storm-client/src/jvm/org/apache/storm/trident/testing/CountAsAggregator.java

/**
 * 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.testing;

import org.apache.storm.trident.operation.BaseAggregator;
import org.apache.storm.trident.operation.TridentCollector;
import org.apache.storm.trident.tuple.TridentTuple;
import org.apache.storm.tuple.Values;


public class CountAsAggregator extends BaseAggregator<CountAsAggregator.State> {

    @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));
    }

    static class State {
        long count = 0;
    }

}