| package backtype.storm.task; |
| |
| import backtype.storm.task.CoordinatedBolt.FinishedCallback; |
| import backtype.storm.topology.IRichBolt; |
| import backtype.storm.topology.OutputFieldsDeclarer; |
| import backtype.storm.tuple.Tuple; |
| import backtype.storm.utils.KeyedRoundRobinQueue; |
| import java.util.Map; |
| |
| |
| public class KeyedFairBolt implements IRichBolt, FinishedCallback { |
| IRichBolt _delegate; |
| KeyedRoundRobinQueue<Tuple> _rrQueue; |
| Thread _executor; |
| FinishedCallback _callback; |
| |
| public KeyedFairBolt(IRichBolt delegate) { |
| _delegate = delegate; |
| } |
| |
| public void prepare(Map stormConf, TopologyContext context, OutputCollector collector) { |
| if(_delegate instanceof FinishedCallback) { |
| _callback = (FinishedCallback) _delegate; |
| } |
| _delegate.prepare(stormConf, context, collector); |
| _rrQueue = new KeyedRoundRobinQueue<Tuple>(); |
| _executor = new Thread(new Runnable() { |
| public void run() { |
| try { |
| while(true) { |
| _delegate.execute(_rrQueue.take()); |
| } |
| } catch (InterruptedException e) { |
| |
| } |
| } |
| }); |
| _executor.setDaemon(true); |
| _executor.start(); |
| } |
| |
| public void execute(Tuple input) { |
| Object key = input.getValue(0); |
| _rrQueue.add(key, input); |
| } |
| |
| public void cleanup() { |
| _executor.interrupt(); |
| _delegate.cleanup(); |
| } |
| |
| public void declareOutputFields(OutputFieldsDeclarer declarer) { |
| _delegate.declareOutputFields(declarer); |
| } |
| |
| public void finishedId(Object id) { |
| if(_callback!=null) { |
| _callback.finishedId(id); |
| } |
| } |
| } |