简单介绍
可以在JStorm的控制台看见。
和常见的java metrics系统一样,支持
- Counter:累计值
- Gauge:瞬时值
- Histogram:瞬时值的分布
使用
public class MyBolt extends BaseBasicBolt {
private MetricClient metricClient;
private AsmCounter myCounter;
@Override
public void prepare(Map stormConf, TopologyContext context) {
metricClient = new MetricClient(context);
myCounter = metricClient.registerCounter("myCounter");
}
public void execute(Tuple input, BasicOutputCollector collector) {
Object value = input.getValueByField("value");
myCounter.inc();
if(value instanceof UmetripEvent){
System.out.println("RECEIVE");
UmetripEvent event = (UmetripEvent)value;
}
//throw new FailedException("manual fail");
}
public void declareOutputFields(OutputFieldsDeclarer declarer) {
declarer.declare(new Fields("EVENT"));
}
}