/**
* 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.ReducerAggregator;
import storm.trident.operation.TridentCollector;
import storm.trident.operation.TridentOperationContext;
import storm.trident.tuple.TridentTuple;
public class ReducerAggregatorImpl implements Aggregator<Result> {
ReducerAggregator _agg;
public ReducerAggregatorImpl(ReducerAggregator agg) {
_agg = agg;
}
public void prepare(Map conf, TridentOperationContext context) {
}
public Result init(Object batchId, TridentCollector collector) {
Result ret = new Result();
ret.obj = _agg.init();
return ret;
}
public void aggregate(Result val, TridentTuple tuple, TridentCollector collector) {
val.obj = _agg.reduce(val.obj, tuple);
}
public void complete(Result val, TridentCollector collector) {
collector.emit(new Values(val.obj));
}
public void cleanup() {
}
}