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/*
* Copyright (C) 2009-2012 Jacek Sieka, arnetheduck on gmail point com
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#pragma once
#include "Singleton.h"
#include "Socket.h"
#include "TimerManager.h"
#include "SettingsManager.h"
namespace dcpp
{
/**
* Manager for throttling traffic flow.
* Inspired by Token Bucket algorithm: https://en.wikipedia.org/wiki/Token_bucket
*/
class ThrottleManager :
public Singleton<ThrottleManager>, private TimerManagerListener
{
public:
/*
* Throttles traffic and reads a packet from the network
*/
int read(Socket* sock, void* buffer, size_t len);
/*
* Throttles traffic and writes a packet to the network
* Handle this a little bit differently than downloads due to OpenSSL stupidity
*/
int write(Socket* sock, void* buffer, size_t& len);
void shutdown();
static SettingsManager::IntSetting getCurSetting(SettingsManager::IntSetting setting);
static int getUpLimit();
static int getDownLimit();
static void setSetting(SettingsManager::IntSetting setting, int value);
private:
// stack up throttled read & write threads
CriticalSection stateCS;
CriticalSection waitCS[2];
long activeWaiter;
#ifndef _WIN32
// shutdown wait
CriticalSection shutdownCS;
long n_lock, halt;
#endif
// download limiter
CriticalSection downCS;
int64_t downTokens;
// upload limiter
CriticalSection upCS;
int64_t upTokens;
friend class Singleton<ThrottleManager>;
ThrottleManager() : activeWaiter(-1), downTokens(0), upTokens(0)
{
#ifndef _WIN32
n_lock = halt = 0;
#endif
TimerManager::getInstance()->addListener(this);
}
virtual ~ThrottleManager();
bool getCurThrottling();
void waitToken();
// TimerManagerListener
void on(TimerManagerListener::Second, uint64_t /* aTick */) noexcept;
};
} // namespace dcpp
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