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/*
* Copyright (c) 2021 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/utils/chrono_typedefs.h>
#include <utils/min_filter.h>
#include <chrono>
#include <climits>
#include <iostream>
#define TIMEOUT_SMOOTHER 0.1
#define TIMEOUT_RATIO 10
#define ALPHA 0.8
namespace transport {
namespace protocol {
class RaaqmDataPath {
public:
RaaqmDataPath(double drop_factor, double minimum_drop_probability,
unsigned new_timer, unsigned int samples,
const utils::SteadyTime::Milliseconds &new_rtt =
utils::SteadyTime::Milliseconds(1000),
const utils::SteadyTime::Milliseconds &new_rtt_min =
utils::SteadyTime::Milliseconds(1000),
const utils::SteadyTime::Milliseconds &new_rtt_max =
utils::SteadyTime::Milliseconds(1000),
unsigned new_pd = UINT_MAX);
public:
/*
* @brief Add a new RTT to the RTT queue of the path, check if RTT queue is
* full, and thus need overwrite. Also it maintains the validity of min and
* max of RTT.
* @param new_rtt is the value of the new RTT
*/
RaaqmDataPath &insertNewRtt(const utils::SteadyTime::Microseconds &new_rtt,
const utils::SteadyTime::TimePoint &now);
/**
* @brief Update the path statistics
* @param packet_size the size of the packet received, including the ICN
* header
* @param data_size the size of the data received, without the ICN header
*/
RaaqmDataPath &updateReceivedStats(std::size_t packet_size,
std::size_t data_size);
/**
* @brief Get the value of the drop factor parameter
*/
double getDropFactor();
/**
* @brief Get the value of the drop probability
*/
double getDropProb();
/**
* @brief Set the value pf the drop probability
* @param drop_prob is the value of the drop probability
*/
RaaqmDataPath &setDropProb(double drop_prob);
/**
* @brief Get the minimum drop probability
*/
double getMinimumDropProbability();
/**
* @brief Get last RTT
*/
double getRtt();
/**
* @brief Get average RTT
*/
double getAverageRtt();
/**
* @brief Get the current m_timer value
*/
double getTimer();
/**
* @brief Smooth he value of the m_timer accordingly with the last RTT
* measured
*/
RaaqmDataPath &smoothTimer();
/**
* @brief Get the maximum RTT among the last samples
*/
double getRttMax();
/**
* @brief Get the minimum RTT among the last samples
*/
double getRttMin();
/**
* @brief Get the number of saved samples
*/
unsigned getSampleValue();
/**
* @brief Get the size og the RTT queue
*/
unsigned getRttQueueSize();
/*
* @brief Change drop probability according to RTT statistics
* Invoked in RAAQM(), before control window size update.
*/
RaaqmDataPath &updateDropProb();
void setAlpha(double alpha);
/**
* @brief Returns the smallest RTT registered so far for this path
*/
unsigned int getPropagationDelay();
bool newPropagationDelayAvailable();
bool isStale();
private:
/**
* The value of the drop factor
*/
double drop_factor_;
/**
* The minumum drop probability
*/
double minimum_drop_probability_;
/**
* The timer, expressed in milliseconds
*/
double timer_;
/**
* The number of samples to store for computing the protocol measurements
*/
const unsigned int samples_;
/**
* The last, the minimum and the maximum value of the RTT (among the last
* m_samples samples)
*/
uint64_t rtt_, rtt_min_, rtt_max_, prop_delay_;
bool new_prop_delay_;
/**
* The current drop probability
*/
double drop_prob_;
/**
* The number of packets received in this path
*/
intmax_t packets_received_;
/**
* The first packet received after the statistics print
*/
intmax_t last_packets_received_;
/**
* Total number of bytes received including the ICN header
*/
intmax_t m_packets_bytes_received_;
/**
* The amount of packet bytes received at the last path summary computation
*/
intmax_t last_packets_bytes_received_;
/**
* Total number of bytes received without including the ICN header
*/
intmax_t raw_data_bytes_received_;
/**
* The amount of raw dat bytes received at the last path summary computation
*/
intmax_t last_raw_data_bytes_received_;
class byArrival;
class byOrder;
/**
* Double ended queue for the RTTs
*/
typedef utils::MinFilter<uint64_t> RTTQueue;
RTTQueue rtt_samples_;
/**
* Time of the last call to the path reporter method
*/
utils::SteadyTime::TimePoint last_received_pkt_;
double average_rtt_;
double alpha_;
};
} // end namespace protocol
} // end namespace transport
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