/**
* 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 com.jstorm.example.unittests.window;
import backtype.storm.task.OutputCollector;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.topology.base.BaseRichBolt;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Tuple;
import backtype.storm.tuple.Values;
import java.util.HashMap;
import java.util.Map;
/**
* @author binyang.dby on 2016/7/22.
*/
public class WindowTestCountAggBolt extends BaseRichBolt {
// Mapping of key->upstreamBolt->count
private Map<Object, Map<Integer, Long>> counts = new HashMap<Object, Map<Integer, Long>>();
private OutputCollector collector;
@Override
public void prepare(Map stormConf, TopologyContext context, OutputCollector collector) {
this.collector = collector;
}
@Override
public void execute(Tuple input) {
Object obj = input.getValue(0);
long count = input.getLong(1);
int source = input.getSourceTask();
System.out.println("### obj = " + obj + " count = " + count + " src = " + source);
Map<Integer, Long> subCounts = counts.get(obj);
if (subCounts == null) {
subCounts = new HashMap<Integer, Long>();
counts.put(obj, subCounts);
}
// Update the current count for this object
subCounts.put(source, count);
// Output the sum of all the known counts so for this key
long sum = 0;
for (Long val : subCounts.values()) {
sum += val;
}
collector.emit(new Values(obj, sum));
}
@Override
public void declareOutputFields(OutputFieldsDeclarer declarer) {
declarer.declare(new Fields("obj", "count"));
}
}