| /** |
| * 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.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Map.Entry; |
| import org.apache.storm.trident.operation.Aggregator; |
| import org.apache.storm.trident.operation.TridentCollector; |
| import org.apache.storm.trident.operation.TridentOperationContext; |
| import org.apache.storm.trident.tuple.ComboList; |
| import org.apache.storm.trident.tuple.TridentTuple; |
| import org.apache.storm.trident.tuple.TridentTupleView; |
| import org.apache.storm.trident.tuple.TridentTupleView.ProjectionFactory; |
| import org.apache.storm.tuple.Fields; |
| |
| public class GroupedAggregator implements Aggregator<Object[]> { |
| ProjectionFactory _groupFactory; |
| ProjectionFactory _inputFactory; |
| Aggregator _agg; |
| ComboList.Factory _fact; |
| Fields _inFields; |
| Fields _groupFields; |
| |
| public GroupedAggregator(Aggregator agg, Fields group, Fields input, int outSize) { |
| _groupFields = group; |
| _inFields = input; |
| _agg = agg; |
| int[] sizes = new int[2]; |
| sizes[0] = _groupFields.size(); |
| sizes[1] = outSize; |
| _fact = new ComboList.Factory(sizes); |
| } |
| |
| @Override |
| public void prepare(Map<String, Object> conf, TridentOperationContext context) { |
| _inputFactory = context.makeProjectionFactory(_inFields); |
| _groupFactory = context.makeProjectionFactory(_groupFields); |
| _agg.prepare(conf, new TridentOperationContext(context, _inputFactory)); |
| } |
| |
| @Override |
| public Object[] init(Object batchId, TridentCollector collector) { |
| return new Object[]{ new GroupCollector(collector, _fact), new HashMap(), batchId }; |
| } |
| |
| @Override |
| public void aggregate(Object[] arr, TridentTuple tuple, TridentCollector collector) { |
| GroupCollector groupColl = (GroupCollector) arr[0]; |
| Map<List, Object> val = (Map) arr[1]; |
| TridentTuple group = _groupFactory.create((TridentTupleView) tuple); |
| TridentTuple input = _inputFactory.create((TridentTupleView) tuple); |
| Object curr; |
| if (!val.containsKey(group)) { |
| curr = _agg.init(arr[2], groupColl); |
| val.put((List) group, curr); |
| } else { |
| curr = val.get(group); |
| } |
| groupColl.currGroup = group; |
| _agg.aggregate(curr, input, groupColl); |
| |
| } |
| |
| @Override |
| public void complete(Object[] arr, TridentCollector collector) { |
| Map<List, Object> val = (Map) arr[1]; |
| GroupCollector groupColl = (GroupCollector) arr[0]; |
| for (Entry<List, Object> e : val.entrySet()) { |
| groupColl.currGroup = e.getKey(); |
| _agg.complete(e.getValue(), groupColl); |
| } |
| } |
| |
| @Override |
| public void cleanup() { |
| _agg.cleanup(); |
| } |
| |
| } |