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/*
** ZABBIX
** Copyright (C) 2000-2005 SIA Zabbix
**
** 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., 675 Mass Ave, Cambridge, MA 02139, USA.
**/
#include "common.h"
#include "db.h"
#include "log.h"
#include "zlog.h"
#include "threads.h"
#include "dbcache.h"
#include "dbsyncer.h"
/******************************************************************************
* *
* Function: main_dbsyncer_loop *
* *
* Purpose: periodically syncronises data in memory cache with database *
* *
* Parameters: *
* *
* Return value: *
* *
* Author: Alexei Vladishev *
* *
* Comments: never returns *
* *
******************************************************************************/
int main_dbsyncer_loop()
{
int now, sleeptime, last_sleeptime = -1, num;
double sec;
int retry_up = 0, retry_dn = 0;
zabbix_log(LOG_LEVEL_DEBUG, "In main_dbsyncer_loop()");
zbx_setproctitle("db syncer [connecting to the database]");
DBconnect(ZBX_DB_CONNECT_NORMAL);
for (;;) {
zabbix_log(LOG_LEVEL_DEBUG, "Syncing ...");
now = time(NULL);
sec = zbx_time();
num = DCsync_history(ZBX_SYNC_PARTIAL);
sec = zbx_time() - sec;
if (last_sleeptime == -1)
{
sleeptime = num ? ZBX_SYNC_MAX / num : CONFIG_DBSYNCER_FREQUENCY;
}
else
{
sleeptime = last_sleeptime;
if (num > ZBX_SYNC_MAX)
{
retry_up = 0;
retry_dn++;
}
else if (num < ZBX_SYNC_MAX / 2)
{
retry_up++;
retry_dn = 0;
}
else
retry_up = retry_dn = 0;
if (retry_dn >= 3)
{
sleeptime--;
retry_dn = 0;
}
if (retry_up >= 3)
{
sleeptime++;
retry_up = 0;
}
}
if (sleeptime < 0)
sleeptime = 0;
else if (sleeptime > CONFIG_DBSYNCER_FREQUENCY)
sleeptime = CONFIG_DBSYNCER_FREQUENCY;
last_sleeptime = sleeptime;
zabbix_log(LOG_LEVEL_DEBUG, "DB syncer spent " ZBX_FS_DBL " second while processing %d items. "
"Nextsync after %d sec.",
sec,
num,
sleeptime);
if (sleeptime > 0) {
zbx_setproctitle("db syncer [sleeping for %d seconds]",
sleeptime);
sleep(sleeptime);
}
}
DBclose();
}
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