| /** |
| * 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.state.map; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| import org.apache.storm.trident.operation.CombinerAggregator; |
| import org.apache.storm.trident.operation.TridentCollector; |
| import org.apache.storm.trident.operation.TridentOperationContext; |
| import org.apache.storm.trident.state.CombinerValueUpdater; |
| import org.apache.storm.trident.state.StateUpdater; |
| import org.apache.storm.trident.state.ValueUpdater; |
| import org.apache.storm.trident.tuple.ComboList; |
| import org.apache.storm.trident.tuple.TridentTuple; |
| import org.apache.storm.trident.tuple.TridentTupleView.ProjectionFactory; |
| import org.apache.storm.tuple.Fields; |
| import org.apache.storm.tuple.Values; |
| |
| public class MapCombinerAggStateUpdater implements StateUpdater<MapState> { |
| //ANY CHANGE TO THIS CODE MUST BE SERIALIZABLE COMPATIBLE OR THERE WILL BE PROBLEMS |
| private static final long serialVersionUID = -3960578785572592092L; |
| |
| CombinerAggregator agg; |
| Fields groupFields; |
| Fields inputFields; |
| transient ProjectionFactory groupFactory; |
| transient ProjectionFactory inputFactory; |
| ComboList.Factory factory; |
| |
| public MapCombinerAggStateUpdater(CombinerAggregator agg, Fields groupFields, Fields inputFields) { |
| this.agg = agg; |
| this.groupFields = groupFields; |
| this.inputFields = inputFields; |
| if (inputFields.size() != 1) { |
| throw new IllegalArgumentException( |
| "Combiner aggs only take a single field as input. Got this instead: " + inputFields.toString()); |
| } |
| factory = new ComboList.Factory(groupFields.size(), inputFields.size()); |
| } |
| |
| @Override |
| public void updateState(MapState map, List<TridentTuple> tuples, TridentCollector collector) { |
| List<List<Object>> groups = new ArrayList<List<Object>>(tuples.size()); |
| List<ValueUpdater> updaters = new ArrayList<ValueUpdater>(tuples.size()); |
| |
| for (TridentTuple t : tuples) { |
| groups.add(groupFactory.create(t)); |
| updaters.add(new CombinerValueUpdater(agg, inputFactory.create(t).getValue(0))); |
| } |
| List<Object> newVals = map.multiUpdate(groups, updaters); |
| |
| for (int i = 0; i < tuples.size(); i++) { |
| List<Object> key = groups.get(i); |
| Object result = newVals.get(i); |
| collector.emit(factory.create(new List[]{ key, new Values(result) })); |
| } |
| } |
| |
| @Override |
| public void prepare(Map<String, Object> conf, TridentOperationContext context) { |
| groupFactory = context.makeProjectionFactory(groupFields); |
| inputFactory = context.makeProjectionFactory(inputFields); |
| } |
| |
| @Override |
| public void cleanup() { |
| } |
| |
| } |