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/**
* @file llthrottle.h
* @brief LLThrottle class used for network bandwidth control
*
* $LicenseInfo:firstyear=2001&license=viewerlgpl$
* 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_LLTHROTTLE_H
#define LL_LLTHROTTLE_H
#include "lltimer.h"
const S32 MAX_THROTTLE_SIZE = 32;
class LLDataPacker;
// Single instance of a generic throttle
class LLThrottle
{
public:
LLThrottle(const F32 throttle = 1.f);
~LLThrottle() { }
void setRate(const F32 rate);
bool checkOverflow(const F32 amount); // I'm about to add an amount, TRUE if would overflow throttle
bool throttleOverflow(const F32 amount); // I just sent amount, TRUE if that overflowed the throttle
F32 getAvailable(); // Return the available bits
F32 getRate() const { return mRate; }
private:
F32 mLookaheadSecs; // Seconds to look ahead, maximum
F32 mRate; // BPS available, dynamically adjusted
F32 mAvailable; // Bits available to send right now on each channel
F64Seconds mLastSendTime; // Time since last send on this channel
};
typedef enum e_throttle_categories
{
TC_RESEND,
TC_LAND,
TC_WIND,
TC_CLOUD,
TC_TASK,
TC_TEXTURE,
TC_ASSET,
TC_EOF
} EThrottleCats;
class LLThrottleGroup
{
public:
LLThrottleGroup();
~LLThrottleGroup() { }
void resetDynamicAdjust();
bool checkOverflow(S32 throttle_cat, F32 bits); // I'm about to send bits, TRUE if would overflow channel
bool throttleOverflow(S32 throttle_cat, F32 bits); // I just sent bits, TRUE if that overflowed the channel
bool dynamicAdjust(); // Shift bandwidth from idle channels to busy channels, TRUE if adjustment occurred
bool setNominalBPS(F32* throttle_vec); // TRUE if any value was different, resets adjustment system if was different
S32 getAvailable(S32 throttle_cat); // Return bits available in the channel
void packThrottle(LLDataPacker &dp) const;
void unpackThrottle(LLDataPacker &dp);
public:
F32 mThrottleTotal[TC_EOF]; // BPS available, sent by viewer, sum for all simulators
protected:
F32 mNominalBPS[TC_EOF]; // BPS available, adjusted to be just this simulator
F32 mCurrentBPS[TC_EOF]; // BPS available, dynamically adjusted
F32 mBitsAvailable[TC_EOF]; // Bits available to send right now on each channel
F32 mBitsSentThisPeriod[TC_EOF]; // Sent in this dynamic allocation period
F32 mBitsSentHistory[TC_EOF]; // Sent before this dynamic allocation period, adjusted to one period length
F64Seconds mLastSendTime[TC_EOF]; // Time since last send on this channel
F64Seconds mDynamicAdjustTime; // Only dynamic adjust every 2 seconds or so.
};
#endif
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