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/**
* @file llpacketring.h
* @brief definition of LLPacketRing class for implementing a resend,
* drop, or delay in packet transmissions
*
* $LicenseInfo:firstyear=2001&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* 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;
* version 2.1 of the License only.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#ifndef LL_LLPACKETRING_H
#define LL_LLPACKETRING_H
#include <queue>
#include "llhost.h"
#include "llpacketbuffer.h"
#include "llproxy.h"
#include "llthrottle.h"
#include "net.h"
class LLPacketRing
{
public:
LLPacketRing();
~LLPacketRing();
void cleanup();
void dropPackets(U32);
void setDropPercentage (F32 percent_to_drop);
void setUseInThrottle(const bool use_throttle);
void setUseOutThrottle(const bool use_throttle);
void setInBandwidth(const F32 bps);
void setOutBandwidth(const F32 bps);
S32 receivePacket (S32 socket, char *datap);
S32 receiveFromRing (S32 socket, char *datap);
bool sendPacket(int h_socket, char * send_buffer, S32 buf_size, LLHost host);
inline LLHost getLastSender();
inline LLHost getLastReceivingInterface();
S32 getAndResetActualInBits() { S32 bits = mActualBitsIn; mActualBitsIn = 0; return bits;}
S32 getAndResetActualOutBits() { S32 bits = mActualBitsOut; mActualBitsOut = 0; return bits;}
protected:
bool mUseInThrottle;
bool mUseOutThrottle;
// For simulating a lower-bandwidth connection - BPS
LLThrottle mInThrottle;
LLThrottle mOutThrottle;
S32 mActualBitsIn;
S32 mActualBitsOut;
S32 mMaxBufferLength; // How much data can we queue up before dropping data.
S32 mInBufferLength; // Current incoming buffer length
S32 mOutBufferLength; // Current outgoing buffer length
F32 mDropPercentage; // % of packets to drop
U32 mPacketsToDrop; // drop next n packets
std::queue<LLPacketBuffer *> mReceiveQueue;
std::queue<LLPacketBuffer *> mSendQueue;
LLHost mLastSender;
LLHost mLastReceivingIF;
private:
bool sendPacketImpl(int h_socket, const char * send_buffer, S32 buf_size, LLHost host);
};
inline LLHost LLPacketRing::getLastSender()
{
return mLastSender;
}
inline LLHost LLPacketRing::getLastReceivingInterface()
{
return mLastReceivingIF;
}
#endif
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