| /** |
| * 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.operation.impl; |
| |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| import org.apache.storm.trident.operation.GroupedMultiReducer; |
| import org.apache.storm.trident.operation.MultiReducer; |
| import org.apache.storm.trident.operation.TridentCollector; |
| import org.apache.storm.trident.operation.TridentMultiReducerContext; |
| import org.apache.storm.trident.tuple.TridentTuple; |
| import org.apache.storm.trident.tuple.TridentTupleView.ProjectionFactory; |
| import org.apache.storm.tuple.Fields; |
| |
| |
| 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"); |
| } |
| this.groupFields = groupFields; |
| this.inputFields = inputFields; |
| this.reducer = reducer; |
| } |
| |
| @Override |
| public void prepare(Map<String, Object> 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(); |
| } |
| |
| } |