| /** |
| * 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.trident.spout; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.TreeMap; |
| import org.apache.storm.coordination.BatchOutputCollector; |
| import org.apache.storm.task.TopologyContext; |
| import org.apache.storm.topology.FailedException; |
| import org.apache.storm.topology.OutputFieldsDeclarer; |
| import org.apache.storm.trident.operation.TridentCollector; |
| import org.apache.storm.trident.topology.BatchInfo; |
| import org.apache.storm.trident.topology.ITridentBatchBolt; |
| import org.apache.storm.trident.topology.MasterBatchCoordinator; |
| import org.apache.storm.trident.topology.TransactionAttempt; |
| import org.apache.storm.trident.tuple.ConsList; |
| import org.apache.storm.tuple.Fields; |
| import org.apache.storm.tuple.Tuple; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class TridentSpoutExecutor implements ITridentBatchBolt { |
| public static final String ID_FIELD = "$tx"; |
| |
| public static final Logger LOG = LoggerFactory.getLogger(TridentSpoutExecutor.class); |
| |
| AddIdCollector collector; |
| ITridentSpout<Object> spout; |
| ITridentSpout.Emitter<Object> emitter; |
| String streamName; |
| String txStateId; |
| |
| TreeMap<Long, TransactionAttempt> activeBatches = new TreeMap<>(); |
| |
| public TridentSpoutExecutor(String txStateId, String streamName, ITridentSpout<Object> spout) { |
| this.txStateId = txStateId; |
| this.spout = spout; |
| this.streamName = streamName; |
| } |
| |
| @Override |
| public void prepare(Map<String, Object> conf, TopologyContext context, BatchOutputCollector collector) { |
| emitter = spout.getEmitter(txStateId, conf, context); |
| this.collector = new AddIdCollector(streamName, collector); |
| } |
| |
| @Override |
| public void execute(BatchInfo info, Tuple input) { |
| // there won't be a BatchInfo for the success stream |
| TransactionAttempt attempt = (TransactionAttempt) input.getValue(0); |
| if (input.getSourceStreamId().equals(MasterBatchCoordinator.COMMIT_STREAM_ID)) { |
| if (attempt.equals(activeBatches.get(attempt.getTransactionId()))) { |
| ((ICommitterTridentSpout.Emitter) emitter).commit(attempt); |
| activeBatches.remove(attempt.getTransactionId()); |
| } else { |
| throw new FailedException("Received commit for different transaction attempt"); |
| } |
| } else if (input.getSourceStreamId().equals(MasterBatchCoordinator.SUCCESS_STREAM_ID)) { |
| // valid to delete before what's been committed since |
| // those batches will never be accessed again |
| activeBatches.headMap(attempt.getTransactionId()).clear(); |
| emitter.success(attempt); |
| } else { |
| collector.setBatch(info.batchId); |
| emitter.emitBatch(attempt, input.getValue(1), collector); |
| activeBatches.put(attempt.getTransactionId(), attempt); |
| } |
| } |
| |
| @Override |
| public void cleanup() { |
| emitter.close(); |
| } |
| |
| @Override |
| public void declareOutputFields(OutputFieldsDeclarer declarer) { |
| List<String> fields = new ArrayList<>(spout.getOutputFields().toList()); |
| fields.add(0, ID_FIELD); |
| declarer.declareStream(streamName, new Fields(fields)); |
| } |
| |
| @Override |
| public Map<String, Object> getComponentConfiguration() { |
| return spout.getComponentConfiguration(); |
| } |
| |
| @Override |
| public void finishBatch(BatchInfo batchInfo) { |
| } |
| |
| @Override |
| public Object initBatchState(String batchGroup, Object batchId) { |
| return null; |
| } |
| |
| private static class AddIdCollector implements TridentCollector { |
| BatchOutputCollector delegate; |
| Object id; |
| String stream; |
| |
| AddIdCollector(String stream, BatchOutputCollector c) { |
| delegate = c; |
| this.stream = stream; |
| } |
| |
| |
| public void setBatch(Object id) { |
| this.id = id; |
| } |
| |
| @Override |
| public void emit(List<Object> values) { |
| delegate.emit(stream, new ConsList(id, values)); |
| } |
| |
| @Override |
| public void flush() { |
| delegate.flush(); |
| } |
| |
| @Override |
| public void reportError(Throwable t) { |
| delegate.reportError(t); |
| } |
| } |
| } |