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Java NIO framework
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/*
 * Copyright (C) 2013 Sergey Zubarev, [email protected]
 *
 * This file is a part of JS-Collider framework.
 *
 * 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 Affero 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 .
 */

package org.jsl.collider;

import java.util.concurrent.atomic.AtomicLongArray;

public class StatCounter
{
    /* 0 - min
     * 1 - avg
     * 2 - max
     * 3 - sum
     */
    private final String m_name;
    private final AtomicLongArray m_data;

    public StatCounter( String name )
    {
        m_name = name;
        m_data = new AtomicLongArray(4);
        m_data.set( 0, Long.MAX_VALUE );
    }

    public final void trace( final long value )
    {
        for (;;)
        {
            long min = m_data.get(0);
            if (value >= min)
                break;
            if (m_data.compareAndSet(0, min, value))
                break;
        }

        for (;;)
        {
            final long avg = m_data.get(1);
            long cnt = (avg >> 32);
            long newAvg = cnt * (avg & 0xFFFFFFFFL) + value;
            cnt++;
            newAvg /= cnt;
            newAvg &= 0xFFFFFFFFL;
            newAvg |= (cnt << 32);
            if (m_data.compareAndSet(1, avg, newAvg))
                break;
        }

        for (;;)
        {
            long max = m_data.get(2);
            if (value <= max)
                break;
            if (m_data.compareAndSet(2, max, value))
                break;
        }

        for (;;)
        {
            long total = m_data.get(3);
            if (m_data.compareAndSet(3, total, total+value))
                break;
        }
    }

    public final String getStats()
    {
        String str = m_name;
        str += ": min=" + m_data.get(0);
        str += " avg=" + (m_data.get(1) & 0xFFFFFFFFL);
        str += " max=" + m_data.get(2);
        str += " sum=" + m_data.get(3);
        str += " cnt=" + (m_data.get(1) >> 32);
        return str;
    }
}