| /** |
| * 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 storm.trident.spout; |
| |
| import backtype.storm.Config; |
| import backtype.storm.task.TopologyContext; |
| import backtype.storm.topology.BasicOutputCollector; |
| import backtype.storm.topology.IBasicBolt; |
| import backtype.storm.topology.OutputFieldsDeclarer; |
| import storm.trident.topology.TransactionAttempt; |
| import backtype.storm.tuple.Fields; |
| import backtype.storm.tuple.Tuple; |
| import backtype.storm.tuple.Values; |
| import java.util.Map; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import storm.trident.topology.MasterBatchCoordinator; |
| import storm.trident.topology.state.RotatingTransactionalState; |
| import storm.trident.topology.state.TransactionalState; |
| |
| public class TridentSpoutCoordinator implements IBasicBolt { |
| public static final Logger LOG = LoggerFactory.getLogger(TridentSpoutCoordinator.class); |
| private static final String META_DIR = "meta"; |
| |
| ITridentSpout _spout; |
| ITridentSpout.BatchCoordinator _coord; |
| RotatingTransactionalState _state; |
| TransactionalState _underlyingState; |
| String _id; |
| |
| public TridentSpoutCoordinator(String id, ITridentSpout spout) { |
| _spout = spout; |
| _id = id; |
| } |
| |
| @Override |
| public void prepare(Map conf, TopologyContext context) { |
| _coord = _spout.getCoordinator(_id, conf, context); |
| _underlyingState = TransactionalState.newCoordinatorState(conf, _id); |
| _state = new RotatingTransactionalState(_underlyingState, META_DIR); |
| } |
| |
| @Override |
| public void execute(Tuple tuple, BasicOutputCollector collector) { |
| TransactionAttempt attempt = (TransactionAttempt) tuple.getValue(0); |
| |
| if (tuple.getSourceStreamId().equals(MasterBatchCoordinator.SUCCESS_STREAM_ID)) { |
| _state.cleanupBefore(attempt.getTransactionId()); |
| _coord.success(attempt.getTransactionId()); |
| } else { |
| long txid = attempt.getTransactionId(); |
| Object prevMeta = _state.getPreviousState(txid); |
| Object meta = _coord.initializeTransaction(txid, prevMeta, _state.getState(txid)); |
| _state.overrideState(txid, meta); |
| collector.emit(MasterBatchCoordinator.BATCH_STREAM_ID, new Values(attempt, meta)); |
| } |
| |
| } |
| |
| @Override |
| public void cleanup() { |
| _coord.close(); |
| _underlyingState.close(); |
| } |
| |
| @Override |
| public void declareOutputFields(OutputFieldsDeclarer declarer) { |
| declarer.declareStream(MasterBatchCoordinator.BATCH_STREAM_ID, new Fields("tx", "metadata")); |
| } |
| |
| @Override |
| public Map<String, Object> getComponentConfiguration() { |
| Config ret = new Config(); |
| ret.setMaxTaskParallelism(1); |
| return ret; |
| } |
| } |