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/*
* Copyright (c) 2017-2019 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <hicn/transport/interfaces/statistics.h>
#include <protocols/raaqm_data_path.h>
#include <chrono>
namespace transport {
namespace protocol {
class IcnRateEstimator {
public:
using TimePoint = std::chrono::steady_clock::time_point;
using Microseconds = std::chrono::microseconds;
IcnRateEstimator(){};
virtual ~IcnRateEstimator(){};
virtual void onRttUpdate(double rtt){};
virtual void onDataReceived(int packetSize){};
virtual void onWindowIncrease(double winCurrent){};
virtual void onWindowDecrease(double winCurrent){};
virtual void onStart(){};
virtual void onDownloadFinished(){};
virtual void setObserver(interface::IcnObserver *observer) {
this->observer_ = observer;
};
interface::IcnObserver *observer_;
TimePoint start_time_;
TimePoint begin_batch_;
double base_alpha_;
double alpha_;
double estimation_;
int number_of_packets_;
// this boolean is to make sure at least one estimation of the BW is done
bool estimated_;
};
// A rate estimator RTT-based. Computes EWMA(WinSize)/EWMA(RTT)
class InterRttEstimator : public IcnRateEstimator {
public:
InterRttEstimator(double alpha_arg);
~InterRttEstimator();
void onRttUpdate(double rtt);
void onDataReceived(int packet_size) {
if (packet_size > this->max_packet_size_) {
this->max_packet_size_ = packet_size;
}
};
void onWindowIncrease(double win_current);
void onWindowDecrease(double win_current);
void onStart(){};
void onDownloadFinished(){};
// private: should be done by using getters
pthread_t *my_th_;
bool thread_is_running_;
double rtt_;
bool is_running_;
pthread_mutex_t mutex_;
double avg_rtt_;
double avg_win_;
int max_packet_size_;
double win_change_;
double win_current_;
};
// A rate estimator, Batching Packets based. Computes EWMA(WinSize)/EWMA(RTT)
class BatchingPacketsEstimator : public IcnRateEstimator {
public:
BatchingPacketsEstimator(double alpha_arg, int batchingParam);
void onRttUpdate(double rtt);
void onDataReceived(int packet_size) {
if (packet_size > this->max_packet_size_) {
this->max_packet_size_ = packet_size;
}
};
void onWindowIncrease(double win_current);
void onWindowDecrease(double win_current);
void onStart(){};
void onDownloadFinished(){};
private:
int batching_param_;
double avg_rtt_;
double avg_win_;
double win_change_;
int max_packet_size_;
double win_current_;
};
// Segment Estimator
class ALaTcpEstimator : public IcnRateEstimator {
public:
ALaTcpEstimator();
void onDataReceived(int packet_size);
void onStart();
void onDownloadFinished();
private:
double totalSize_;
};
// A Rate estimator, this one is the simplest: counting batching_param_ packets
// and then divide the sum of the size of these packets by the time taken to DL
// them. Should be the one used
class SimpleEstimator : public IcnRateEstimator {
public:
SimpleEstimator(double alpha, int batching_param);
void onRttUpdate(double rtt);
void onDataReceived(int packet_size);
void onWindowIncrease(double win_current){};
void onWindowDecrease(double win_current){};
void onStart();
void onDownloadFinished();
private:
int batching_param_;
double total_size_;
};
void *Timer(void *data);
} // namespace protocol
} // end namespace transport
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