| /** |
| * 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.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| import org.apache.storm.trident.operation.ReducerAggregator; |
| import org.apache.storm.trident.operation.TridentCollector; |
| import org.apache.storm.trident.operation.TridentOperationContext; |
| import org.apache.storm.trident.state.ReducerValueUpdater; |
| 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 MapReducerAggStateUpdater implements StateUpdater<MapState> { |
| //ANY CHANGE TO THIS CODE MUST BE SERIALIZABLE COMPATIBLE OR THERE WILL BE PROBLEMS |
| private static final long serialVersionUID = 8667174018978959987L; |
| |
| ReducerAggregator agg; |
| Fields groupFields; |
| Fields inputFields; |
| transient ProjectionFactory groupFactory; |
| transient ProjectionFactory inputFactory; |
| ComboList.Factory factory; |
| |
| public MapReducerAggStateUpdater(ReducerAggregator agg, Fields groupFields, Fields inputFields) { |
| this.agg = agg; |
| this.groupFields = groupFields; |
| this.inputFields = inputFields; |
| factory = new ComboList.Factory(groupFields.size(), 1); |
| } |
| |
| @Override |
| public void updateState(MapState map, List<TridentTuple> tuples, TridentCollector collector) { |
| Map<List<Object>, List<TridentTuple>> grouped = new HashMap<>(); |
| |
| for (TridentTuple t : tuples) { |
| List<Object> group = groupFactory.create(t); |
| List<TridentTuple> groupTuples = grouped.get(group); |
| if (groupTuples == null) { |
| groupTuples = new ArrayList<>(); |
| grouped.put(group, groupTuples); |
| } |
| groupTuples.add(inputFactory.create(t)); |
| } |
| List<List<Object>> uniqueGroups = new ArrayList<>(grouped.keySet()); |
| List<ValueUpdater> updaters = new ArrayList<>(uniqueGroups.size()); |
| for (List<Object> group : uniqueGroups) { |
| updaters.add(new ReducerValueUpdater(agg, grouped.get(group))); |
| } |
| List<Object> results = map.multiUpdate(uniqueGroups, updaters); |
| |
| for (int i = 0; i < uniqueGroups.size(); i++) { |
| List<Object> group = uniqueGroups.get(i); |
| Object result = results.get(i); |
| collector.emit(factory.create(new List[]{ group, 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() { |
| } |
| |
| } |