public function getShardInfo()
{
if (empty(self::$_virtShards)) {
$vsconfig = (require _CONFIG_ . DIRECTORY_SEPARATOR . 'shard.php');
$this->_vsconfig = $vsconfig;
$infokey = $vsconfig['infokey'];
$info_uptime_key = $infokey . '_uptime';
$redis = Leb_Dao_Redis::getInstance($vsconfig['redis']);
// TODO 远程读取redis缓存的速度，和$value的大小关系非常大。
// 所以还可以考虑把$value值压缩后存储，能从redis读取的时候快些。
// 存储在本地磁盘还是快些，可以考虑再加一层缓存，
// 通过本地更新时间与redis更新时间确定是否需要拿数据库新值。
$vsinfos = array();
if (($gz_jvsdata = $redis->get($infokey)) !== false) {
$jvsdata = gzuncompress($gz_jvsdata);
if ($jvsdata === false) {
$vsinfos = json_decode($gz_jvsdata, true);
if ($vsinfos) {
$redis->set($infokey, gzcompress($gz_jvsdata));
} else {
$this->_error = 'Unknown shard info cache format, no json, no gzjson.';
}
} else {
$vsinfos = json_decode($jvsdata, true);
}
} else {
$dbConfig = $vsconfig['database'];
$dbh = Leb_Dao_Abstract::getInstance($dbConfig);
if (!$dbh) {
return false;
} else {
$sql = "SELECT * FROM `{$vsconfig['tablename']}` LIMIT 4096";
$vsrecords = $dbh->query($sql);
if (!$vsrecords) {
$dbh = null;
return false;
} else {
foreach ($vsrecords as $idx => $record) {
$vsinfos['byid'][$record['vsid']] = $record;
$bynameKey = "{$record['shard_name']}_{$record['shard_value']}";
$vsinfos['byname'][$bynameKey][$record['vsid']] = $record;
$vsinfos['uptime'] = time();
}
$bret = $redis->set($infokey, gzcompress(json_encode($vsinfos)));
$bret = $redis->set($info_uptime_key, $vsinfos['uptime']);
}
}
}
if (!empty($vsinfos)) {
self::$_virtShards = $vsinfos;
}
}
return self::$_virtShards;
}
/**
* 对保存到数据库的数据进行处理
*
* @param mixed $data 要操作的数据
* @return boolean
*/
protected function _facade($data)
{
$this->_checkTableInfo();
$data = Leb_Dao_Abstract::facade($data, $this->_fields, self::$dbFieldtypeCheck);
$this->_before_write($data);
return $data;
}
