}
// Start transaction before lock tables.
Database::beginTransaction();
// Pick next awaiting process
Database::locKTables([FRAMEWORK_COLLECTION_PROCESS . ' READ']);
$res = (int) Database::fetchField('SELECT IFNULL(SUM(`capacity`), 0) as occupation
FROM `' . FRAMEWORK_COLLECTION_PROCESS . '`
WHERE `pid` IS NOT NULL AND `pid` > 0');
Database::unlockTables(true);
if ($res >= $capLimit) {
Log::debug('Active processes has occupied maximum server capacity, daemon exits.');
Database::rollback();
die;
}
unset($res, $capLimit);
Database::lockTables(array(FRAMEWORK_COLLECTION_PROCESS . ' LOW_PRIORITY WRITE', FRAMEWORK_COLLECTION_PROCESS . ' as `active` LOW_PRIORITY WRITE', FRAMEWORK_COLLECTION_PROCESS . ' as `inactive` LOW_PRIORITY WRITE'));
$process = Database::fetchRow('SELECT `inactive`.* FROM `' . FRAMEWORK_COLLECTION_PROCESS . '` as `inactive`
LEFT JOIN ( SELECT `type`, SUM(`capacity`) as `occupation` FROM `' . FRAMEWORK_COLLECTION_PROCESS . '`
WHERE `pid` IS NOT NULL GROUP BY `type` ) as `active`
ON `active`.`type` = `inactive`.`type`
WHERE `timestamp` <= CURRENT_TIMESTAMP
AND `start_time` <= CURRENT_TIMESTAMP
AND `inactive`.`pid` IS NULL
ORDER BY `occupation`, `weight` DESC, `id`
LIMIT 1;');
// No waiting jobs in queue.
if (!$process) {
Database::unlockTables(true);
Database::rollback();
Log::debug('No more jobs to do, suicide.');
die;
/**
* Updates process related info of specified property $name.
*
* Note: Updates to real table properties are ignored, as they are requried
* by the process framework.
*/
public static function set($name, $value)
{
Database::lockTables(FRAMEWORK_COLLECTION_PROCESS, FRAMEWORK_COLLECTION_LOG);
$res = self::get();
if (!$res) {
Database::unlockTables();
return false;
}
$readOnlyFields = ['id', 'command', 'type', 'weight', 'pid', 'timestamp'];
if (in_array($name, $readOnlyFields)) {
Database::unlockTables();
return false;
}
if (is_null($value)) {
unset($res[$name]);
} else {
$res[$name] = $value;
}
unset($res['timestamp']);
$ret = Node::set($res);
Database::unlockTables();
// Clear data cache
self::$_processData = null;
return $ret;
}
