| /** |
| * 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 storm.trident.state.map; |
| |
| import backtype.storm.tuple.Fields; |
| import backtype.storm.tuple.Values; |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| import storm.trident.operation.ReducerAggregator; |
| import storm.trident.operation.TridentCollector; |
| import storm.trident.operation.TridentOperationContext; |
| import storm.trident.state.ReducerValueUpdater; |
| import storm.trident.state.StateUpdater; |
| import storm.trident.state.ValueUpdater; |
| import storm.trident.tuple.ComboList; |
| import storm.trident.tuple.TridentTuple; |
| import storm.trident.tuple.TridentTupleView.ProjectionFactory; |
| |
| public class MapReducerAggStateUpdater implements StateUpdater<MapState> { |
| ReducerAggregator _agg; |
| Fields _groupFields; |
| Fields _inputFields; |
| ProjectionFactory _groupFactory; |
| ProjectionFactory _inputFactory; |
| ComboList.Factory _factory; |
| |
| public MapReducerAggStateUpdater(ReducerAggregator agg, Fields groupFields, Fields inputFields) { |
| _agg = agg; |
| _groupFields = groupFields; |
| _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(); |
| |
| List<List<Object>> groups = new ArrayList<List<Object>>(tuples.size()); |
| List<Object> values = new ArrayList<Object>(tuples.size()); |
| 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 conf, TridentOperationContext context) { |
| _groupFactory = context.makeProjectionFactory(_groupFields); |
| _inputFactory = context.makeProjectionFactory(_inputFields); |
| } |
| |
| @Override |
| public void cleanup() { |
| } |
| |
| } |