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/*
* libjingle
* Copyright 2004--2005, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef TALK_BASE_NETWORK_H__
#define TALK_BASE_NETWORK_H__
#include <deque>
#include <map>
#include <string>
#include <vector>
#include "talk/base/basictypes.h"
namespace talk_base {
class Network;
class NetworkSession;
// Keeps track of the available network interfaces over time so that quality
// information can be aggregated and recorded.
class NetworkManager {
public:
// Updates and returns the current list of networks available on this machine.
// This version will make sure that repeated calls return the same object for
// a given network, so that quality is tracked appropriately.
void GetNetworks(std::vector<Network*>& networks);
// Reads and writes the state of the quality database in a string format.
std::string GetState();
void SetState(std::string str);
// Creates a network object for each network available on the machine.
static void CreateNetworks(std::vector<Network*>& networks);
private:
typedef std::map<std::string,Network*> NetworkMap;
NetworkMap networks_;
};
// Represents a Unix-type network interface, with a name and single address.
// It also includes the ability to track and estimate quality.
class Network {
public:
Network(const std::string& name, uint32 ip);
// Returns the OS name of this network. This is considered the primary key
// that identifies each network.
const std::string& name() const { return name_; }
// Identifies the current IP address used by this network.
uint32 ip() const { return ip_; }
void set_ip(uint32 ip) { ip_ = ip; }
// Updates the list of sessions that are ongoing.
void StartSession(NetworkSession* session);
void StopSession(NetworkSession* session);
// Re-computes the estimate of near-future quality based on the information
// as of this exact moment.
void EstimateQuality();
// Returns the current estimate of the near-future quality of connections
// that use this local interface.
double quality() { return quality_; }
// Debugging description of this network
std::string ToString() const;
private:
typedef std::vector<NetworkSession*> SessionList;
std::string name_;
uint32 ip_;
SessionList sessions_;
double uniform_numerator_;
double uniform_denominator_;
double exponential_numerator_;
double exponential_denominator_;
uint32 last_data_time_;
double quality_;
// Updates the statistics maintained to include the given estimate.
void AddDataPoint(uint32 time, double quality);
// Converts the internal state to and from a string. This is used to record
// quality information into a permanent store.
void SetState(std::string str);
std::string GetState();
friend class NetworkManager;
};
// Represents a session that is in progress using a particular network and can
// provide data about the quality of the network at any given moment.
class NetworkSession {
public:
// Determines whether this session has an estimate at this moment. We will
// only call GetCurrentQuality when this returns true.
virtual bool HasQuality() = 0;
// Returns an estimate of the quality at this exact moment. The result should
// be a MOS (mean opinion score) value.
virtual float GetCurrentQuality() = 0;
};
const double QUALITY_BAD = 3.0;
const double QUALITY_FAIR = 3.35;
const double QUALITY_GOOD = 3.7;
} // namespace talk_base
#endif // TALK_BASE_NETWORK_H__
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