| /** |
| * 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.Values; |
| import java.util.Map; |
| import storm.trident.operation.Aggregator; |
| import storm.trident.operation.CombinerAggregator; |
| import storm.trident.operation.TridentCollector; |
| import storm.trident.operation.TridentOperationContext; |
| import storm.trident.tuple.TridentTuple; |
| |
| public class CombinerAggregatorCombineImpl implements Aggregator<Result> { |
| CombinerAggregator _agg; |
| |
| public CombinerAggregatorCombineImpl(CombinerAggregator agg) { |
| _agg = agg; |
| } |
| |
| public void prepare(Map conf, TridentOperationContext context) { |
| |
| } |
| |
| public Result init(Object batchId, TridentCollector collector) { |
| Result ret = new Result(); |
| ret.obj = _agg.zero(); |
| return ret; |
| } |
| |
| public void aggregate(Result val, TridentTuple tuple, TridentCollector collector) { |
| Object v = tuple.getValue(0); |
| if (val.obj == null) { |
| val.obj = v; |
| } else { |
| val.obj = _agg.combine(val.obj, v); |
| } |
| } |
| |
| public void complete(Result val, TridentCollector collector) { |
| collector.emit(new Values(val.obj)); |
| } |
| |
| public void cleanup() { |
| |
| } |
| } |