At the moment we have to rely on the watcher's
// channel being closed inside loop() to react
// to it being killed/stopped.
ruw.tomb.Kill(ruw.loop())
ruw.tomb.Kill(in.Stop())
}()
return ruw
}
