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Splout SQL is a read only, horizontally scalable and partitioned SQL database that plays well with Hadoop.

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package com.splout.db.benchmark;

/*
 * #%L
 * Splout SQL Server
 * %%
 * Copyright (C) 2012 Datasalt Systems S.L.
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see .
 * #L%
 */

/**
 * A simple tool that can measure the performance of queries using {@link HistogramWithStats}.
 */
public class PerformanceTool {

	private HistogramWithStats histogram;
	private ThreadLocal startTime = new ThreadLocal() {
		protected Long initialValue() {
			return System.currentTimeMillis();
		};
	};
	
	public PerformanceTool() {
		histogram = new HistogramWithStats();
	}
	
	public void startQuery() {
		startTime.set(System.currentTimeMillis());
	}
	
	public long endQuery() {
		long time = System.currentTimeMillis() - startTime.get();
		histogram.add(time);
		return time;
	}
	
	public int getNQueries() {
		return (int) histogram.getCount();
	}
	
	public double getAverage() {
		return histogram.getAverage();
	}
	
	public HistogramWithStats getHistogram() {
		return histogram;
	}
}