in tormenta-twitter/src/main/scala/com/twitter/tormenta/spout/TwitterSpout.scala [70:77]
override def open(conf: JMap[_, _], context: TopologyContext, coll: SpoutOutputCollector) {
collector = coll
stream = factory.getInstance
stream.addListener(listener)
// TODO: Add support beyond "sample". (GardenHose, for example.)
stream.sample
}