mirror of
https://github.com/ntop/ntopng.git
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77 lines
2.2 KiB
C++
77 lines
2.2 KiB
C++
/*
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*
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* (C) 2013-25 - ntop.org
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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#ifndef _DES_COUNTER_H_
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#define _DES_COUNTER_H_
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#include "ntop_includes.h"
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/* ************************ */
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/* Counter based on Double Exponential smoothing algorithm */
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class DESCounter : public BehaviouralCounter {
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private:
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struct ndpi_des_struct des;
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public:
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DESCounter(double alpha = 0.9, double beta = 0.035, float significance = 0.05)
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: BehaviouralCounter() {
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if (ndpi_des_init(&des, alpha, beta, significance) != 0)
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throw "Error while creating DES";
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}
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DESCounter(struct ndpi_des_struct *_des) {
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memcpy(&des, _des, sizeof(struct ndpi_des_struct));
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}
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bool addObservation(u_int64_t value) {
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double forecast, confidence_band;
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bool rc =
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(ndpi_des_add_value(&des, value, &forecast, &confidence_band) == 1)
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? true
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: false;
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double l_forecast = forecast - confidence_band;
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double h_forecast = forecast + confidence_band;
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last_value = value;
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last_lower = (u_int64_t)floor(((l_forecast < 0) ? 0 : l_forecast));
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last_upper = (u_int64_t)round(h_forecast + 0.5);
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if (rc) {
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is_anomaly =
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((value < last_lower) || (value > last_upper)) ? true : false;
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if (is_anomaly) tot_num_anomalies++;
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return (is_anomaly);
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}
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return (rc);
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}
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inline void resetStats() { ndpi_des_reset(&des); }
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inline DESCounter *clone() { return (new (std::nothrow) DESCounter(&des)); }
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inline void set(DESCounter *c) {
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memcpy(&des, &c->des, sizeof(struct ndpi_des_struct));
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}
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};
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#endif /* _DES_COUNTER_H_ */
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