| /** |
| * 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.operation.impl; |
| |
| import backtype.storm.tuple.Fields; |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| import storm.trident.operation.GroupedMultiReducer; |
| import storm.trident.operation.MultiReducer; |
| import storm.trident.operation.TridentCollector; |
| import storm.trident.operation.TridentMultiReducerContext; |
| import storm.trident.tuple.TridentTuple; |
| import storm.trident.tuple.TridentTupleView.ProjectionFactory; |
| |
| public class GroupedMultiReducerExecutor implements MultiReducer<Map<TridentTuple, Object>> { |
| GroupedMultiReducer _reducer; |
| List<Fields> _groupFields; |
| List<Fields> _inputFields; |
| List<ProjectionFactory> _groupFactories = new ArrayList<ProjectionFactory>(); |
| List<ProjectionFactory> _inputFactories = new ArrayList<ProjectionFactory>(); |
| |
| public GroupedMultiReducerExecutor(GroupedMultiReducer reducer, List<Fields> groupFields, List<Fields> inputFields) { |
| if (inputFields.size() != groupFields.size()) { |
| throw new IllegalArgumentException("Multireducer groupFields and inputFields must be the same size"); |
| } |
| _groupFields = groupFields; |
| _inputFields = inputFields; |
| _reducer = reducer; |
| } |
| |
| @Override |
| public void prepare(Map conf, TridentMultiReducerContext context) { |
| for (int i = 0; i < _groupFields.size(); i++) { |
| _groupFactories.add(context.makeProjectionFactory(i, _groupFields.get(i))); |
| _inputFactories.add(context.makeProjectionFactory(i, _inputFields.get(i))); |
| } |
| _reducer.prepare(conf, new TridentMultiReducerContext((List) _inputFactories)); |
| } |
| |
| @Override |
| public Map<TridentTuple, Object> init(TridentCollector collector) { |
| return new HashMap(); |
| } |
| |
| @Override |
| public void execute(Map<TridentTuple, Object> state, int streamIndex, TridentTuple full, TridentCollector collector) { |
| ProjectionFactory groupFactory = _groupFactories.get(streamIndex); |
| ProjectionFactory inputFactory = _inputFactories.get(streamIndex); |
| |
| TridentTuple group = groupFactory.create(full); |
| TridentTuple input = inputFactory.create(full); |
| |
| Object curr; |
| if (!state.containsKey(group)) { |
| curr = _reducer.init(collector, group); |
| state.put(group, curr); |
| } else { |
| curr = state.get(group); |
| } |
| _reducer.execute(curr, streamIndex, group, input, collector); |
| } |
| |
| @Override |
| public void complete(Map<TridentTuple, Object> state, TridentCollector collector) { |
| for (Map.Entry e : state.entrySet()) { |
| TridentTuple group = (TridentTuple) e.getKey(); |
| Object val = e.getValue(); |
| _reducer.complete(val, group, collector); |
| } |
| } |
| |
| @Override |
| public void cleanup() { |
| _reducer.cleanup(); |
| } |
| |
| } |