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/*
* Copyright (c) Contributors, http://opensimulator.org/
* See CONTRIBUTORS.TXT for a full list of copyright holders.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the OpenSim Project nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
namespace OpenSim.Region.ClientStack.LindenUDP
{
public class LLPacketThrottle
{
private readonly int m_maxAllowableThrottle;
private readonly int m_minAllowableThrottle;
private int m_currentThrottle;
private const int m_throttleTimeDivisor = 7;
private int m_currentBitsSent;
private int m_throttleBits;
/// <value>
/// Value with which to multiply all the throttle fields
/// </value>
private float m_throttleMultiplier;
public int Max
{
get { return m_maxAllowableThrottle; }
}
public int Min
{
get { return m_minAllowableThrottle; }
}
public int Current
{
get { return m_currentThrottle; }
}
/// <summary>
/// Constructor.
/// </summary>
/// <param name="min"></param>
/// <param name="max"></param>
/// <param name="throttle"></param>
/// <param name="throttleMultiplier">
/// A parameter that's ends up multiplying all throttle settings. An alternative solution would have been
/// to multiply all the parameters by this before giving them to the constructor. But doing it this way
/// represents the fact that the multiplier is a hack that pumps data to clients much faster than the actual
/// settings that we are given.
/// </param>
public LLPacketThrottle(int min, int max, int throttle, float throttleMultiplier)
{
m_throttleMultiplier = throttleMultiplier;
m_maxAllowableThrottle = max;
m_minAllowableThrottle = min;
m_currentThrottle = throttle;
m_currentBitsSent = 0;
CalcBits();
}
/// <summary>
/// Calculate the actual throttle required.
/// </summary>
private void CalcBits()
{
m_throttleBits = (int)((float)m_currentThrottle * m_throttleMultiplier / (float)m_throttleTimeDivisor);
}
public void Reset()
{
m_currentBitsSent = 0;
}
public bool UnderLimit()
{
return m_currentBitsSent < m_throttleBits;
}
public int AddBytes(int bytes)
{
m_currentBitsSent += bytes * 8;
return m_currentBitsSent;
}
public int Throttle
{
get { return m_currentThrottle; }
set
{
if (value < m_minAllowableThrottle)
{
m_currentThrottle = m_minAllowableThrottle;
}
else if (value > m_maxAllowableThrottle)
{
m_currentThrottle = m_maxAllowableThrottle;
}
else
{
m_currentThrottle = value;
}
CalcBits();
}
}
}
}
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