| /** |
| * 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 backtype.storm.transactional.partitioned; |
| |
| import backtype.storm.Config; |
| import backtype.storm.task.TopologyContext; |
| import backtype.storm.topology.OutputFieldsDeclarer; |
| import backtype.storm.transactional.ITransactionalSpout; |
| import backtype.storm.transactional.TransactionAttempt; |
| import backtype.storm.coordination.BatchOutputCollector; |
| import backtype.storm.transactional.state.RotatingTransactionalState; |
| import backtype.storm.transactional.state.TransactionalState; |
| import java.math.BigInteger; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| |
| public class PartitionedTransactionalSpoutExecutor implements ITransactionalSpout<Integer> { |
| IPartitionedTransactionalSpout _spout; |
| |
| public PartitionedTransactionalSpoutExecutor(IPartitionedTransactionalSpout spout) { |
| _spout = spout; |
| } |
| |
| public IPartitionedTransactionalSpout getPartitionedSpout() { |
| return _spout; |
| } |
| |
| class Coordinator implements ITransactionalSpout.Coordinator<Integer> { |
| private IPartitionedTransactionalSpout.Coordinator _coordinator; |
| |
| public Coordinator(Map conf, TopologyContext context) { |
| _coordinator = _spout.getCoordinator(conf, context); |
| } |
| |
| @Override |
| public Integer initializeTransaction(BigInteger txid, Integer prevMetadata) { |
| return _coordinator.numPartitions(); |
| } |
| |
| @Override |
| public boolean isReady() { |
| return _coordinator.isReady(); |
| } |
| |
| @Override |
| public void close() { |
| _coordinator.close(); |
| } |
| } |
| |
| class Emitter implements ITransactionalSpout.Emitter<Integer> { |
| private IPartitionedTransactionalSpout.Emitter _emitter; |
| private TransactionalState _state; |
| private Map<Integer, RotatingTransactionalState> _partitionStates = new HashMap<Integer, RotatingTransactionalState>(); |
| private int _index; |
| private int _numTasks; |
| |
| public Emitter(Map conf, TopologyContext context) { |
| _emitter = _spout.getEmitter(conf, context); |
| _state = TransactionalState.newUserState(conf, (String) conf.get(Config.TOPOLOGY_TRANSACTIONAL_ID), getComponentConfiguration()); |
| _index = context.getThisTaskIndex(); |
| _numTasks = context.getComponentTasks(context.getThisComponentId()).size(); |
| } |
| |
| @Override |
| public void emitBatch(final TransactionAttempt tx, final Integer partitions, |
| final BatchOutputCollector collector) { |
| for(int i=_index; i < partitions; i+=_numTasks) { |
| if(!_partitionStates.containsKey(i)) { |
| _partitionStates.put(i, new RotatingTransactionalState(_state, "" + i)); |
| } |
| RotatingTransactionalState state = _partitionStates.get(i); |
| final int partition = i; |
| Object meta = state.getStateOrCreate(tx.getTransactionId(), |
| new RotatingTransactionalState.StateInitializer() { |
| @Override |
| public Object init(BigInteger txid, Object lastState) { |
| return _emitter.emitPartitionBatchNew(tx, collector, partition, lastState); |
| } |
| }); |
| // it's null if one of: |
| // a) a later transaction batch was emitted before this, so we should skip this batch |
| // b) if didn't exist and was created (in which case the StateInitializer was invoked and |
| // it was emitted |
| if(meta!=null) { |
| _emitter.emitPartitionBatch(tx, collector, partition, meta); |
| } |
| } |
| |
| } |
| |
| @Override |
| public void cleanupBefore(BigInteger txid) { |
| for(RotatingTransactionalState state: _partitionStates.values()) { |
| state.cleanupBefore(txid); |
| } |
| } |
| |
| @Override |
| public void close() { |
| _state.close(); |
| _emitter.close(); |
| } |
| } |
| |
| @Override |
| public ITransactionalSpout.Coordinator getCoordinator(Map conf, TopologyContext context) { |
| return new Coordinator(conf, context); |
| } |
| |
| @Override |
| public ITransactionalSpout.Emitter getEmitter(Map conf, TopologyContext context) { |
| return new Emitter(conf, context); |
| } |
| |
| @Override |
| public void declareOutputFields(OutputFieldsDeclarer declarer) { |
| _spout.declareOutputFields(declarer); |
| } |
| |
| @Override |
| public Map<String, Object> getComponentConfiguration() { |
| return _spout.getComponentConfiguration(); |
| } |
| |
| } |