| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.heron.examples |
| import java.util |
| |
| import backtype.storm.metric.api.{MeanReducer, MultiCountMetric, MultiReducedMetric} |
| import backtype.storm.task.TopologyContext |
| import backtype.storm.topology.{BasicOutputCollector, OutputFieldsDeclarer} |
| import backtype.storm.topology.base.BaseBasicBolt |
| import backtype.storm.tuple.Tuple |
| |
| /** |
| * This is an example of a bolt that has some patterns that might be in use in scala that is |
| * compatible with the Storm API. It will run on both Storm and Heron. |
| */ |
| class SomeStormBolt extends BaseBasicBolt { |
| |
| var countMetrics: MultiCountMetric = _ |
| var reducedMetrics: MultiReducedMetric = _ |
| |
| override def prepare(stormConf: util.Map[_,_], context: TopologyContext): Unit = { |
| super.prepare(stormConf, context) |
| countMetrics = new MultiCountMetric |
| reducedMetrics = new MultiReducedMetric(new MeanReducer) |
| context.registerMetric("countmetrics", countMetrics, 60) |
| context.registerMetric("avgmetrics", reducedMetrics, 60) |
| } |
| |
| override def execute(tuple:Tuple, collector: BasicOutputCollector): Unit = { |
| tuple getValue 1 match { |
| case str: String if str.trim.nonEmpty => |
| SomethingThatDoesStuff.doStuff(str, reducedMetrics) |
| case _ => |
| countMetrics scope "unexpected_input" incr() |
| } |
| } |
| |
| override def declareOutputFields(declarer: OutputFieldsDeclarer): Unit = {} |
| } |
| |
| object SomethingThatDoesStuff { |
| |
| def doStuff(str:String, metric:MultiReducedMetric): Unit ={ |
| // Do something with String |
| |
| // Update metrics |
| metric scope "some_avg" update 10 |
| } |
| } |