package org.red5.server.api.statistics.support;

/*
 * RED5 Open Source Flash Server - http://code.google.com/p/red5/
 * 
 * Copyright (c) 2006-2010 by respective authors (see below). All rights reserved.
 * 
 * This library is free software; you can redistribute it and/or modify it under the 
 * terms of the GNU Lesser General Public License as published by the Free Software 
 * Foundation; either version 2.1 of the License, or (at your option) any later 
 * version. 
 * 
 * This library 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 Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License along 
 * with this library; if not, write to the Free Software Foundation, Inc., 
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 
 */

import java.util.concurrent.atomic.AtomicInteger;

/**
 * Counts numbers used by the statistics. Keeps track of current,
 * maximum and total numbers.
 * 
 * @author The Red5 Project (red5@osflash.org)
 * @author Joachim Bauch (jojo@struktur.de)
 */
public class StatisticsCounter {

	/** Current number. */
	private AtomicInteger current = new AtomicInteger();
	
	/** Total number. */
	private AtomicInteger total = new AtomicInteger();
	
	/** Maximum number. */
	private AtomicInteger max = new AtomicInteger();
	
	/**
	 * Increment statistics by one.
	 */
	public void increment() {
		total.incrementAndGet();
		max.compareAndSet(current.intValue(), current.incrementAndGet());
	}
	
	/**
	 * Decrement statistics by one.
	 */
	public void decrement() {
		current.decrementAndGet();
	}
	
	/**
	 * Get current number.
	 * 
	 * @return current number
	 */
	public int getCurrent() {
		return current.intValue();
	}
	
	/**
	 * Get total number.
	 * 
	 * @return total
	 */
	public int getTotal() {
		return total.intValue();
	}
	
	/**
	 * Get maximum number.
	 * 
	 * @return max
	 */
	public int getMax() {
		return max.intValue();
	}
	
}
