| /** |
| * 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.storm.drpc; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| import org.apache.storm.coordination.CoordinatedBolt.FinishedCallback; |
| import org.apache.storm.task.OutputCollector; |
| import org.apache.storm.task.TopologyContext; |
| import org.apache.storm.topology.BasicBoltExecutor; |
| import org.apache.storm.topology.IBasicBolt; |
| import org.apache.storm.topology.IRichBolt; |
| import org.apache.storm.topology.OutputFieldsDeclarer; |
| import org.apache.storm.tuple.Tuple; |
| import org.apache.storm.utils.KeyedRoundRobinQueue; |
| |
| |
| public class KeyedFairBolt implements IRichBolt, FinishedCallback { |
| IRichBolt delegate; |
| KeyedRoundRobinQueue<Tuple> rrQueue; |
| Thread executor; |
| FinishedCallback callback; |
| |
| public KeyedFairBolt(IRichBolt delegate) { |
| this.delegate = delegate; |
| } |
| |
| public KeyedFairBolt(IBasicBolt delegate) { |
| this(new BasicBoltExecutor(delegate)); |
| } |
| |
| @Override |
| public void prepare(Map<String, Object> topoConf, TopologyContext context, OutputCollector collector) { |
| if (delegate instanceof FinishedCallback) { |
| callback = (FinishedCallback) delegate; |
| } |
| delegate.prepare(topoConf, context, collector); |
| rrQueue = new KeyedRoundRobinQueue<Tuple>(); |
| executor = new Thread(new Runnable() { |
| @Override |
| public void run() { |
| try { |
| while (true) { |
| delegate.execute(rrQueue.take()); |
| } |
| } catch (InterruptedException e) { |
| //ignore |
| } |
| } |
| }); |
| executor.setDaemon(true); |
| executor.start(); |
| } |
| |
| @Override |
| public void execute(Tuple input) { |
| Object key = input.getValue(0); |
| rrQueue.add(key, input); |
| } |
| |
| @Override |
| public void cleanup() { |
| executor.interrupt(); |
| delegate.cleanup(); |
| } |
| |
| @Override |
| public void declareOutputFields(OutputFieldsDeclarer declarer) { |
| delegate.declareOutputFields(declarer); |
| } |
| |
| @Override |
| public void finishedId(Object id) { |
| if (callback != null) { |
| callback.finishedId(id); |
| } |
| } |
| |
| @Override |
| public Map<String, Object> getComponentConfiguration() { |
| return new HashMap<String, Object>(); |
| } |
| } |