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/**
* @file llthrottle.h
* @brief LLThrottle class used for network bandwidth control
*
* $LicenseInfo:firstyear=2001&license=viewergpl$
*
* Copyright (c) 2001-2009, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#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
F64 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
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
F64 mLastSendTime[TC_EOF]; // Time since last send on this channel
F64 mDynamicAdjustTime; // Only dynamic adjust every 2 seconds or so.
};
#endif
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