question: @ Override public List < AlarmModelDescriptor > alarmModels ( ) { List < AlarmModelDescriptor > descriptors = new ArrayList < AlarmModelDescriptor > ( ) ; for ( ServiceReference < AlarmModel > model : models ) { descriptors . add ( model . metaInfo ( AlarmModelDescriptor . class ) ) ; } return descriptors ; }
target:  Returns all the AlarmModels that has been installed.