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/*
IMMS: Intelligent Multimedia Management System
Copyright (C) 2001-2009 Michael Grigoriev
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifndef __CORRELATE_H
#define __CORRELATE_H
#include <sys/time.h>
#include <string>
#include <vector>
#include <climits>
#include "immsconf.h"
#include "basicdb.h"
using std::string;
class CorrelationDb : virtual public BasicDb
{
public:
CorrelationDb();
float correlate(int sid1, int sid2);
void add_recent(int uid, time_t skipped_at, int flags);
void clear_recent() { expire_recent(INT_MAX); }
void expire_recent(time_t cutoff);
void maybe_expire_recent();
protected:
void update_correlation(int from, int to, float weight);
void expire_recent_helper();
void update_secondary_correlations(int from, int to, float outer);
void get_related(std::vector<int> &out, int pivot_sid, int limit);
virtual void sql_create_tables();
virtual void sql_schema_upgrade(int from = 0) {}
private:
// shared within callbacks
time_t correlate_from;
int from, from_weight, to, to_weight;
float weight;
struct timeval start;
};
#endif
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