| /** |
| * 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.planner.processor; |
| |
| import java.util.List; |
| import java.util.Map; |
| import org.apache.storm.task.TopologyContext; |
| import org.apache.storm.trident.operation.FlatMapFunction; |
| import org.apache.storm.trident.operation.Function; |
| import org.apache.storm.trident.operation.MapFunction; |
| import org.apache.storm.trident.operation.TridentOperationContext; |
| import org.apache.storm.trident.planner.ProcessorContext; |
| import org.apache.storm.trident.planner.TridentProcessor; |
| import org.apache.storm.trident.tuple.TridentTuple; |
| import org.apache.storm.trident.tuple.TridentTupleView; |
| import org.apache.storm.tuple.Fields; |
| |
| /** |
| * Processor for executing {@link org.apache.storm.trident.Stream#map(MapFunction)} and |
| * {@link org.apache.storm.trident.Stream#flatMap(FlatMapFunction)} |
| * functions. |
| */ |
| public class MapProcessor implements TridentProcessor { |
| Function function; |
| TridentContext context; |
| FreshCollector collector; |
| Fields inputFields; |
| TridentTupleView.ProjectionFactory projection; |
| |
| public MapProcessor(Fields inputFields, Function function) { |
| this.function = function; |
| this.inputFields = inputFields; |
| } |
| |
| @Override |
| public void prepare(Map<String, Object> conf, TopologyContext context, TridentContext tridentContext) { |
| List<TridentTuple.Factory> parents = tridentContext.getParentTupleFactories(); |
| if (parents.size() != 1) { |
| throw new RuntimeException("Map operation can only have one parent"); |
| } |
| this.context = tridentContext; |
| collector = new FreshCollector(tridentContext); |
| projection = new TridentTupleView.ProjectionFactory(parents.get(0), inputFields); |
| function.prepare(conf, new TridentOperationContext(context, projection)); |
| } |
| |
| @Override |
| public void cleanup() { |
| function.cleanup(); |
| } |
| |
| @Override |
| public void execute(ProcessorContext processorContext, String streamId, TridentTuple tuple) { |
| collector.setContext(processorContext); |
| function.execute(projection.create(tuple), collector); |
| } |
| |
| @Override |
| public void flush() { |
| collector.flush(); |
| } |
| |
| @Override |
| public void startBatch(ProcessorContext processorContext) { |
| // NOOP |
| } |
| |
| @Override |
| public void finishBatch(ProcessorContext processorContext) { |
| // NOOP |
| } |
| |
| @Override |
| public TridentTuple.Factory getOutputFactory() { |
| return collector.getOutputFactory(); |
| } |
| } |