| package backtype.storm.transactional; |
| |
| import backtype.storm.coordination.BatchOutputCollectorImpl; |
| import backtype.storm.task.OutputCollector; |
| import backtype.storm.task.TopologyContext; |
| import backtype.storm.topology.FailedException; |
| import backtype.storm.topology.IRichBolt; |
| import backtype.storm.topology.OutputFieldsDeclarer; |
| import backtype.storm.tuple.Tuple; |
| import java.math.BigInteger; |
| import java.util.Map; |
| import java.util.TreeMap; |
| import org.apache.log4j.Logger; |
| |
| public class TransactionalSpoutBatchExecutor implements IRichBolt { |
| public static Logger LOG = Logger.getLogger(TransactionalSpoutBatchExecutor.class); |
| |
| BatchOutputCollectorImpl _collector; |
| ITransactionalSpout _spout; |
| ITransactionalSpout.Emitter _emitter; |
| |
| TreeMap<BigInteger, TransactionAttempt> _activeTransactions = new TreeMap<BigInteger, TransactionAttempt>(); |
| |
| public TransactionalSpoutBatchExecutor(ITransactionalSpout spout) { |
| _spout = spout; |
| } |
| |
| @Override |
| public void prepare(Map conf, TopologyContext context, OutputCollector collector) { |
| _collector = new BatchOutputCollectorImpl(collector); |
| _emitter = _spout.getEmitter(conf, context); |
| } |
| |
| @Override |
| public void execute(Tuple input) { |
| TransactionAttempt attempt = (TransactionAttempt) input.getValue(0); |
| try { |
| if(input.getSourceStreamId().equals(TransactionalSpoutCoordinator.TRANSACTION_COMMIT_STREAM_ID)) { |
| if(attempt.equals(_activeTransactions.get(attempt.getTransactionId()))) { |
| ((ICommitterTransactionalSpout.Emitter) _emitter).commit(attempt); |
| _activeTransactions.remove(attempt.getTransactionId()); |
| _collector.ack(input); |
| } else { |
| _collector.fail(input); |
| } |
| } else { |
| _emitter.emitBatch(attempt, input.getValue(1), _collector); |
| _activeTransactions.put(attempt.getTransactionId(), attempt); |
| _collector.ack(input); |
| BigInteger committed = (BigInteger) input.getValue(2); |
| if(committed!=null) { |
| // valid to delete before what's been committed since |
| // those batches will never be accessed again |
| _activeTransactions.headMap(committed).clear(); |
| _emitter.cleanupBefore(committed); |
| } |
| } |
| } catch(FailedException e) { |
| LOG.warn("Failed to emit batch for transaction", e); |
| _collector.fail(input); |
| } |
| } |
| |
| @Override |
| public void cleanup() { |
| _emitter.close(); |
| } |
| |
| @Override |
| public void declareOutputFields(OutputFieldsDeclarer declarer) { |
| _spout.declareOutputFields(declarer); |
| } |
| |
| @Override |
| public Map<String, Object> getComponentConfiguration() { |
| return _spout.getComponentConfiguration(); |
| } |
| } |