org.apache.crunch.impl.spark.CounterAccumulatorParam.java Source code

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Here is the source code for org.apache.crunch.impl.spark.CounterAccumulatorParam.java

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/**
 * 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.crunch.impl.spark;

import com.google.common.collect.Maps;
import org.apache.spark.AccumulatorParam;

import java.util.Map;

public class CounterAccumulatorParam implements AccumulatorParam<Map<String, Map<String, Long>>> {
    @Override
    public Map<String, Map<String, Long>> addAccumulator(Map<String, Map<String, Long>> current,
            Map<String, Map<String, Long>> added) {
        for (Map.Entry<String, Map<String, Long>> e : added.entrySet()) {
            Map<String, Long> grp = current.get(e.getKey());
            if (grp == null) {
                grp = Maps.newTreeMap();
                current.put(e.getKey(), grp);
            }
            for (Map.Entry<String, Long> f : e.getValue().entrySet()) {
                Long cnt = grp.get(f.getKey());
                cnt = (cnt == null) ? f.getValue() : cnt + f.getValue();
                grp.put(f.getKey(), cnt);
            }
        }
        return current;
    }

    @Override
    public Map<String, Map<String, Long>> addInPlace(Map<String, Map<String, Long>> first,
            Map<String, Map<String, Long>> second) {
        return addAccumulator(first, second);
    }

    @Override
    public Map<String, Map<String, Long>> zero(Map<String, Map<String, Long>> counts) {
        return Maps.newHashMap();
    }
}