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#include "rate-estimator.h"
#include <math.h>
RateEstimator::RateEstimator(): k_(0.1), estRate_(0.0), bytesArr_(0.0), temp_size_(0) {
prevTime_ = Scheduler::instance().clock();
reset_time_ = Scheduler::instance().clock();
}
RateEstimator::RateEstimator(double estimate): k_(0.1), bytesArr_(0.0), temp_size_(0) {
prevTime_ = Scheduler::instance().clock();
reset_time_ = Scheduler::instance().clock();
estRate_ = estimate;
}
void
RateEstimator::estimateRate(Packet * pkt) {
hdr_cmn* hdr = HDR_CMN(pkt);
bytesArr_+= hdr->size();
int pktSize = hdr->size() << 3; /* length of the packet in bits */
double now = Scheduler::instance().clock();
double timeGap = ( now - prevTime_);
if (timeGap == 0) {
temp_size_ += pktSize;
return;
}
else {
pktSize+= temp_size_;
temp_size_ = 0;
}
prevTime_ = now;
estRate_ = (1 - exp(-timeGap/k_))*((double)pktSize)/timeGap + exp(-timeGap/k_)*estRate_;
}
void
RateEstimator::reset() {
reset_time_ = Scheduler::instance().clock();
bytesArr_ = 0;
//shoule the rate estimate be reset?
// estRate_=0.0;
// prevTime_= Scheduler::instance().clock();
// temp_size_=0;
}
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