/** * @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 "llpacketbuffer.h" #include "llhost.h" #include "net.h" #include "llthrottle.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; }; inline LLHost LLPacketRing::getLastSender() { return mLastSender; } inline LLHost LLPacketRing::getLastReceivingInterface() { return mLastReceivingIF; } #endif