我正在使用[codahale-metrics]獲取Storm的螺栓和噴嘴的指標(biāo)，并發(fā)送到Graphite服務(wù)器。我如何有時(shí)間在螺栓和噴嘴之間發(fā)送消息？例如。此代碼僅用于每個(gè)執(zhí)行器上的指標(biāo)：import com.codahale.metrics.Histogram;import com.codahale.metrics.Meter;import com.codahale.metrics.Timer;public class MqttSensorDetailSpout extends BaseRichSpout {    private Meter tupleMeter;    private Timer tupleTimer;    private Histogram tupleHistogram;    public void open(Map conf, TopologyContext context, SpoutOutputCollector collector) {        this.context = context;        this.collector = collector;        this.tupleMeter = context.registerMeter("meterSpout-" + this.topic);        this.tupleTimer = context.registerTimer("timerSpout-" + this.topic);        this.tupleHistogram = context.registerHistogram("histogramSpout-" + this.topic);    }    public void nextTuple() {        final Timer.Context timeContext = this.tupleTimer.time();        this.tupleMeter.mark();        try {        …        } finally {            timeContext.stop();        }    }}我想知道在執(zhí)行器之間發(fā)送消息所經(jīng)過的時(shí)間。我將如何實(shí)現(xiàn)它？謝謝，費(fèi)利佩