/*
 *        JacORB - a free Java ORB
 *
 *   Copyright (C) 1997-2004 Gerald Brose.
 *
 *   This library is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU Library General Public
 *   License as published by the Free Software Foundation; either
 *   version 2 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
 *   Library General Public License for more details.
 *
 *   You should have received a copy of the GNU Library General Public
 *   License along with this library; if not, write to the Free
 *   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

package org.jacorb.orb.giop;

/**
 * @author Nicolas Noffke
 * @version $Id: LFUStatisticsProviderImpl.java,v 1.5 2006-06-28 12:41:43 alphonse.bendt Exp $
 */
public class LFUStatisticsProviderImpl
    implements StatisticsProvider
{
    private final long lifetime_begin;
    private long invocations = 0;

    public LFUStatisticsProviderImpl()
    {
        lifetime_begin = System.currentTimeMillis();
    }

    /**
     * A message chunk with the given size has been sent over the associated
     * Transport.
     */
    public void messageChunkSent( int size )
    {
        // no operation
    }

    /**
     * The transport has been flushed. This means that sending of a
     * message is complete.
     */
    public void flushed()
    {
        ++invocations;
    }

    /**
     * A message with the given size has been received by the
     * associated Transport.
     */
    public void messageReceived( int size )
    {
        ++invocations;
    }

    public double getFrequency()
    {
        double lifetime = System.currentTimeMillis() - lifetime_begin;
        return invocations / lifetime;
    }
}
