transmission/libtransmission/history.h

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/*
* This file Copyright (C) 2010-2014 Mnemosyne LLC
*
* It may be used under the GNU Public License v2 or v3 licenses,
* or any future license endorsed by Mnemosyne LLC.
*
* $Id$
*/
#ifndef __TRANSMISSION__
#error only libtransmission should #include this header.
#endif
#ifndef TR_RECENT_HISTORY_H
#define TR_RECENT_HISTORY_H
/**
* A generic short-term memory object that remembers how many times
* something happened over the last N seconds.
*
* For example, it could count how many are bytes transferred
* to estimate the speed over the last N seconds.
*/
enum
{
TR_RECENT_HISTORY_PERIOD_SEC = 60
};
typedef struct tr_recentHistory
{
/* these are PRIVATE IMPLEMENTATION details included for composition only.
* Don't access these directly! */
int newest;
struct {
unsigned int n;
time_t date;
} slices[TR_RECENT_HISTORY_PERIOD_SEC];
}
tr_recentHistory;
/**
* @brief add a counter to the recent history object.
* @param when the current time in sec, such as from tr_time ()
* @param n how many items to add to the history's counter
*/
void tr_historyAdd (tr_recentHistory *, time_t when, unsigned int n);
/**
* @brief count how many events have occurred in the last N seconds.
* @param when the current time in sec, such as from tr_time ()
* @param seconds how many seconds to count back through.
*/
unsigned int tr_historyGet (const tr_recentHistory *, time_t when, unsigned int seconds);
#endif