/**
* 获取一个自动分配的序号(注册服务器用)
*
* @return int|false
*/
public static function getNewHostId($group = 'default')
{
if (!self::$isRegisterServer) {
throw new \Exception('function Host::getNewHostId() only run by register server.');
}
while (true) {
# 获取一个自增ID
$id = self::$groupIdTable->incr($group, 'id');
if (false === $id) {
return false;
} else {
$id--;
if (self::$table->exist("{$group}_{$id}")) {
# 已经存在
continue;
} else {
return $id;
}
}
}
return false;
}
/**
* 原子自减操作，可用于整形或浮点型列
*
* @param $key
* @param $column
* @param $decrby
* @return bool|int
*/
function decr($key, $column, $decrby = 1)
{
if ($this->_link) {
$rs = parent::incr($key, $column, $decrby);
if (false === $rs) {
return false;
}
if (false === $this->_driverSet($key, [$column => $rs])) {
# 重试
usleep(300);
$this->_driverSet($key, [$column => $rs]);
}
return $rs;
} else {
return parent::decr($key, $column, $decrby);
}
}