/**
* 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.testing;
import backtype.storm.tuple.Values;
import storm.trident.operation.BaseAggregator;
import storm.trident.operation.TridentCollector;
import storm.trident.tuple.TridentTuple;
public class CountAsAggregator extends BaseAggregator<CountAsAggregator.State> {
static class State {
long count = 0;
}
@Override
public State init(Object batchId, TridentCollector collector) {
return new State();
}
@Override
public void aggregate(State state, TridentTuple tuple, TridentCollector collector) {
state.count++;
}
@Override
public void complete(State state, TridentCollector collector) {
collector.emit(new Values(state.count));
}
}