blob: 99b355cda4df24318bafd4fe72dc1e71f3560173 [file] [log] [blame]
/*
* Copyright 2018 The Apache Software Foundation.
*
* Licensed 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.storm.integration;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.apache.storm.task.OutputCollector;
import org.apache.storm.task.TopologyContext;
import org.apache.storm.topology.OutputFieldsDeclarer;
import org.apache.storm.topology.base.BaseRichBolt;
import org.apache.storm.tuple.Fields;
import org.apache.storm.tuple.Tuple;
import org.apache.storm.tuple.Values;
class AggBolt extends BaseRichBolt {
private final int branches;
private final List<Tuple> seen = new ArrayList<>();
private OutputCollector collector;
public AggBolt(int branches) {
this.branches = branches;
}
@Override
public void declareOutputFields(OutputFieldsDeclarer declarer) {
declarer.declare(new Fields("num"));
}
@Override
public void prepare(Map<String, Object> topoConf, TopologyContext context, OutputCollector collector) {
this.collector = collector;
}
@Override
public void execute(Tuple input) {
seen.add(input);
if (seen.size() == branches) {
collector.emit(seen, new Values(1));
seen.forEach(t -> collector.ack(t));
seen.clear();
}
}
}