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KairosDB is a time series database that stores numeric values along with key/value tags to a nosql data store. Currently supported backends are Cassandra and H2. An H2 implementation is provided for development work.

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package org.kairosdb.util;

import java.util.HashMap;

public class SummingMap extends HashMap
{
    @Override
    public Long put(String key, Long value)
    {
        if (super.containsKey(key)) {
            Long sum = super.get(key);
            sum += value;
            return super.put(key, sum);
        }
        else
        {
            return super.put(key, value);
        }
    }

    public String getKeyForSmallestValue()
    {
        Long smallest = Long.MAX_VALUE;
        String smallestKey = null;
        for (Entry entry : super.entrySet()) {
            if (entry.getValue() < smallest)
            {
                smallest = entry.getValue();
                smallestKey = entry.getKey();
            }
        }

        return smallestKey;
    }
}